A 35-year-old man with advanced tuberculosis of the hip joint presents with inability to move the limb and a fixed deformity. Radiograph shows destruction of the femoral head and acetabulum with the femoral head displaced superiorly and posteriorly out of the acetabulum. There is no history of trauma. What is this complication called?

• A Posterior dislocation of the hip
• B Central fracture dislocation
• C Congenital dislocation of the hip
• D Pathological dislocation ✓

Explanation

Pathological dislocation in TB hip occurs due to destruction of the femoral head and acetabulum by the disease process, causing the head to dislocate superiorly and posteriorly without any traumatic event. It is a hallmark of neglected or advanced disease. Posterior traumatic dislocation follows trauma with a characteristic flexion-adduction-internal rotation deformity. Congenital dislocation presents in infancy. Central fracture dislocation is traumatic with acetabular fracture.

Reference: Maheshwari and Mhasker, Textbook of Orthopedics and Trauma, 6th ed.

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Written and medically reviewed by the StethoPrep medical team.