Primary THA Perioperative Issues – Case Presentations and Discussion

1. High-Yield Summary

Primary total hip arthroplasty (THA) is one of the most successful and cost-effective reconstructive procedures in modern medicine, reliably alleviating intractable articular pain, correcting structural deformity, and restoring biomechanical function in patients with end-stage coxopathy.

• Primary Clinical Indication: End-stage degenerative osteoarthritis, osteonecrosis of the femoral head, inflammatory arthropathies, or post-traumatic coxarthrosis refractory to comprehensive conservative management with documented joint space collapse, intractable pain, and progressive mobility limitation.
• The Critical Move: Precise dual-plane reconstruction of the native hip center of rotation, femoral offset, and leg length while establishing stable implant press-fit fixation and co-aligning acetabular and femoral combined anteversion within safe anatomical boundaries (30 to 40 degrees).
• Catastrophic Errors to Avoid: Unrecognized intraoperative femoral calcar crack or spiral cortical fracture during broaching or stem impaction leading to catastrophic early stem subsidence; uncorrected leg length discrepancy or offset deficiency inducing abductor lurch and recurrent dislocation; and retractor misplacement causing direct neurapraxia or transection of the sciatic or femoral neurovascular bundle.

2. Indications & Contraindications

Rigorous patient selection and thorough identification of modifiable host risk factors are essential to achieve durable prosthetic survivorship and prevent devastating perioperative complications.

Indications

• Primary Osteoarthritis: Kellgren-Lawrence Grade 3 or 4 degenerative joint disease characterized by complete loss of articular cartilage, subchondral sclerosis, osteophyte formation, and subchondral geode cysts.
• Osteonecrosis of the Femoral Head (Avascular Necrosis): Ficat and Arlet Stage III or IV osteonecrosis with subchondral crescent sign, segmental femoral head collapse, and secondary acetabular degenerative chondrosis.
• Inflammatory and Autoimmune Arthropathies: Rheumatoid arthritis, ankylosing spondylitis, psoriatic arthritis, or systemic lupus erythematosus resulting in central joint space narrowing, severe bone osteopenia, and acetabular protrusion.
• Post-Traumatic Coxarthrosis: Secondary articular cartilage degradation following prior acetabular fractures, femoral neck fractures, or high-energy posterior hip dislocations with or without hardware in situ.
• Developmental Dysplasia of the Hip (DDH): Crowe Type I or II dysplastic hip disease with shallow acetabular roof, excessive anteversion, narrow femoral canal, and altered proximal femoral torsion.
• Failure of Comprehensive Non-Operative Modalities: Refractory pain, nighttime wakefulness, and functional restriction despite structured physical therapy, non-steroidal anti-inflammatory medications, weight reduction, ambulatory aids, and intra-articular corticosteroid or hyaluronic acid injections.

Contraindications

• Absolute Contraindications: Active local joint sepsis or systemic bacteremia; active soft-tissue infection or open ulceration directly overlying the intended surgical incision; permanent paralysis or complete absence of the abductor musculature (gluteus medius and minimus); and a painless, stable, well-aligned prior hip arthrodesis.
• Relative Contraindications: Uncontrolled diabetes mellitus (glycated hemoglobin HbA1c exceeding 8.0%), severe morbid obesity (body mass index BMI exceeding 40 kg/m²), active tobacco and nicotine inhalation or chewing, uncorrected chronic severe anemia (hemoglobin less than 10 g/dL), active untreated dentoalveolar infection or active urinary tract bacteruria, severe peripheral arterial insufficiency, and severe neurocognitive impairment precluding adherence to postoperative hip precautions and physical therapy.

3. Preoperative Planning & Biomechanical Principles

Preoperative digital radiographic templating allows the reconstructive surgeon to predict implant dimensions, anticipate proximal femoral morphology variations, assess spinopelvic mobility, and restore native hip biomechanics accurately.

Radiographic Imaging Workup

Standard radiographic evaluation requires a high-quality low anteroposterior (AP) pelvis radiograph centered on the superior border of the pubic symphysis with both lower extremities internally rotated 15 degrees to compensate for femoral neck anteversion and display true neck-shaft angle and femoral offset. In addition, dedicated AP and cross-table lateral views of the symptomatic hip must be obtained. When complex dysplastic morphology or prior pelvic fracture hardware is present, a non-contrast pelvic CT scan with 3D volumetric reconstruction is utilized.

Spinopelvic Kinematics & Hip-Spine Syndrome

Patients presenting with concomitant lumbar spondylosis, prior instrumented lumbar spinal fusion, or severe degenerative disc disease require dedicated standing and sitting lateral lumbar-pelvis radiographs to evaluate spinopelvic flexibility:

• Normal Flexible Spine: Upon sitting, the lumbar lordosis flattens, the pelvis rolls posteriorly (sacral slope decreases by more than 10 degrees), and the functional acetabular cup anteversion naturally increases to provide anterior clearance and prevent anterior prosthetic impingement and posterior dislocation during deep hip flexion.
• Rigid or Fused Spine (Stiff Spinopelvic Alignment): A rigid spine fails to tilt the pelvis posteriorly when transitioning from standing to sitting (change in sacral slope less than 10 degrees). This fixed pelvic tilt predisposes the patient to posterior impingement and anterior dislocation while standing, or anterior impingement and posterior dislocation while sitting. In stiff or fused spinopelvic phenotypes, surgeons must plan expanded safe zones, optimized cup inclination (40 to 42 degrees), adjusted anteversion (20 to 25 degrees), or select a dual mobility construct.

Femoral Morphology Classification (Dorr Types)

The proximal femoral canal geometry directly governs femoral stem fixation philosophy, broach handling, and fracture risk:

• Dorr Type A (“Champagne Flute”): Thick, dense cortices with a narrow diaphysis and immediate funnel-shaped metaphysis. Common in young, active males. Carries high hoop stresses during broaching; requires meticulous reaming or gentle progressive rasping to avoid calcar burst or proximal femoral shaft splitting.
• Dorr Type B: Progressive thinning of posterior and medial cortices with wider intramedullary canal. Represents typical middle-aged adult bone morphology; excellently suited for standard tapered-wedge cementless stems.
• Dorr Type C (“Stovepipe”): Wide, cylindrical femoral canal with paper-thin cortices, loss of medial trabecular arches, and porous cancellous bone. Frequently encountered in elderly osteoporotic females and rheumatoid arthritis. Poorly suited for short tapered-wedge cementless stems due to high risk of subsidence and rotational instability; indications favor polished cemented femoral stems or fully porous-coated cylindrical stems.

4. Patient Positioning & Setup

Rigid patient stabilization and rigorous pressure point protection are mandatory prerequisites before initiating sterile surgical draping.

Lateral Decubitus Setup (Posterior & Direct Lateral Corridors)

The patient is placed in a true lateral decubitus position on a radiolucent surgical table supported by anterior pelvic pegs (positioned firmly against the anterior superior iliac spines and pubic symphysis) and a broad posterior sacral peg. Pelvic verticality must be verified manually; an undetected anterior or posterior pelvic tilt of 10 to 15 degrees dramatically alters the perceived acetabular reamer angle, leading to severe cup retroversion or excessive vertical inclination. An axillary roll is placed two fingerbreadths caudal to the axilla to unload the brachial plexus. The dependent peroneal nerve is protected with foam padding at the fibular head, and the non-operative lower extremity is cushioned.

Supine Setup (Direct Anterior Corridor)

The patient is positioned supine on either a specialized orthopaedic traction table with mechanical leg spars or a standard radiolucent operating table. Both anterior superior iliac spines (ASIS) must be palpable and collinear with the horizontal table plane. The sterile field must accommodate intraoperative fluoroscopic C-arm positioning to obtain clear AP pelvis and axial femoral imaging during reaming, cup impaction, and femoral canal preparation.

5. Surgical Approach & Internervous Corridors

Surgical exposure must respect anatomical planes, preserve pericapsular soft tissues, and prevent traction injuries to regional motor and sensory nerves.

Posterior (Moore / Southern) Approach

The posterior approach represents the most widely utilized surgical corridor globally, offering exceptional exposure of the proximal femur and posterior acetabular column without compromising the abductor mechanism:

• Internervous / Intermuscular Plane: The gluteus maximus is bluntly split along its myofascial fibers (innervated by the inferior gluteal nerve). The deep plane involves mobilizing and tagging the piriformis and obturator internus short external rotators from their femoral insertions.
• Neurovascular Danger Zone: The sciatic nerve lies immediately posterior to the obturator internus and gemelli tendons. It must be protected by maintaining the hip in continuous extension and slight external rotation during posterior retraction. Never place unpadded or unguided metal retractors deep into the greater sciatic notch.
• Capsular Repair Imperative: Transosseous reattachment of the posterior capsule and short external rotators through drill holes at the posterior trochanteric crest restores posterior restraint and reduces dislocation rates to baseline levels comparable to anterior approaches.

Direct Anterior (Hueter / Smith-Petersen) Approach

The direct anterior approach utilizes an intermuscular and true internervous corridor:

• Internervous Plane: Superficial internervous plane between tensor fasciae latae (TFL, innervated by superior gluteal nerve) laterally and sartorius (innervated by femoral nerve) medially. Deep internervous plane between TFL and rectus femoris (innervated by femoral nerve).
• Neurovascular Danger Zone: The lateral femoral cutaneous nerve (LFCN) crosses the sartorius fascia within 1 to 2 cm medial to the ASIS. Incision should begin 2 to 3 cm distal and lateral to the ASIS over the belly of the TFL. The ascending branch of the lateral femoral circumflex artery (LFCA) crosses the deep interval and must be ligated or bipolar-cauterized to prevent brisk postoperative hematoma.

6. Operative Technique & Sequential Steps

Executing primary total hip arthroplasty requires methodical discipline through every sequential bone cut, canal preparation phase, and stability check.

Step 1: Surgical Exposure and Capsulotomy

Incise the fascia lata and split the gluteus maximus fibers. Identify the subgluteal bursa and sweep it posteriorly to reveal the piriformis, gemelli, and obturator internus insertions. Tag the piriformis and conjoint tendon with non-absorbable traction sutures and peel them from the trochanteric crest. Incise the posterior hip capsule with an inverted-T or L-shaped capsulotomy, peeling the capsular flaps to expose the femoral head and acetabular margin.

Step 2: Femoral Head Dislocation and Osteotomy

Dislocate the femoral head gently using internal rotation, flexion, and adduction. Mark the templated femoral neck resection level using a sterile ruler referencing the superior border of the lesser trochanter (typically 1.0 to 1.5 cm proximal) and the trochanteric fossa. Perform the osteotomy using an oscillating saw with copious irrigation, ensuring the saw blade maintains perpendicularity to the femoral neck axis to avoid undercutting or damaging the greater trochanter.

Step 3: Acetabular Exposure, Reaming, and Cup Seating

Place specialized acetabular retractors: an anterior retractor over the anterior column, an inferior retractor beneath the transverse acetabular ligament (TAL), and a posterior retractor along the ischium. Excise the labrum, pulvinar fat pad, and cotyloid ligament to expose the true medial bony floor (acetabular teardrop and cotyloid notch). Ream sequentially starting with a small starter reamer to establish depth down to the medial wall, then expand concentric reaming until bleeding subchondral bone and peripheral rim fit are achieved. Impact the hemispherical porous acetabular cup targeting 40 degrees of operative inclination and 15 to 20 degrees of operative anteversion (parallel to the transverse acetabular ligament). Confirm complete cup bottoming via apical screw hole palpation and insert supplementary dome fixation screws into the safe posterosuperior quadrant.

Step 4: Femoral Canal Preparation and Broaching

Deliver the proximal femur into operative view using internal rotation, adduction, and 90 degrees of flexion with an anterior femur-elevating retractor. Open the femoral canal with a box osteotome or starter reamer positioned far lateral against the inner cortex of the greater trochanter to prevent varus broach trajectory. Broach sequentially along the long axis of the femur, maintaining 10 to 15 degrees of anteversion. Advance broaches gradually until rotational stability and longitudinal axial resistance are achieved without cortical binding.

Step 5: Trial Reduction, Range of Motion, and Stability Assessment

Seat the trial neck and modular femoral head. Reduce the hip gently with axial traction. Assess mechanical stability and impingement through an exhaustive kinetic arc: 90 degrees of flexion with 45 degrees of internal rotation (testing posterior instability), 30 degrees of extension with full external rotation and adduction (testing anterior instability), and lateral push-pull shuck testing (verifying abductor tension and myofascial balance). Verify leg length equality by comparing patellar levels, heel levels, and palpable anterior superior iliac spine distance.

Step 6: Final Implant Seating and Anatomical Soft-Tissue Closure

Impact the final press-fit femoral stem ensuring collinear alignment with the broached envelope. Seat the highly cross-linked polyethylene or ceramic liner into the acetabular shell. Clean and dry the femoral taper meticulously, place the definitive ceramic or cobalt-chromium femoral head, and secure it with a firm axial blow using a dedicated plastic head impactor. Reconstruct the posterior capsule and tagged external rotators through transosseous drills holes in the trochanteric crest, followed by watertight layered closure of the fascia lata and subcuticular skin.

The Critical Move

The definitive critical move in primary THA is optimizing combined anteversion between the acetabular shell and the femoral stem within the 30 to 40 degree biological window. If the femoral stem achieves less anteversion due to native retroversion, the acetabular component must be adjusted accordingly; conversely, if the stem anteverts excessively, the cup must be seated with less anteversion to eliminate bony or prosthetic impingement and eradicate catastrophic dislocation risk.

7. Pearls and Pitfalls

Mastering technical pearls while preempting predictable intraoperative pitfalls ensures reproducible clinical outcomes and safeguards patient safety.

Operative Stage	Master Surgical Pearl	Common Pitfall & Rescue Maneuver
Incision & Approach	Orient the skin incision slightly curved along the posterior border of the trochanter, ensuring the distal limb lies along the femoral shaft axis to permit unobstructed straight reamer access.	Placing the incision too anteriorly restricts posterior trochanteric exposure, forcing broaches into varus; rescue by extending the fascial split proximally.
Acetabular Exposure	Use the transverse acetabular ligament (TAL) as the anatomical reference plane for cup anteversion; seating the inferior cup rim coplanar to the TAL reliably avoids excessive retroversion.	Reaming without clearing the anterior and inferior osteophytes causes cup verticality and retroversion; clear soft tissues down to the true cotyloid floor before reaming.
Femoral Entry	Remove the lateral bone overhang from the greater trochanter with a canal finder or box gouge to allow coaxial broach seating.	Entering too medially inevitably directs the broach into varus and threatens lateral cortex perforation; redirect lateral entry early.
Broach Sizing	Listen to changes in pitch during mallet strikes; a crisp, high-pitched ringing sound indicates cortical seating and warns against oversized broaching.	Forcing the final broach when axial progress stops risks a calcar burst fracture; immediately inspect the calcar and apply a prophylactic cerclage cable.
Trial Reduction	Check myofascial tension with the drop test and shuck test; 2 to 3 mm of axial pistoning under firm traction indicates balanced soft tissues.	Over-lengthening to compensate for abductor laxity causes sciatic neurapraxia and chronic groin pain; increase offset rather than neck length.

8. Postoperative Protocol & Rapid Recovery

Modern enhanced recovery after surgery (ERAS) multimodal clinical pathways expedite functional recovery while minimizing perioperative morbidity.

Immediate Postoperative Phase (Day of Surgery to Post-Op Day 1)

• Weight-Bearing Status: Immediate full weight-bearing as tolerated (WBAT) with walker or forearm crutches under supervised physical therapy within 2 to 4 hours following surgical completion.
• Multimodal Analgesia: Scheduled oral acetaminophen (1000 mg every 8 hours), COX-2 specific inhibitor (celecoxib 200 mg daily or meloxicam 15 mg daily), intravenous dexamethasone (4 to 8 mg perioperatively), and periarticular local infiltration analgesia (ropivacaine, epinephrine, and ketorolac). Reserve oral immediate-release opioids strictly for breakthrough pain.
• Venous Thromboembolism (VTE) Prophylaxis: Stratified VTE prophylaxis initiated 12 to 24 hours postoperatively. For standard-risk patients, enteric-coated aspirin (81 mg twice daily) for 35 days combined with bilateral pneumatic compression devices. High-risk patients (prior VTE, active malignancy, hypercoagulability) receive direct oral anticoagulants (apixaban 2.5 mg twice daily or rivaroxaban 10 mg daily) or low-molecular-weight heparin (enoxaparin 40 mg subcutaneous daily).

Phase-by-Phase Rehabilitation Protocol

• Phase I (Weeks 0 to 2): Ambulation with assistive devices, active and active-assisted hip range-of-motion exercises, isometric gluteal and quadriceps sets, ankle pumps, and cryotherapy 20 minutes every 2 hours. Strict adherence to hip stability guidelines based on surgical approach.
• Phase II (Weeks 2 to 6): Progression from walker to single crutch or cane as abductor strength recovers. Stationary upright cycling with zero resistance, closed-chain kinetic strengthening (mini-squats, leg presses), gait retraining, and scar desensitization.
• Phase III (Weeks 6 to 12): Weaning from all ambulatory walking aids, progressive resistance hip abduction and extension strengthening, single-leg balance and proprioceptive training, and resumption of unrestricted low-impact community walking.
• Phase IV (Beyond 12 Weeks): Advanced core and pelvifemoral functional conditioning, return to recreational sports (swimming, cycling, doubles tennis, golf), while avoiding high-impact contact athletics and extreme joint loading.

9. Clinical Outcomes & Survivorship

Primary total hip arthroplasty yields exceptional clinical success and pain relief. Modern registry data and long-term cohort trials consistently document 15-to-20-year implant survivorship rates between 90% and 95% using contemporary cementless femoral stems and highly cross-linked polyethylene or ceramic-on-ceramic bearings. Validated patient-reported outcome measures, including the Harris Hip Score (HHS), Hip disability and Osteoarthritis Outcome Score (HOOS), and Oxford Hip Score (OHS), demonstrate profound, statistically significant improvements within 6 to 12 weeks post-surgery, with patient satisfaction rates surpassing 92% across all age demographics.

10. Complications & Avoidance Strategies

Complications in primary total hip arthroplasty, while uncommon, require systematic prevention protocols, rapid diagnosis, and decisive surgical intervention.

Complication	Incidence Rate	Primary Mechanism & Risk Factors	Prevention & Management Strategy
Intraoperative Periprosthetic Femoral Fracture	1.0% to 3.5% (cementless)	Excessive broaching torque, Dorr Type A rigid champagne flute canal, cortical reamer binding, or oversized stem impaction.	Apply prophylactic cerclage cable prior to final broaching or stem seating if calcar fissuring occurs; convert to collared or diaphyseal-engaging bypass stem if fracture extends below lesser trochanter.
Prosthetic Joint Dislocation	1.0% to 2.5%	Implant malposition (out of combined anteversion target), abductor muscle insufficiency, spinopelvic rigidity, or neuromuscular disorder.	Verify stability across full kinetic arc; optimize cup inclination (40 degrees) and anteversion (15 to 20 degrees); utilize larger femoral heads (32 to 36 mm) or dual mobility bearings in high-risk spinopelvic patients.
Peroneal / Sciatic Nerve Palsy	0.5% to 1.5%	Limb lengthening exceeding 2.0 cm, direct retractor pressure in sciatic notch, or hematoma compression.	Limit acute leg lengthening to under 2.0 cm; maintain hip extension and external rotation during posterior retraction; avoid blind retractor placement near sciatic notch; emergently evacuate compressive hematomas.
Prosthetic Joint Infection (PJI)	0.5% to 1.0%	Airborne contamination, hematogenous seeding, uncontrolled diabetes (HbA1c > 8%), morbid obesity, malnutrition.	Administer weight-adjusted intravenous cefazolin within 60 minutes prior to incision; maintain intraoperative normothermia; utilize dilute povidone-iodine wound irrigation and dual-antibiotic bone cement if cementing.
Venous Thromboembolism (DVT / PE)	0.5% to 1.2% (symptomatic)	Venous stasis from femoral twisting, surgical endothelial trauma, hypercoagulable state.	Risk-stratified chemoprophylaxis for 35 days postoperatively, intraoperative pneumatic compression boots, and rapid ambulation within 2 to 4 hours after surgery.
Clinically Significant Leg Length Discrepancy	1.0% to 2.0%	Inaccurate preoperative templating, failure to reference lesser trochanter or acetabular teardrop, or asymmetrical pelvic tilt.	Utilize intraoperative calcar reference markers, cross-check trial femoral neck lengths with opposite extremity landmarks, and confirm leg lengths fluoroscopically when indicated.

11. Controversies & Panel Discussion Points

Modern hip arthroplasty conferences and clinical panels actively debate nuanced technical scenarios presented during complex primary reconstructions.

Case Scenario 1: The Rigid Dorr Type A Femur and Calcar Fracture Risk

In young patients presenting with dense Dorr Type A femoral canals, debate centers on whether to utilize a short metaphyseal tapered-wedge stem versus a standard-length collared stem. Panel consensus emphasizes that collared tapered-wedge stems provide immediate axial cortical loading, transfer stress directly to the calcar, and resist catastrophic subsidence; however, aggressive broaching without lateral trochanteric relief risks calcar splitting. Prophylactic cerclage cabling placed around the proximal femur prior to final broaching eliminates the risk of hoop-stress propagation and allows secure cementless press-fit fixation without sacrificing stability.

Case Scenario 2: Severe Spinopelvic Imbalance and Recurrent Instability Risk

Patients presenting with multi-level lumbar spinal fusion (L2 to sacrum) lose pelvic mobility and demonstrate a fixed anterior or posterior pelvic tilt. When seating the acetabular component in these high-risk individuals, standard Lewinnek safe zones (40 degrees inclination, 15 degrees anteversion) fail to prevent impingement. Panel experts recommend obtaining functional sitting lateral radiographs preoperatively to assess lumbar-pelvic stiffness. In rigid stiff spines, surgeons should consider dual mobility bearing constructs or adjust functional cup anteversion higher (20 to 25 degrees) to avoid anterior impingement during sitting and subsequent posterior dislocation.

Case Scenario 3: Blood Management, Anticoagulation, and Tranexamic Acid Protocols

The universal adoption of intravenous and topical tranexamic acid (TXA) has transformed total hip arthroplasty into an ultra-low transfusion procedure. Debate persists regarding optimal dosing routes in patients with recent cardiovascular stenting or venous thromboembolic history. High-level evidence confirms that 1 to 2 grams of intravenous TXA administered prior to skin incision, combined with topical periarticular irrigation (1 to 2 grams in 100 mL saline), significantly reduces perioperative hemoglobin drop and wound hematoma formation without elevating the incidence of venous thromboembolic events or arterial thrombosis.

Case Scenario 4: The Obese Patient with Nutritional Depletion

Patients with severe obesity (BMI exceeding 35 to 40 kg/m²) frequently suffer from paradoxical malnutrition characterized by hypoalbuminemia (serum albumin less than 3.5 g/dL), vitamin D deficiency, and impaired tissue healing. Clinical discussion highlights that surgical site infections in this demographic are driven by wound edge necrosis, prolonged operative duration, and large subcutaneous dead space. Preoperative nutritional optimization, strict glycemic control, multi-layer watertight fascial closure, and closed-incision negative pressure wound therapy (ciNPWT) are recommended to mitigate infection risk.

12. Key Discussion Takeaways

• Combined Anteversion Governs Stability: Acetabular cup orientation and femoral stem anteversion must be co-aligned dynamically within a 30 to 40 degree window to prevent mechanical impingement and eliminate dislocation risk.
• Spinopelvic Mechanics Dictate Cup Orientation: Evaluate lumbar spinal stiffness preoperatively; patients with lumbar fusion or rigid spines require tailored acetabular anteversion or dual mobility implants.
• Prophylactic Calcar Cerclage Protects Bone: When preparing narrow Dorr Type A canals or inserting collared press-fit stems, place a prophylactic cerclage wire or cable at the first hint of calcar fissuring to prevent spiral diaphyseal crack propagation.
• Offset Restoration Protects Abductor Mechanics: Restoring native femoral offset tightens abductor myofascial tension, decreases joint reactive forces, and stabilizes the hip without introducing symptomatic leg lengthening.
• Multimodal ERAS Protocols Accelerate Mobilization: Integrating preoperative optimization, motor-sparing regional anesthesia, intravenous tranexamic acid, and rapid ambulation within 2 to 4 hours post-op drastically shortens hospitalization and reduces medical morbidity.

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.

Clinical Question / Investigation	Level of Evidence	Pivotal Landmark Study	Study Design & Methodology	Cohort Size / Follow-up	Primary Outcome / Effect Size	DOI
What is the optimal multimodal, procedure-specific analgesia protocol for pain control and functional recovery following primary total hip arthroplasty?	Level I (Therapeutic)	Anger M, Valovska T, Beloeil H et al (2021)	Systematic Review / Meta-Analysis	Systematic review and meta-analysis of 92 randomized controlled trials evaluating postoperative pain management in primary THA	Demonstrated that routine baseline administration of paracetamol, NSAIDs or COX-2 inhibitors, intravenous dexamethasone, and local infiltration analgesia (LIA) optimizes analgesia and minimizes opioid requirements without motor block.	DOI
Does the implementation of structured Enhanced Recovery After Surgery (ERAS) pathways improve outcomes and reduce hospital stay in primary total hip arthroplasty?	Level I (Therapeutic)	Morrell AT, Layon DR, Scott MJ et al (2021)	Systematic Review / Meta-Analysis	Systematic review of 39 comparative studies comprising 15,220 total hip and knee arthroplasty patients	Standardized ERAS multimodal pathways significantly decreased length of hospital stay by a mean of 1.5 to 2.0 days, decreased post-op nausea and vomiting, and expedited early ambulation without increasing 30-day readmissions or surgical revisions.	DOI
What are the evidence-based consensus recommendations for neuraxial and regional anesthesia techniques in primary hip arthroplasty?	Level I (Therapeutic)	Memtsoudis SG, Cozowicz C, Bekeris J et al (2021)	Systematic Review / Meta-Analysis	International consensus systematic review and meta-analysis of 145 randomized controlled trials and cohort studies	Neuraxial anesthesia and motor-sparing peripheral regional techniques (e.g., pericapsular nerve group [PENG] block or local infiltration) significantly reduced major perioperative morbidity, 30-day thromboembolic events, and postoperative pain scores compared to general anesthesia alone.	DOI
What are the clinical practice standards for the perioperative identification, evaluation, and surgical eradication of acute and chronic prosthetic joint infection?	Level V (Expert Conceptual Review)	Douglas R. Osmon, Elie F. Berbari, Anthony R. Berendt et al (2012)	Seminal Conceptual / Observational Study	IDSA multi-specialty expert panel consensus reviewing global clinical trials and surgical cohorts	Codified standardized perioperative diagnostic criteria (synovial fluid leukocyte esterase, cell count, culture protocols) and stratified surgical intervention algorithms (DAIR vs one-stage vs two-stage exchange) by infection timing and soft-tissue integrity.	DOI
Does the active maintenance of core perioperative normothermia reduce surgical site infection and hospital stay in major reconstructive surgery?	Level I (Therapeutic)	Andrea Kurz, Daniel I. Sessler, Rainer Lenhardt (1996)	Randomized Controlled Trial	Prospective, randomized, double-blind clinical trial of 200 surgical patients	Maintaining core normothermia (>36.5°C) reduced surgical-wound infection risk by 64% (p=0.009), reduced intraoperative blood loss, and significantly shortened hospital stay.	DOI

14. References

• Anger M, Valovska T, Beloeil H et al. PROSPECT guideline for total hip arthroplasty: a systematic review and procedure-specific postoperative pain management recommendations. Anaesthesia. 2021. doi:10.1111/anae.15498 [Level I (Therapeutic): Systematic Review / Meta-Analysis]
• Morrell AT, Layon DR, Scott MJ et al. Enhanced Recovery After Primary Total Hip and Knee Arthroplasty: A Systematic Review. J Bone Joint Surg Am. 2021. doi:10.2106/JBJS.20.02169 [Level I (Therapeutic): Systematic Review / Meta-Analysis]
• Memtsoudis SG, Cozowicz C, Bekeris J et al. Peripheral nerve block anesthesia/analgesia for patients undergoing primary hip and knee arthroplasty: recommendations from the International Consensus on Anesthesia-Related Outcomes after Surgery (ICAROS) group based on a systematic review and meta-analysis of current literature. Reg Anesth Pain Med. 2021. doi:10.1136/rapm-2021-102750 [Level I (Therapeutic): Systematic Review / Meta-Analysis]
• Douglas R. Osmon, Elie F. Berbari, Anthony R. Berendt et al. Diagnosis and Management of Prosthetic Joint Infection: Clinical Practice Guidelines by the Infectious Diseases Society of America. Clinical Infectious Diseases. 2012. doi:10.1093/cid/cis803 [Level V (Expert Conceptual Review): Seminal Conceptual / Observational Study]
• Andrea Kurz, Daniel I. Sessler, Rainer Lenhardt. Perioperative Normothermia to Reduce the Incidence of Surgical-Wound Infection and Shorten Hospitalization. New England Journal of Medicine. 1996. doi:10.1056/nejm199605093341901 [Level I (Therapeutic): Randomized Controlled Trial]

15. Master Class Pro-Tip

When broaching a narrow or sclerotic proximal femur, never treat calcar resistance as an invitation for more aggressive impaction. At the first subtle sound change or visible hairline stress fracture along the medial femoral neck, immediately halt broaching and pass a prophylactic cerclage cable around the proximal femur superior to the lesser trochanter before completing final broach seating or stem impaction. A prophylactic cable provides circumferential hoop reinforcement, preserves proximal cortical bone stock, and prevents catastrophic spiral split extension down the diaphysis, transforming a potential revision catastrophe into a secure, stable, full-weight-bearing construct.

Master Class Surgical Pearl: Primary Total Hip Arthroplasty