Trendelenburg gait is an abnormal gait resulting from a defective hip abductor mechanism. The primary musculature involved is the gluteal musculature, including the gluteus medius and gluteus minimus muscles. The weakness of these muscles causes drooping of the pelvis to the contralateral side while walking.

Any pathology of the fulcrum, load, effort, or the lever which binds all three will lead to a positive Trendelenburg gait.

Failure of the fulcrum presents in the following conditions:

Osteonecrosis of hip
Legg-Calve-Perthes disease
Developmental dysplasia of the hip
Chronically dislocated hips secondary to trauma
Chronically dislocated hips secondary to infections like tuberculosis of the hip
Failure of the lever is a feature in the following conditions:

Greater trochanteric avulsion
Non-union of the neck of the femur
Coxa Vara
Failure of effort presents in the following conditions:

L5 radiculopathy
Superior gluteal nerve damage
Gluteus medius and minimus tendinitis
Gluteus medius and minimus abscess
Post total hip arthroplasty

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