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Review Question - QID 3014

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QID 3014 (Type "3014" in App Search)
A 33-year-old man requires a transfemoral amputation because of a mangling injury to his leg. Six months after the amputation he has persistent difficulty with ambulation because his distal femur moves into a subcutaneous position in his lateral thigh. It persists despite a well-fitted prosthesis. What technical error is the most likely cause of his dysfunction?

Inadequate posterior skin flap

2%

33/1760

Inadequate anterior skin flap

1%

15/1760

Failure to bevel the distal femur

2%

28/1760

Lack of abductor myodesis to femur

5%

82/1760

Lack of adductor myodesis to femur

91%

1595/1760

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Adductor myodesis is a critical part of a transfemoral amputation. If it is not performed, then the abductors and hip flexors can cause the femur to abduct, leading to severe problems with gait. The gait disturbance persists despite proper prosthetic fitting. A transfemoral amputation is usually performed with equal anterior and posterior flaps.

Pinzur et al highlight the fact that amputations are reconstructive procedures and should leave the patient with a functional residual limb.

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