Muscles, tendons and bones comprise units. These units stabilize the pelvis and allow its motion. A strain occurs at a unit's weakest part. There is no loss of strength. Strength is diminished.
Severe strain requires surgical repair.
Chronic strains are caused by overuse. Acute strains are caused by direct injury or overstress. Tendons and muscles of the groin area, including abdominal, pelvic and thigh muscles. Pain in the groin with motion or stretching the leg at the hip joint. Muscle spasm in the abdomen or thigh.