The iliopsoas muscle consists of the fusion of the iliacus and psoas major muscles. The psoas muscle attaches along the underside of the backbones, and the iliacus attaches on the inner side of the pelvis. These two muscles join together and form a common tendon that attaches onto the lesser trochanter of the thigh bone (femur). The function of this muscle is to externally rotate and flex the hip joint. Animals can function without this muscle.
Iliopsoas muscle tears are a relatively common yet infrequently diagnosed injury in dogs. Tearing of this muscle is very painful and causes pain and lameness.
Iliopsoas strains or tears result from excessive stretching of this muscle during highly athletic activities such as agility training or fetching a tennis ball. The injury occurs commonly at or near the muscle-tendon junction, the weak link.
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