The flexion-extension axis of the knee joint passes through which anatomical landmark used as the reference for tibial osteotomy planning?
- A Centre of the tibial plateau
- B Posterior cruciate ligament femoral attachment
- C Transepicondylar axis of the femur ✓
- D Anterior intercondylar area of the tibia
Correct answer: C. Transepicondylar axis of the femur
Explanation
The transepicondylar axis of the femur (connecting medial and lateral epicondyles) represents the functional flexion-extension axis of the knee and is used as the gold standard reference for component rotation in total knee arthroplasty and for osteotomy planning. Positioning the tibial cut perpendicular to this axis minimises rotational malalignment. The posterior condylar axis is also used but has more variability; the transepicondylar axis has better reproducibility on MRI.
Reference: BD Chaurasia's Human Anatomy, 8th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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