|
Year |
2002 |
|---|---|
|
Question Number |
268 |
|
Category |
Musculoskeletal Trauma |
Question
What is the classification of the bone defect shown in fig 75 ?
1) Segmental
2) Combined seg and cavitary
3) Malalingnment/malunion
4) Ectasia (cavitary)
5) Stenosis
Figures
Answer (click for answer)
The correct answer is 4.
Femoral bone defects are typically either cavitary or segmental. There are six categories of femoral bone deficiencies 1) Segmental – any loss of bone of the supporting shell of the femur; 2) cavitary – loss of endosteal bone but an intact cortical shell; 3) combined deficiency – combined segmental and cavitary defects; 4) malalignment – loss of femoral geometry due to prior surgery, trauma or disease; 5) stenosis – occlusion of canal from trauma, fixation devices or bony hypertrophy; 6) femoral discontinuity – loss of femoral integrity from fracture or nonunion.
Reference: Maurer SG, Baitner AC, DiCesare PE: Reconstruction of the failed femoral component and proximal femoral bone loss in revision total hip surgery. J Am Academy Ortho Surgery 2000;8:354-363
Miller M: Review of Orthopaedics. Philadelphia PA. 2000: p250