Author: Kevin B. Rosenbloom, C.Ped, Sports Biomechanist
The hip joint is an intricate system and the movements that arise from this area are so crucial to discuss. Adduction is one of these movements that will be addressed below along with an exploration into the muscle bodies that contribute to this movement and some research about each of the muscle.
Hip adduction is the medial, superior raise of the thigh and leg at the hip joint, crossing the other leg and the body’s sagittal plane. The range of motion has been estimated to vary within 15-45° with a general mean of 20-30° (Roaas & Andersson 1982, Washington State DSHS 2014, Quinn 2019). The pectineus, adductors (longus, brevis, magnus), gracilis, gemelli (superior, inferior) and quadratus femoris are the most significant contributors to hip adduction (Visible Body 2019). It is important to note that other sources have suggested some contribution by the obturator externus (Platzer 2004), but the muscle’s insertion does not necessarily favor that assumption.
Anterior and Medial Compartments
The adductor group makes up the medial compartment of the thigh. The adductor longus is a flat, triangular muscle that lies on the same plane as the pectineus, above all other adductors and attaches just laterally from the pubic symphysis. As its body widens, it inserts at the femoral linea aspera, just between the vastus medialis and adductor magnus. According to Platzer, this muscle can be a partial culprit in giving assistance to hip/femoral anteversion (242).
The adductor brevis muscles are also triangular in shape and their narrow attachment is on the anterior surfaces of the superior and inferior pubic rami just between the gracilis and obturator externus. As the body of the muscle proceeds distally from its origin, deeper than the pectineus and a. longus, it attaches at the distal lesser femoral trochanter and into the proximal linea aspera on the femur. According to one study on 50 cadavers, the adductor brevis was dually innervated, potentially giving the muscle a greater energy supply (Miura et al. 1994).
Along with the other adductors, adductor magnus is triangular. However, its surface area is gigantic in size compared to the other adductors. The muscles originate from the ischial tuberosities, inferior rami and the ischium on each side of the pelvis and its proximal, upper body sits deeper to the adductor brevis when viewed from the anterior. The adductor magnus has two insertions at the adductor tubercle on the medial femoral condyle and the medial linea aspera, with a gap on the linea aspera just at the distal shaft, which separates the two insertion points. Because of this muscles’ unique shape and incomplete separation of its portions, some have considered it as two separate muscles, a. magnus and a. minimus (Platzer 2004). It is possible that the basal adductor magnus shapes in earlier tetrapods forms have left traces of ancestral fibers in the human knee (Eizenberg et al. 2008).
The gracilis is the most superficial muscle of the medial compartment and part of the pes anserinus. It is a thin, yet broad band that begins from the lateral pubic symphysis, along the inferior ramus and tapers at its distal body. Its insertions attach at the medial superior tibial shaft, distal to condyle and just beneath the sartorius’ insertions, via pes anserinus. The gracilis muscle is used in several various types of transplant surgeries (Pickrell et al. 1952, Zmora et al. 2003, Vigato et al. 2007) including facial reconstruction (John Hopkins Medicine). The topics and descriptions of the pectineus muscles are summarized in the hip flexion summary.
Posterior Compartments of the Deep Buttock
The quadratus femoris is a quadrilateral muscle that originates from the posterior border of the pelvis’ ischial tuberosities. It is deeper than the superficial hamstring origins and sits between the inferior gemellus and the upper adductor magnus. The quadratus femoris’ flat body inserts at the femoral intertrochanteric crest. Case studies of inflammation (Klinkert et al. 1997), tears (O’Brien & Bui-Mansfield 2007) or impingement (Kassarjian 2008, Torriani et al. 2009, Lee et al. 2013) of the quadratus femoris has shown that this muscle can be a contribution to groin pain in patients. The topics and descriptions regarding the superior and inferior gemelli are summarized in the hip extension summary.
Muscle Overview - Hip Adductors
Figure 1. Sketch of the right hip adductors, anterior view (left) and posterior view (right).
Adductor longus 
Adductor brevis 
Adductor magnus 
Superior gemellus 
Inferior gemellus 
Quadratus femoris 
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Kevin B. Rosenbloom, C.Ped, Sports Biomechanist
Kevin B. Rosenbloom, founder and president of Kevin Orthopedic, is a renowned certified pedorthist and sports biomechanist practicing in Santa Monica, CA. With his continuing research on the historical development of foot and ankle pathologies, comparative evolution of lower extremities and the modern environmental impacts on ambulation, he provides advanced biomechanical solutions for his patients and clients.