What is the insertion of the muscle involved in the MRI images demonstrated below?
Musculoskeletal
No
U
A
DIAGNOSIS: Iliopsoas muscle tear
ANSWER: Lesser trochanter
EXPLANATION:
Sagittal and axial PD fat-sat images of the left hip demonstrate a grade 2 strain of the iliopsoasmuscle. The iliopsoas muscle is responsible for flexion of the hip and external rotation of the hip. Its insertion is on the lesser trochanter.
As a commonly tested trivia side note, avulsions of the lesser trochanter in adults are commonly associated with metastatic involvement or pathologic fracture of the lesser trochanter. The greater trochanter is the insertion point of the gluteus minimus, gluteus medius and short external rotator tendons. More specifically, the gluteus medius inserts on the lateral and posterior superior facets and the gluteus minimus inserts on the anterior facet of the greater trochanter.
The anterior inferior iliac spine is the attachment point of the rectus femoris. The adductor longus attaches to the pubic tubercle.
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