Shortening of femur in DDH:
- a. To prevent the avascular necrosis of the head
- b. to decrease the internal rotation after splint
- c. to prevent coxa vara
- d. to prevent muscle fibrosis.
The correct answer is a. To prevent the avascular necrosis of the head.
Femoral shortening is a surgical procedure that involves shortening the femur, or thigh bone, in order to treat developmental dysplasia of the hip (DDH). DDH is a condition in which the hip joint is not properly formed, which can lead to a number of complications, including avascular necrosis (AVN) of the femoral head.
AVN is a condition in which the femoral head loses its blood supply and dies. This can lead to pain, stiffness, and eventually, the loss of function of the hip joint. Femoral shortening can help to prevent AVN by reducing the pressure on the femoral head and improving blood flow to the joint.
The other options are not as common reasons for femoral shortening in DDH:
- To decrease the internal rotation after splint:
Internal rotation is a common deformity in DDH, and splinting can help to correct this deformity. However, femoral shortening is not typically used to decrease internal rotation after splinting.
- To prevent coxa vara:
Coxa vara is a deformity of the femur in which the angle between the neck and shaft of the femur is decreased. Femoral shortening can help to prevent coxa vara by restoring the normal angle of the femur. However, coxa vara is not a common complication of DDH.
- To prevent muscle fibrosis:
Muscle fibrosis is a condition in which the muscles become stiff and fibrotic. Femoral shortening can help to prevent muscle fibrosis by improving the range of motion of the hip joint. However, muscle fibrosis is not a common complication of DDH.
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Orthopedics