Musculi gemelli
The gemelli are small paired muscles (superior and inferior) located deep in the hip. They originate from the ischium near the lesser ischiatic notch and insert in the trochanteric fossa of the femur. Their actions are lateral rotation of the femur and stabilization of the hip joint. They are part of the deep hip-rotator group and are innervated by a branch of the sciatic nerve (roughly L6–S1). Because they are small and deeply located, they are not externally visible or easily palpated. Isolated injury is rare; they are more often considered as part of the overall deep hip musculature that stabilizes the joint during locomotion.
Origin: Ischium (near the lesser ischiatic notch)
Insertion: Trochanteric fossa of the femur
Action: Laterally rotates the femur; stabilizes the hip
Innervation: Sciatic nerve branch (L6-S1)
Rarely a primary source of pathology. May be involved secondarily in severe hip trauma or pelvic fractures. Imaging is difficult due to depth.
## Overview Pathology of the deep hip rotator muscles (such as the gemelli, obturator, or quadratus femoris group) is rarely isolated. It usually occurs as part of broader coxofemoral joint disease,
Deep hip pain after a fall or slip is uncommon as an isolated problem; most hind-limb lameness localizes lower in the limb or to the stifle/hock. Persistent deep hip pain needs veterinary evaluation.
## Overview Pathology of the deep hip rotator muscles (such as the gemelli, obturator, or quadratus femoris group) is rarely isolated. It usually occurs as part of broader coxofemoral joint disease, pelvic trauma, or muscle strain and contributes to deep-seated hip pain and altered hind-limb rotation. ## Causes Trauma or secondary involvement with hip joint injury. ## Diagnosis Advanced imaging and response to diagnostic analgesia. Clinical signs are non-specific. ## Treatment Rest, anti-inflammatories, and treatment of any concurrent joint or bone injury. ## Recovery and Prognosis Depends on associated lesions. Isolated muscle strain has a better outlook than fracture-related damage. ## Prevention Trauma avoidance. Signs include: deep hip pain; abnormal hind-limb rotation; reduced hip range of motion; confirmed on advanced imaging
Rarely a primary source of pathology. May be involved secondarily in severe hip trauma or pelvic fractures. Imaging is difficult due to depth.
Deep hip pain after a fall or slip is uncommon as an isolated problem; most hind-limb lameness localizes lower in the limb or to the stifle/hock. Persistent deep hip pain needs veterinary evaluation.
See the Gemelli on our interactive 3D horse model. Open 3D Model