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What does the tip apex distance refer to in dynamic hip screw fixation? Statement: The tip apex distance in dynamic hip screw fixation is a measure of the distance between the tip of the lag screw and the apex of the femoral head.

Answer :

Final answer:

The tip apex distance is a critical measure in dynamic hip screw fixation, referring to the distance from the screw tip to the apex of the femoral head. This measurement helps predict the success of the surgery and the risk of fixation failure.

Explanation:

The tip apex distance in dynamic hip screw fixation refers to the measurement from the tip of the lag screw to the apex of the femoral head. This dimension is particularly critical in orthopedic surgery. It is used to estimate the stability of the fixation and to predict the possibility of a surgical outcome known as screw cut-out, where the screw exits the bone at the femoral head. An optimal tip apex distance is generally less than or equal to 25mm. This distance has been shown to correlate directly with the risk of fixation failure in the management of hip fractures. The larger the tip apex distance, the higher the risk of fixation failure.

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