Lurching gait is seen due to paralysis of (LQ)
|A||Tensor fascia lata|
The supportive effect of the glutei (medius and minimus) on the pelvis when the contralateral foot is raised depends on the following conditions. The two muscles, and their innervation, must be functioning normally. The components of the hip joint, which forms the fulcrum, must be in their usual relation. The neck of the femur must be intact, with its normal angulation to the shaft.
When any one of these conditions is not fulfilled, e.g. in paralysis of the glutei, congenital dislocation of the hip, or coxa vara, the supporting mechanism is upset and the pelvis sinks on the unsupported side when the patient tries to stand on the affected limb. This is known clinically as Trendelenburg's sign. Individuals with paralysis of gluteus medius and minimus have a characteristic lurching gait. Provided that these two muscles are intact, paralysis of other muscles acting on the hip joint produces remarkably little deficit in walking, or even in running.