The trendelenburg sign
It is found
when superior gluteal nerve is damage due to surgery, hip dislocation or poliomyelitis.
It caused by weakness of the hip
abductors, mostly the gluteal medius and minimus.
This condition makes it difficult
to support the body’s weight on the affected side.
In a normal gait situation, both
legs bear half of the body weight.
When the left leg is lifted, the
right leg takes the entire weight, abductors of left side contract and prevent dropping
of pelvis. But due to superior gluteal nerve lesion, the pelvis drops instead
of rising on the unsupported side.
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