Obturator Externus: Difference between revisions
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== Function == | == Function == | ||
{{#ev:youtube| | {{#ev:youtube|CglBvRB2JQ4}}<ref>Hip Rotator Series Part 1: Obturator Externus. Available from:https://www.youtube.com/watch?v=CglBvRB2JQ4 [last accessed 30/3/2020]</ref> | ||
* Obturator externus externally rotates hip during flexion but not in hip extension. | * Obturator externus externally rotates hip during flexion but not in hip extension. | ||
* It may assist in the adduction of the hip joint<ref name=":1" />. | * It may assist in the adduction of the hip joint<ref name=":1" />. | ||
Revision as of 09:15, 30 March 2020
Original Editor - Manisha Shrestha
Top Contributors - Manisha Shrestha, Vidya Acharya and Kim Jackson
Description[edit | edit source]
Obturator externus (OE) muscle is the conical shaped short external rotator located in the outer side of obturator membrane in lateral wall of pelvis.
Anatomy[edit | edit source]
Origin[edit | edit source]
The Obturator externus (OE) muscle originates from the rami of pubis and ischium, the external bony margin of the obturator foramen in a clockwise direction from 12 o'clock around to the 10 o'clock position (right hip viewed from the front), and a few fibres arose from the obturator membrane.[2][3]
Insertion[edit | edit source]
It formed a musculotendinous junction at the level of the femoral neck. The fibres passed laterally along the inferior margin of the acetabulum, acting like a sling at the inferior part of the neck and inserted as a cylindrical tendon into the trochanteric fossa with some fibres extending towards the piriformis fossa.[2]
Nerve[edit | edit source]
The posterior branch of the obturator nerve, L2-L4[3].
Artery[edit | edit source]
The anterior branch of obturator artery and medial circumflex femoral artery.
Function[edit | edit source]
- Obturator externus externally rotates hip during flexion but not in hip extension.
- It may assist in the adduction of the hip joint[3].
- It helps to stabilise the head of the femur in the socket during flexion and internal rotation as it's posterior fibers reinforce the posterior capsule of hip joint. [2]
Clinical relevance[edit | edit source]
- Obturator externus bursitis
- repetitive Eccentric contraction of Obturator externus causing musculotendinous tear in professional basketball players.
- impingement syndrome after total hip replacement[2]
Assessment[edit | edit source]
Position: Patient is seated on the plinth with knees bent over the edge[3].
Fixation: The patient holds onto the plinth. The weight of the trunk stabilizes him during the test[3].
Test: Ask the patient to laterally rotate the thigh. The therapist applies counterpressure on the lateral aspect of the lower thigh. This pressure also helps in stabilising the patient. The other hand of the therapist applies pressure to the medial side of the leg just above the ankle, pushing the leg in outward direction; thus rotating the thigh medially[3].
Treatment[edit | edit source]
Resources[edit | edit source]
- ↑ Kenhub - Learn Human Anatomy. Functions of the obturator externus muscle - 3D Human Anatomy | Kenhub. Available from: https://www.youtube.com/watch?v=3LHk8KUAcw8 [last accessed 30/3/2020]
- ↑ 2.0 2.1 2.2 2.3 Gudena R, Alzahrani A, Railton P, Powell J, Ganz R. The anatomy and function of the obturator externus. Hip International. 2015 Sep;25(5):424-7.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Kendal, McCreary, Provance; Muscle Testing and Function with Posture and Pain; 4th Edition; Lateral Rotators of Hip Joint, Page 218.
- ↑ Hip Rotator Series Part 1: Obturator Externus. Available from:https://www.youtube.com/watch?v=CglBvRB2JQ4 [last accessed 30/3/2020]
