Lateral unicondylar knee arthroplasty in osteonecrosis of lateral femoral condyle

Osteonecrosis of the knee usually more common on the medial femoral condyle.Lateral femoral condyle involvement is rare. In chronic cases, it becomes a challenge for surgeons to treat such cases with advanced arthritis and chronic collapsed cartilage involving most most of the femoral condyle using micro fracture, core decompression, fixation of free fragment for restoring the articular cartilage.Unicompartmental knee arthroplasty (UKA) is a procedure that enables restoring normal knee kinematics along with its function for arthritis limited to either compartment of knee joint by preserving unaffected compartment and sparing knee ligaments. We report a 24-year-old male patient with 4 years history of left knee joint pain and walking difficulty following history of Road Traffic Accident (RTA) 5 years back. Local examination of left knee joint revealed tenderness over lateral aspect of left knee joint with fixed flexion deformity of 10 degree and extension lag of 30 degree. Radiological findings suggestive of unicompartmental post-traumatic osteonecrosis of lateral femoral condyle. Surgical intervention aiming for anatomical and functional restoration of knee joint in form of Lateral Unicondylar Arthroplasty of lateral condyle was done. Patient was followed up for a period of 1 year. There were no complications noted and patient was mobilized immediately.

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