Pelvitrochanteric Muscle Group

Authors

Affiliations

Nate Yomogida, B.S., SPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, B.S., SPT

Doctor of Physical Therapy

B.A. in Neuroscience

Table 1: Pelvitrochanteric Muscle Group

Muscle	Origin	Insertion	Innervation	Action
Inferior Gemellus	Ischial tuberosity	Medial surface of greater trochanter via obturator internus tendon	Nerve to Quadratus femoris L5 - S1	Hip: ER, Extension, Abduction
Obturator externus	Outer surface of Obturator membrane Adjacent bony boundaries	Trochanteric Fossa	Obturator n. L3 - L4	Hip: Adduction, ER Pelvis: Sagittal Stabilization
Obturator Internus	Obturator membrane and its bony boundaries	Medial surface of Greater Trochanter	Nerve to Obturator internus L5 - S1	Hip: ER, Extension, Abduction, Stabilization
Piriformis	Anterior Sacrum	Apex of the Greater Trochanter	Sacral Plexus Direct Br. S1 - S2	Hip (at <60° flexion): ER Hip: Abduction, Extension, Stabilization Hip (at ≥60° flexion): IR
Quadratus femoris	Lateral border of Ischial tuberosity	Intertrochanteric crest	Nerve to Quadratus femoris L5 - S1	Hip: ER
Superior gemellus	Ischial spine	Medial surface of greater trochanter via obturator internus tendon	Nerve to Obturator internus L5 - S1	Hip: ER, Extension, Abduction