Proximal bicep tendon rupture

1. High-Yield Summary

Proximal rupture of the long head of the biceps tendon (LHBT) is a frequent shoulder condition marked by the acute or insidious disruption of the tendon near its supraglenoid origin or within the bicipital groove. Clinical synthesis and surgical decision-making hinge on five core principles:

• Pathoanatomic Spectrum: Greater than 90% of proximal biceps ruptures represent end-stage attritional failures occurring in individuals older than 50 years on a foundation of chronic subacromial impingement, microvascular watershed ischemia, and repetitive mechanical friction. Acute traumatic ruptures in young athletes are uncommon and typically follow violent eccentric loading.
• Rotator Cuff and Pulley Association: Proximal biceps tendon rupture rarely happens in isolation; it coexists with rotator cuff tears (particularly involving the supraspinatus and subscapularis) and biceps pulley complex disruptions in 70% to 80% of clinical cases.
• The Auto-Tenotomy Phenomenon: Spontaneous rupture frequently produces sudden, paradoxical relief of longstanding anterior shoulder pain by decompressing the diseased tendon from the glenohumeral joint and bicipital groove, leaving the pathognomonic distal muscle retraction known as the Popeye deformity.
• Modest Functional Deficits: Because the short head of the biceps and the brachialis remain completely intact, long-term functional loss after nonoperative management is minimal, averaging an 8% to 10% reduction in elbow flexion torque and a 10% to 20% reduction in forearm supination torque.
• Algorithmic Treatment Stratification: Nonoperative functional rehabilitation is the established first-line treatment for the vast majority of older or low-demand patients. Operative management (tenodesis or tenotomy) is reserved for younger active laborers, athletes requiring supination endurance, patients with intolerable muscle cramping, or those undergoing concomitant rotator cuff repair.

2. Anatomy

A rigorous understanding of the gross, microvascular, and surgical anatomy of the proximal biceps tendon and its surrounding soft-tissue envelope is essential for accurate clinical evaluation and safe operative intervention.

Musculoskeletal Architecture and Pulley System

The long head of the biceps brachii tendon originates proximally from the supraglenoid tubercle (approximately 40% to 50% of fibers) and the posterior superior glenoid labrum (50% to 60% of fibers). The tendon courses intra-articularly for 2.5 to 3.0 cm across the superior aspect of the humeral head before angling approximately 30 to 40 degrees anteroinferiorly to enter the extra-articular intertubercular (bicipital) groove.

The bicipital groove is an osseous sulcus bounded laterally by the greater tuberosity and medially by the lesser tuberosity. The normal groove measures approximately 4 to 5 mm in depth, with a medial wall angle averaging 30 to 45 degrees. A shallow groove (depth under 3 mm) or a flat medial wall angle predisposes the tendon to medial subluxation or frank dislocation.

Stability of the tendon at the entrance of the bicipital groove depends critically on the biceps pulley complex (the rotator interval sling). This fibrous sling is formed by:

• Superior Glenohumeral Ligament (SGHL): Provides the primary medial and inferior stabilizing sling against medial tendon displacement.
• Coracohumeral Ligament (CHL): Envelopes the tendon with a lateral band inserting onto the greater tuberosity and a medial band inserting onto the lesser tuberosity.
• Subscapularis Tendon: The superior insertion of the subscapularis forms the deep floor and medial wall of the pulley sling.
• Supraspinatus Tendon: The anterior border of the supraspinatus tendon forms the superior roof of the pulley.

The transverse humeral ligament (Brodie’s ligament) spans the distal groove but represents an anatomical continuation of the subscapularis and pectoralis major tendinous fibers rather than an independent retaining structure.

Microvascular Watershed Zone and Blood Supply

The vascular supply of the proximal biceps tendon is dual in origin. Proximally, branches from the anterior circumflex humeral artery and the thoracoacromial artery supply the labral origin and intra-articular segment. Distally, muscular branches from the brachial artery supply the extra-articular segment via the myotendinous junction.

The arcuate artery of Laing, an ascending anterolateral branch of the anterior circumflex humeral artery, enters the bicipital groove and travels along the lateral aspect of the tendon, supplying both the humeral head and the proximal biceps. Between 1.2 cm and 3.0 cm distal to its glenoid origin—precisely where the tendon curves over the humeral head and enters the bicipital groove—exists a documented microvascular watershed zone. This critical hypovascular segment experiences maximal repetitive mechanical shear, compressive forces, and contact pressure, rendering it vulnerable to microtrauma, mucoid degeneration, and spontaneous rupture.

Neurovascular Danger Zones and Internervous Planes

Surgical access to the proximal biceps tendon requires strict adherence to anatomical danger zones:

• Musculocutaneous Nerve: Exits the lateral cord of the brachial plexus and enters the coracobrachialis muscle 3 to 8 cm distal to the tip of the coracoid process, before continuing into the interval between the biceps brachii and brachialis. During open subpectoral tenodesis or anterior shoulder exposures, excessive medial retraction on the conjoint tendon or deep dissection medial to the bicipital groove can cause traction neuropraxia or laceration.
• Axillary Nerve: Traverses the quadrangular space approximately 5 to 7 cm distal to the anterolateral acromion. During arthroscopic portal placement or low trans-tendon instrument passage, instruments must not stray inferior to the lower border of the subscapularis.
• Radial Nerve: Courses posterior to the humerus in the spiral groove; safe surgical margins are maintained during subpectoral tenodesis by keeping bicortical drills strictly in an anterior-to-posterior trajectory perpendicular to the humeral shaft.
• Surgical Internervous Planes: The classic deltopectoral approach utilizes the true internervous plane between the deltoid (axillary nerve) and the pectoralis major (medial and lateral pectoral nerves), preserving the cephalic vein. For mini-open subpectoral tenodesis, a 3-cm longitudinal incision is centered over the inferior border of the pectoralis major tendon insertion; dissection identifies the inferior border of the pectoralis major without entering intermuscular planes, remaining superficial to the conjoint tendon and brachialis.

3. Pathogenesis

The pathogenesis of proximal biceps tendon rupture is predominantly multifactorial, driven by intrinsic biological degeneration compounded by extrinsic biomechanical wear.

Intrinsic Degeneration and Watershed Hypoperfusion

Age-related hypoperfusion within the microvascular watershed zone initiates a cascade of histopathological degradation. Normal densely packed, parallel Type I collagen bundles undergo progressive disorientation, tenocyte apoptosis, and chondroid metaplasia. Extracellular matrix remodeling leads to accumulation of hydrophilic proteoglycans, lipid infiltration, and disorganized Type III collagen, characteristic of angiofibroblastic tendinosis. This weakened collagenous framework exhibits reduced tensile stiffness and lower ultimate failure load.

Extrinsic Biomechanical Friction and Groove Dynamics

During normal shoulder range of motion, the humeral head rotates beneath the relatively fixed long head of the biceps tendon, resulting in 1.5 to 2.5 cm of tendon excursion within the fibro-osseous bicipital groove. In shoulders affected by subacromial impingement, anterior acromial spurs, or hypertrophic bicipital groove osteophytes, this motion creates repetitive friction. Chronic stenosing tenosynovitis thickens the tendon, leading to an hourglass deformity or longitudinal interstitial delamination. The thickened tendon becomes mechanically entrapped at the groove entrance during glenohumeral motion.

Mechanisms of Failure: Attritional vs. Acute Traumatic

Two distinct failure patterns occur clinically:

• Chronic Attritional Rupture: Occurs in over 90% of cases, typically in individuals over 50 years of age. Progressive structural thinning culminates in spontaneous rupture during low-energy activities of daily living (such as lifting a bag of groceries or reaching overhead).
• Acute Traumatic Overload: Seen in younger athletes, manual laborers, or weightlifters. Rupture results from sudden, violent eccentric loading against a contracted biceps with the elbow flexed and the shoulder extended, driving tensile stresses beyond the ultimate strength of even relatively healthy tendon fibers.

Synergism with Rotator Cuff and Pulley Pathology

The proximal biceps tendon functions as a secondary stabilizer against anterior and superior humeral head translation, particularly in shoulders with rotator cuff insufficiency. When the supraspinatus or subscapularis tears, superior and anterior migration of the humeral head dramatically increases the shear stresses transmitted through the biceps pulley and LHBT. Tears of the subscapularis disrupt the medial pulley wall, allowing the biceps tendon to subluxate or dislocate medially over the lesser tuberosity. Medial dislocation subjects the tendon to severe mechanical friction against the osseous medial ridge, rapidly accelerating mechanical fraying and culminating in complete rupture.

4. Natural History

Ruptures of the proximal long head of the biceps tendon account for approximately 95% of all biceps tendon disruptions, whereas distal biceps ruptures represent 3% to 5%, and isolated short head ruptures occur in under 1%. The peak incidence occurs between 50 and 65 years of age, with a distinct male predominance (approximately 2:1 to 3:1) and involvement of the dominant extremity in over 60% of cases. Systemic risk factors include tobacco abuse, systemic corticosteroid therapy, fluoroquinolone exposure, diabetes mellitus, and chronic repetitive overhead labor.

The natural history of an untreated proximal biceps tendon rupture follows a remarkably predictable trajectory:

• Acute Phase (0 to 3 weeks): The sudden structural disruption produces sharp anterior shoulder pain, followed by distal migration of the tendon and variable ecchymosis descending down the anteromedial arm. Muscle spasm and cramping may occur in the retracted biceps muscle belly.
• Intermediate Phase (3 to 8 weeks): Acute inflammation and hematoma resolve. In many patients with preexisting subacromial or bicipital tendinopathy, this phase is marked by significant pain relief. Once the diseased intra-articular tendon stump retracts distally below the bicipital groove, the mechanical trigger of glenohumeral and sulcus impingement is eliminated—a process termed auto-tenotomy.
• Chronic Phase (Beyond 8 weeks): The retracted tendon scars down to adjacent soft tissues, typically the proximal humerus shaft or the overlying pectoralis major tendon sheath. The distal muscle belly remains retracted, creating a permanent cosmetic contour alteration (the Popeye deformity).

Objective functional outcome evaluations demonstrate that nonoperative management yields excellent clinical results in elderly and sedentary populations. Because the short head of the biceps brachii remains attached to the coracoid process, and the brachialis provides powerful elbow flexion while the supinator maintains forearm rotation, permanent functional deficits are minimal. Quantitative biomechanical evaluations document an average loss of 8% to 10% in elbow flexion peak torque and 10% to 20% in forearm supination torque. While these deficits are clinically imperceptible during regular daily activities, high-demand manual workers and overhead athletes may note rapid muscle fatigue or cramping during repetitive pronation-supination tasks (such as using a screwdriver).

5. Clinical Presentation

A systematic clinical examination distinguishes isolated proximal biceps ruptures from primary rotator cuff pathology, distal biceps avulsions, and complex labral tears.

History

Patients typically describe a long prodrome of anterior shoulder pain exacerbated by overhead reach, forward flexion, and rotational activities, often previously diagnosed as impingement syndrome or subacromial bursitis. The hallmark acute event is characterized by:

• A sudden, audible or palpable pop or snap in the anterior shoulder during lifting or pulling.
• Sharp initial pain localized over the bicipital groove that rapidly subsides over hours to days.
• A visible bulge or fullness in the distal third of the anterior arm, often noticed when flexing the elbow in front of a mirror.
• Extensive subcutaneous ecchymosis appearing within 24 to 48 hours, tracking down the medial and anterior arm toward the antecubital fossa under gravitational pull.
• Subsequent relief of preexisting deep shoulder pain, occasionally accompanied by episodic muscle spasms or fatigue during sustained elbow flexion.

Physical Examination

The physical examination should follow a structured sequence of inspection, palpation, and provocative testing:

• Visual Inspection: Side-by-side comparison reveals the classic Popeye sign (distal descent of the biceps muscle belly forming a prominent mass in the lower anterior arm, with a corresponding depression proximally). The deformity is accentuated by resisted active elbow flexion with the forearm in full supination.
• Palpation: Direct palpation of the intertubercular groove with the arm placed in 10 to 15 degrees of internal rotation typically reveals an empty groove sign, with localized tenderness over the sulcus or myotendinous junction.
• Ludington’s Test: The patient sits with both hands clasped behind the head and fingers interlaced. The examiner palpates both biceps muscle bellies while the patient contracts the biceps symmetrically. Absence of a palpable contraction or a soft, flattened proximal muscle contour confirms rupture of the long head on the affected side [Sensitivity: 85% to 90%, Specificity: 95% to 98%].
• Speed’s Test: The patient forward flexes the shoulder to 90 degrees with the elbow in full extension and the forearm fully supinated. The examiner applies a downward force while the patient resists. Pain localized strictly to the bicipital groove indicates bicipital inflammation or partial tear prior to complete disruption [Sensitivity: 53% to 68%, Specificity: 56% to 67%].
• Yergason’s Test: With the patient’s elbow flexed to 90 degrees and the forearm pronated against the trunk, the patient actively supinates and externally rotates against the examiner’s firm resistance while the examiner palpates the bicipital groove. Pain or a palpable pop indicates biceps tenosynovitis or transverse ligament/pulley instability [Sensitivity: 32% to 43%, Specificity: 79% to 92%].
• O’Brien’s Active Compression Test: The patient forward flexes the shoulder to 90 degrees with 10 to 15 degrees of horizontal adduction and full internal rotation (thumb pointed down). Downward pressure is applied and resisted. The test is repeated in full supination (thumb pointed up). Deep glenohumeral pain in internal rotation that is relieved or eliminated in supination indicates superior labral (SLAP) or biceps anchor pathology [Sensitivity: 63% to 88%, Specificity: 73% to 98%].
• Biceps Load II Test: The patient is positioned supine with the shoulder abducted to 120 degrees, externally rotated to maximum tolerance, elbow flexed to 90 degrees, and forearm supinated. The patient flexes the elbow against examiner resistance. Deep shoulder pain indicates superior labral biceps anchor avulsion [Sensitivity: 89% to 90%, Specificity: 96% to 97%].

6. Imaging and Diagnostic Studies

While complete proximal biceps tendon rupture is largely a clinical diagnosis based on history and physical exam, diagnostic imaging is essential to evaluate concomitant rotator cuff tears, assess bicipital groove morphology, and exclude bony avulsions or occult glenohumeral pathology.

Plain Radiography

A standard radiographic shoulder series includes a true anteroposterior (Grashey view), a scapular Y lateral view, and an axillary lateral view. Dedicated specialty projections provide valuable supplementary data:

• Fisk Tangential Bicipital Groove View: Obtained with the patient leaning forward over the cassette with the beam directed inferiorly along the long axis of the humerus. This view visualizes groove depth, medial wall slope angle, and the presence of marginal enthesophytes or osteochondral loose bodies within the sulcus.
• Radiographic Findings: Plain films assess acromial morphology (Bigliani classification), critical shoulder angle (CSA), acromiohumeral distance (AHD under 7 mm suggests chronic massive rotator cuff tear), and calcific deposits within the rotator interval or bicipital sheath.

Diagnostic Musculoskeletal Ultrasound

High-resolution musculoskeletal ultrasound (10 to 15 MHz linear array transducer) provides an accurate, cost-effective, real-time dynamic assessment of the long head of the biceps tendon:

• Transverse and Longitudinal Imaging: Visualizes the tendon from its intra-articular entrance down through the subpectoral region.
• Empty Sulcus Sign: Complete absence of the normal echogenic, fibrillar oval tendon within the fibro-osseous groove, replaced by anechoic or hypoechoic hematoma and fluid distension of the synovial sheath.
• Dynamic Testing: Passive and active elbow flexion and forearm rotation confirm lack of tendon excursion in the groove, identify the retracted myotendinous stump distally, and evaluate subscapularis tendon integrity with dynamic external rotation [Sensitivity: 88% to 96%, Specificity: 98% to 100% for full-thickness tears].

Magnetic Resonance Imaging (MRI)

Non-contrast MRI (or MR arthrography when subtle labral or partial pulley tears are suspected) represents the multiplanar gold standard for comprehensive assessment of the shoulder girdle:

• Axial T2-Weighted / Proton Density Fat-Suppressed Sequences: Demonstrate the pathognomonic empty bicipital groove sign. The normal low-signal oval tendon structure is absent from the sulcus and replaced by high T2 signal joint fluid or organizing hematoma.
• Coronal Oblique and Sagittal Sequences: Delineate the exact level of tendon disruption, the extent of distal stump retraction (often resting adjacent to or below the pectoralis major tendon insertion), and the degree of biceps muscle belly retraction.
• Rotator Cuff and Labral Evaluation: MRI meticulously assesses full-thickness supraspinatus, infraspinatus, and subscapularis tears, medial dislocation of the biceps into the subscapularis belly or glenohumeral joint, and muscle fatty infiltration using Goutallier staging on sagittal T1 cuts.

7. Classification

Pathology of the proximal biceps tendon and its stabilizing pulley complex is classified using validated anatomical systems that guide surgical reconstruction versus tenotomy.

Habermeyer Classification of Biceps Pulley Lesions

The Habermeyer classification categorizes lesions of the rotator interval pulley sling based on arthroscopic anatomical involvement of the superior glenohumeral ligament (SGHL), coracohumeral ligament (CHL), supraspinatus, and subscapularis:

Lafosse Arthroscopic Classification of Biceps Tendon Pathology

The Lafosse grading system stratifies macroscopic biceps tendon damage during diagnostic arthroscopy:

• Grade 0: Normal tendon with smooth synovial lining, uniform caliber, and normal stability within the bicipital groove.
• Grade 1 (Minor Lesion): Partial tendon fraying, tenosynovial hypertrophy, or vascular injection involving less than 50% of the tendon diameter. Managed with synovectomy or debridement.
• Grade 2 (Major Lesion): Severe structural compromise involving greater than 50% of tendon cross-sectional diameter, longitudinal splitting, delamination, hourglass hypertrophy, medial dislocation/subluxation, or complete rupture. Dictates formal surgical tenotomy or tenodesis.

8. Treatment

Management of proximal biceps tendon rupture requires individualized decision-making that balances patient age, functional demands, cosmetic expectations, and concomitant shoulder pathology.

Medical and Nonoperative Management

Nonoperative treatment represents the standard of care for over 80% of patients with proximal biceps ruptures, particularly those over 60 years of age, sedentary individuals, and patients with low cosmetic concern. The nonoperative rehabilitation protocol proceeds as follows:

• Immobilization and Protection (Days 1 to 7): Sling immobilization is maintained briefly for acute pain control and soft-tissue rest. Prolonged sling use is strictly discouraged to avoid glenohumeral capsular stiffness.
• Symptomatic Pharmacotherapy: Short courses of nonsteroidal anti-inflammatory drugs (NSAIDs) or acetaminophen combined with local cryotherapy manage acute inflammation and hematoma discomfort.
• Early Functional Range of Motion (Weeks 1 to 4): Immediate pendulum exercises, active-assisted elbow flexion and extension, and unrestricted forearm pronation-supination are initiated. Passive and active shoulder motion exercises are advanced as pain permits.
• Progressive Strengthening (Weeks 4 to 8): Progressive isometric and isotonic strengthening focuses on the brachialis and the intact short head of the biceps, alongside dedicated rotator cuff and periscapular stabilizer strengthening. Most patients achieve pain-free daily function within 6 to 8 weeks.

Operative Management

The primary goals of operative management are to eliminate muscle cramping, restore the physiological length-tension relationship of the biceps muscle belly, prevent or correct the Popeye cosmetic deformity, and optimize forearm supination endurance torque. Surgical techniques include:

• Arthroscopic Biceps Tenotomy: The residual proximal biceps stump is transected flush at the superior labral origin using an arthroscopic radiofrequency probe or basket punch, allowing the tendon to retract distally into the bicipital groove. Technical advantages include minimal operative time, immediate postoperative mobilization, elimination of hardware costs, and rapid pain relief. The primary drawbacks are a 25% to 45% incidence of visible Popeye deformity and a 15% to 20% incidence of early postoperative bicep cramping.
• Arthroscopic Suprapectoral Tenodesis: Performed within the high bicipital groove or rotator interval. The tendon is released from the labrum, retrieved, and secured within the proximal sulcus using a bioabsorbable or PEEK interference screw, all-suture anchor, or suture anchor construct. While avoiding a separate open incision, this technique leaves the distal bicipital groove segment within its sheath, which can result in persistent tenosynovitis in 10% to 15% of patients.
• Mini-Open Subpectoral Biceps Tenodesis: The established gold standard for anatomical tenodesis. A 3-cm longitudinal incision is made in the axillary fold centered over the inferior border of the pectoralis major tendon insertion. The biceps tendon is retrieved from beneath the pectoralis major, the diseased and degenerated intra-articular and intra-groove segments (typically proximal 2 to 3 cm) are resected, and the tendon is secured to the humerus using an interference screw, cortical button (biceps button), or dual suture anchors. This approach completely exteriorizes the tendon from the bicipital groove, eliminating groove tenosynovitis as a potential pain generator.

Indications and Contraindications

Explicit clinical and physiological thresholds dictate surgical selection:

• Absolute and Strong Relative Indications for Tenodesis:
  • Young, active patients (under 50 years of age) or heavy manual laborers whose vocations demand sustained forearm supination power and endurance.
  • Athletes and cosmetically sensitive individuals desiring prevention or correction of the Popeye muscle deformity.
  • Persistent, debilitating biceps muscle belly cramping or spasms that fail to resolve after 3 months of conservative management.
  • Concomitant symptomatic rotator cuff tears, subscapularis avulsions, or superior labral tears undergoing operative reconstruction where the biceps is tenodesed as an adjunct procedure.
• Contraindications to Operative Intervention:
  • Asymptomatic elderly, sedentary patients with baseline functional independence.
  • Active local cuticular infection or systemic sepsis.
  • Severe glenohumeral osteoarthritis or advanced rotator cuff arthropathy (unless planned in conjunction with reverse total shoulder arthroplasty).
  • Cognitive impairment or inability to comply with postoperative immobilization and lifting restrictions (limiting active elbow flexion for 6 weeks).

9. Outcome

Comparative clinical outcomes following nonoperative treatment, tenotomy, and tenodesis demonstrate high overall success, with distinct functional and cosmetic trade-offs.

Patient-Reported Outcome Measures (PROMs)

Validated scoring instruments—including the American Shoulder and Elbow Surgeons (ASES) score, Constant-Murley score, Western Ontario Rotator Cuff (WORC) index, and Disability of the Arm, Shoulder, and Hand (DASH) score—demonstrate no statistically significant difference between tenotomy and tenodesis across broad patient populations. Both operative cohorts achieve post-treatment ASES scores exceeding 85 to 90 points, reflecting excellent pain relief and restoration of daily shoulder function.

Objective Biomechanical and Strength Endpoints

Isokinetic and isometric dynamometer testing yields clear biomechanical patterns:

• Elbow Flexion Strength: Elbow flexion peak torque demonstrates negligible differences between tenotomy and tenodesis, with both groups recovering greater than 90% to 95% of the strength of the contralateral normal arm.
• Forearm Supination Strength and Endurance: Tenodesis provides superior forearm supination peak torque and fatigue endurance compared to tenotomy, particularly when tested at 90 degrees of elbow flexion in full supination. Tenotomy cohorts demonstrate a 10% to 20% deficit in peak supination torque and tire more rapidly during sustained rotational work.

Cosmetic Deformity and Subjective Satisfaction

The incidence of a visible Popeye deformity ranges from 25% to 45% following tenotomy, compared to 3% to 13% following tenodesis (primarily caused by hardware slippage or early anchor failure). Demographic analyses demonstrate that male sex and a lower body mass index (BMI under 30 kg/m²) significantly increase the visibility of the Popeye deformity. However, subjective patient satisfaction remains exceptionally high (exceeding 90% to 95%) in both tenotomy and tenodesis cohorts, confirming that relief of pain is the primary driver of patient satisfaction.

10. Complications

Complications associated with proximal biceps tendon rupture and its surgical management are categorized by temporal onset:

11. Pearls and Pitfalls

Mastery of proximal biceps tendon management relies on strict clinical execution and intraoperative discipline:

Clinical and Surgical Pearls

• Pectoralis Major Tendon as the Tensioning Benchmark: In mini-open subpectoral tenodesis, use the inferior or superior border of the pectoralis major tendon insertion as a reliable anatomical landmark to reestablish the physiological length-tension relationship. Tag the tendon with a stay suture at the superior edge of the pectoralis major before releasing it intra-articularly to ensure exact anatomic resting tension.
• Resect the Entire Intra-Groove Segment: Always excise the proximal 2.0 to 3.0 cm of diseased, hypertrophic tendon tissue that occupied the bicipital groove. Retaining this chronically inflamed segment within the fibro-osseous tunnel is the single most common cause of persistent postoperative anterior shoulder pain.
• The 30% Diaphyseal Rule: When reaming the proximal humerus for interference screw fixation, ensure the reamer diameter does not exceed 30% of the humeral shaft diameter (typically 6.5 to 7.0 mm maximum). Ream strictly in the center of the bicipital groove perpendicular to the anterior cortex to prevent cortical stress risers and iatrogenic humerus fractures.
• Screen for Subscapularis Tears: Every proximal biceps tendon rupture or dislocation warrants meticulous inspection of the subscapularis footprint. An unstable or ruptured biceps tendon is an anatomical indicator of subscapularis upper border tears; repairing the subscapularis while addressing the biceps is critical to long-term anterior shoulder stability.

Pitfalls to Avoid

• Excessive Medial Retraction Hazards: Never place deep Hohmann or sharp retractor blades medial to the conjoint tendon during subpectoral exposure. Vigorous medial retraction can cause irreversible traction neuropraxia or direct transection of the musculocutaneous nerve.
• Overtensioning the Tenodesis: Pulling the biceps tendon too tightly into the bone socket overtensions the muscle belly, precipitating intractable postoperative muscle cramping, anterior shoulder tightness, and increased mechanical strain leading to anchor pullout. If the muscle belly appears abnormally bunched proximally, release and reset the tension.
• Undertensioning the Tenodesis: Securing the tendon with excessive slack recreates the Popeye deformity upon active muscle contraction, defeating the primary cosmetic objective of tenodesis surgery.
• Operating on Asymptomatic Auto-Tenotomies: Resisting the reflex to operate on an asymptomatic, retracted biceps in an elderly, low-demand individual avoids unnecessary surgical morbidity. These patients achieve excellent functional recovery without intervention.

12. Controversy

Two primary controversies dominate the contemporary literature on proximal biceps management:

Tenotomy vs. Tenodesis in Active Patients

The clinical debate between biceps tenotomy and biceps tenodesis represents one of the most vigorously investigated topics in modern shoulder surgery. Proponents of tenotomy advocate for its simplicity, zero implant costs, absence of hardware-related complications, lack of postoperative immobilization, and significantly faster initial pain relief (Belay et al.). Multiple prospective randomized trials and meta-analyses (MacDonald et al., Belk et al.) confirm that overall patient-reported functional outcomes (ASES, Constant scores) and elbow flexion strength are virtually equivalent between the two approaches.

Conversely, proponents of tenodesis emphasize that tenotomy carries a 25% to 45% rate of cosmetic Popeye deformity, compared to under 10% after tenodesis. Furthermore, tenotomy results in a documented 10% to 20% deficit in peak forearm supination torque and a higher incidence of muscle cramping during repetitive rotational activities (Belk et al.). While older, sedentary, or higher-BMI individuals may be unbothered by a cosmetic Popeye bulge, younger active males, athletes, and manual workers consistently benefit from tenodesis to preserve supination endurance and eliminate muscle fatigue.

Subpectoral vs. Suprapectoral Tenodesis

Surgeons remain divided regarding the optimal anatomical location for tenodesis fixation:

• All-Arthroscopic Suprapectoral Tenodesis: Performed within the articular margin or high bicipital groove. Advantages include avoiding an additional skin incision, lower risk of wound hematoma, and direct arthroscopic visualization. However, critics highlight that suprapectoral fixation leaves the distal segment of the tendon inside the fibro-osseous groove. This retained segment can harbor persistent tenosynovitis or “hidden lesions” in up to 10% to 15% of patients, leading to persistent anterior shoulder pain and higher revision rates.
• Mini-Open Subpectoral Tenodesis: Secured at the inferior border of the pectoralis major insertion. Completely exteriorizes and resects the entire diseased groove segment, eliminating the bicipital groove as a potential pain generator. Biomechanical studies also demonstrate higher load-to-failure properties with cortical button or unicortical interference screw constructs in the cortical bone of the proximal humeral shaft compared to the softer metaphyseal bone of the groove.

13. Evidence-Based Synthesis

Modern clinical decision-making is grounded in high-quality randomized controlled trials and prospective registry analyses, corroborated by seminal biomechanical and anatomical descriptions.

14. References

• MacDonald P, Verhulst F, McRae S et al. Biceps Tenodesis Versus Tenotomy in the Treatment of Lesions of the Long Head of the Biceps Tendon in Patients Undergoing Arthroscopic Shoulder Surgery: A Prospective Double-Blinded Randomized Controlled Trial. Am J Sports Med. 2020. doi:10.1177/0363546520912212 [Level I: Randomized Controlled Trial]
• Belk JW, Kraeutler MJ, Houck DA et al. Biceps tenodesis versus tenotomy: a systematic review and meta-analysis of level I randomized controlled trials. J Shoulder Elbow Surg. 2021. doi:10.1016/j.jse.2020.11.012 [Level I: Systematic Review / Meta-Analysis]
• Woodmass JM, McRae SMB, Lapner PL et al. Effect of age, gender, and body mass index on incidence and satisfaction of a Popeye deformity following biceps tenotomy or tenodesis: secondary analysis of a randomized clinical trial. J Shoulder Elbow Surg. 2021. doi:10.1016/j.jse.2021.05.003 [Level I: Randomized Controlled Trial]
• Oh JH, Lee YH, Kim SH et al. Comparison of Treatments for Superior Labrum-Biceps Complex Lesions With Concomitant Rotator Cuff Repair: A Prospective, Randomized, Comparative Analysis of Debridement, Biceps Tenotomy, and Biceps Tenodesis. Arthroscopy. 2016. doi:10.1016/j.arthro.2015.11.036 [Level I: Randomized Controlled Trial]
• Belay ES, Wittstein JR, Garrigues GE et al. Biceps tenotomy has earlier pain relief compared to biceps tenodesis: a randomized prospective study. Knee Surg Sports Traumatol Arthrosc. 2019. doi:10.1007/s00167-019-05682-1 [Level I: Randomized Controlled Trial]

15. Master Class Pro-Tip

Master Class Surgical Pearl: Calibrating Length-Tension and Groove Clearance in Subpectoral Tenodesis
During mini-open subpectoral tenodesis, achieving exact resting length-tension and complete elimination of groove nociception dictates clinical success. Prior to releasing the biceps tendon from the glenoid labrum arthroscopically, pass a heavy braided stay suture through the tendon at the absolute superior edge of the bicipital groove. Once the open subpectoral exposure is established, identify the inferior border of the pectoralis major tendon. Deliver the tendon into the wound; your pre-placed stay suture marks the exact distal margin of the intra-articular portion. Measure 20 to 25 mm distal to this marker to identify the point of fixation at the inferior border of the pectoralis major, and resect all degenerated tendon proximal to this level. When drilling the humerus, drill unicortically in the exact midline of the sulcus to prevent eccentric cortical thinning, and always cycle the elbow through full extension and flexion before setting the final interference screw or flipping the cortical button. If the muscle belly appears bunched or displaced, adjust tendon depth by 5 mm to prevent chronic postoperative cramping.

Master Class Surgical Pearl: Proximal Biceps Tenodesis & Management