Final answer:
The quadratus femoris muscle does not have a proximal attachment on the ischial tuberosity, unlike other listed hamstring muscles.
Explanation:
The muscle that does not have a proximal attachment on the ischial tuberosity is the quadratus femoris. The other muscles listed, such as the semimembranosus, semitendinosus, and biceps femoris, all have their proximal attachment on the ischial tuberosity.
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