Broad Differential Diagnosis:
Considering the patient's history of trauma and presentation with ecchymosis in the posterior thigh associated with palpable tenderness of the quadriceps tendon and proximal hamstring muscle groups, the initial diagnosis was proximal hamstring injury at the myotendinous junction or ischial tuberosity avulsion fracture. Considering the patient had global weakness in strength including resisted hip adduction, adductor (groin) muscle strain was also in the differential but less likely. Ischial tuberosity apophysitis, gluteus medius tendinopathy, and iliotibial band syndrome were also in consideration due to their proximity and functional similarities but thought to be less likely.
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