What is the obturator externus muscle?
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What is the obturator externus muscle?
Obturator externus (OE) muscle is the conical shaped short external rotator located in the outer side of obturator membrane in lateral wall of pelvis.
What does the obturator externus do?
We conclude that the Obturator externus muscle helps to stabilise the head of the femur in the socket. The mechanical model demonstrated that the primary action of the obturator externus muscle was to externally rotate the femur when the hip was in neutral position and flexed at 90°.
Where does obturator externus attach?
Trochanteric fossa of femur
Obturator externus muscle
| Origin | Anterior surface of obturator membrane, bony boundaries of obturator foramen |
|---|---|
| Insertion | Trochanteric fossa of femur |
| Action | Hip joint: Thigh external rotation, thigh abduction (from flexed hip); Stabilizes head of femur in acetabulum |
| Innervation | Obturator nerve (L3, L4) |
What causes obturator externus pain?
This injury is caused by an eccentric contraction of the obturator externus. It seems to be under-diagnosed. Discomfort can be minor in daily life, due to muscular compensations, but it can be detrimental for elite athletes. Patients seem to recover rapidly, without an actual relation to the severe imaging findings.
Which compartment is obturator externus?
medial compartment of thigh
The external obturator muscle, obturator externus muscle (/ˌɒbtjʊəˈreɪtər ɪkˈstɜːrnəs/; OE) is a flat, triangular muscle, which covers the outer surface of the anterior wall of the pelvis. It is sometimes considered part of the medial compartment of thigh, and sometimes considered part of the gluteal region.
What are psoas and obturator signs?
Psoas sign: Pain on passive extension of the right thigh. It is present when the inflamed appendix is retrocecal and overlying the right psoas muscle. Obturator sign: Pain on passive internal rotation of the hip when the right knee is flexed.
Can psoas pain cause abdominal pain?
The Psoas syndrome will typically present as a lower back abdominal/pelvic pain, and may radiate to the leg as the branches of the lumbar plexus pass through the muscle. Pain may worsen by hip flexion, passively or against resistance, as well as during extension of the hip joint.
Where is psoas pain?
What is psoas syndrome? Psoas syndrome is an uncommon, and often misdiagnosed, condition that can appear as refractory lower back pain (pain that stays even after treatment) accompanied by other symptoms. The condition occurs when the psoas muscle—the long muscle (up to 16 inches) in your back—is injured.
