These muscles are located in the groin. The longus originates on the pubic body just below the pubic crest and inserts on the middle third of the linea aspera.The brevis muscle originates on the inferior ramus and body of the pubis and has its attachment to the lesser trochanter and linea aspera of the femur. Trigger points in these muscles are the most common muscular cause of groin pain. Distal trigger points refer pain to the upper medial knee and down the tibia. Proximal trigger points refer into the anterior hip area.