Dominic Stone
The hip joint is a multiaxial synovial joint that allows for a wide range of movements. The muscles that extend the hip are primarily the gluteus maximus, the ischiocondylar part of the adductor magnus, the semimembranosus, the semitendinosus, and the biceps femoris. The gluteus maximus is the largest and most powerful muscle in this group, contributing more than 75% of the total power output. The tensor fasciae latae is another muscle that extends the hip and is the only muscle in its group that crosses the knee joint.
| Characteristics | Values |
|---|---|
| Hip Extensors | gluteus maximus, adductor magnus, biceps femoris, semitendinosus, semimembranosus |
| Hip Flexors | iliopsoas, rectus femoris, sartorius, gracilis, psoas major, iliacus, pectineus |
| Hip Abduction | gluteus medius, gluteus minimus, obturator externus, gemelli, sartorius |
| Hip Adduction | adductor group (adductor brevis, longus, magnus, pectineus, gracilis) |
| Hip Rotation | gluteus medius, gluteus minimus, tensor fasciae latae, lateral rotator group (externus and internus obturators, piriformis, superior and inferior gemelli, quadratus femoris) |
| Hip Extension Assistance | abdominal muscles |
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Gluteus maximus
The gluteus maximus is the outermost muscle of the buttocks. It is the largest and most superficial of the three gluteal muscles, enveloped by a thin fascia that separates it from the adjacent subcutaneous tissue. The gluteus maximus is a tensor of the fascia lata, and by its connection with the iliotibial band, it steadies the femur on the articular surfaces of the tibia during standing. This muscle is responsible for several actions at the hip joint, including extension, external rotation, abduction, and adduction of the thigh.
The gluteus maximus originates from several sites, including the posterior gluteal line of the outer upper ilium, a pelvis bone, and the iliac crest. It also arises from below the lower part of the sacrum and the side of the coccyx, or tailbone. The muscle fibres take an inferolateral course, converging towards the femur. The gluteus maximus is innervated by the inferior gluteal nerve (L5-S2) and vascularised by the muscular branches of the inferior and superior gluteal arteries.
The main function of the gluteus maximus is as the chief anti-gravity muscle during sitting, counteracting and controlling hip flexion. It acts as the main extensor of the hip joint when its proximal attachment is fixed, pulling the shaft of the femur posteriorly. This extension action is particularly important in various sports, such as running and weightlifting. The gluteus maximus is also involved in external rotation, abduction, and adduction of the thigh, with the superior part producing abduction and the inferior part causing adduction.
The gluteus maximus is associated with three bursae: the trochanteric, ischial, and gluteofemoral bursae. The trochanteric bursa separates the muscle from the greater trochanter, while the ischial bursa separates it from the ischial tuberosity. The gluteofemoral bursa is found between the tendon of the gluteus maximus and the vastus lateralis.
Injuries to the gluteus maximus can be assessed through functional assessments such as the 30-second chair-to-stand test, which measures strength, flexibility, pain, and endurance. The piriformis test is also used to measure the flexibility of the gluteus maximus by evaluating the external and internal rotation range of motion.
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Adductor magnus
The adductor magnus is a large, powerful muscle of the medial compartment of the thigh. It is a composite muscle, consisting of two parts: the adductor part (or pubofemoral part) and the ischiocondylar part. The adductor part can be further divided into superior and inferior portions, which originate from the pubic ramus and the ischial ramus, respectively. The adductor magnus muscle is the largest and strongest muscle of the medial compartment of the thigh, which also includes the adductor longus, adductor brevis, pectineus, and gracilis muscles.
The adductor magnus muscle is a massive triangular muscle that extends over the entire medial side of the thigh, with its apex situated on the hip bone and its base on the linea aspera of the femur. The upper, lateral part of the adductor magnus is sometimes considered a separate muscle, known as the adductor minimus. This portion of the muscle lies adjacent to the quadratus femoris muscle, and they may be fused together or separated by a gap that allows the passage of the circumflex artery.
The adductor magnus muscle has a dual nerve supply, with the adductor portion innervated by the posterior division of the obturator nerve and the hamstring portion innervated by the sciatic nerve. The muscle is a dynamic stabiliser of the pelvis and femur, and it plays a similar role to the deltoid muscle. One portion of the adductor magnus flexes the thigh and acts as a medial rotator, while the other portion extends the thigh, acts as a lateral rotator, and adducts the thigh. The muscle's function as a hip extensor is particularly notable when the hip is flexed, such as during full squats.
Adductor tendinopathy is a common issue among athletes, especially in sports such as ice hockey and football, predominantly affecting male athletes. The adductor magnus is also associated with adductor canal syndrome, an unusual cause of acute arterial occlusion in younger men. This syndrome is the result of arterial compression by an abnormal musculotendinous band arising from the adductor magnus muscle.
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Hamstring muscles
The hamstring muscle group is comprised of three muscles: the biceps femoris, semitendinosus, and semimembranosus. These muscles are skeletal muscles located at the back of the thigh, starting at the pelvis and extending to the knee. They are innervated by nerves that arise from the lumbar and sacral plexuses, which give rise to the sciatic nerve. The hamstring muscles are essential for many daily activities, including walking, climbing stairs, and squatting. They also play a critical role in more explosive actions such as sprinting and jumping.
The biceps femoris is located on the outside of the back of the thigh. Its function is to flex the knee, extend the thigh at the hip, and rotate the lower leg from side to side when the knee is bent. The semitendinosus is the longest muscle in the hamstring group and is located between the semimembranosus and biceps femoris. It shares the same function as the semimembranosus. The semimembranosus is located on the innermost side of the back of the thigh and, in addition to the functions mentioned above, it also rotates the hip and lower leg.
The hamstring muscles are very susceptible to injury, especially in athletes who run and sprint. A common hamstring injury is called a "pulled hamstring" or strain, which can range from mild to severe. To avoid injuring your hamstrings, it is important to stretch, warm up, and not push through pain in your hip, knee, and leg.
The hamstring muscles also play a role in stabilising the knee joint. They work together with the anterior cruciate ligament (ACL) to resist the anterior translation of the tibia during the heel strike phase of the gait cycle. Additionally, during the swing phase of walking, the hamstrings decelerate the forward motion of the tibia.
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Hip joint muscles
The hip joint muscles are a group of muscles that cause movement at the hip joint. These muscles are responsible for various functions, including extension, external and internal rotation, abduction, and adduction of the thigh at the hip joint.
The gluteus maximus is the largest and most superficial muscle of the gluteal group. It is responsible for extending the hip and assisting with lateral rotation and abduction of the thigh. It also stabilizes the hip and knee joints through its influence on the iliotibial tract. The gluteus maximus is the most powerful muscle in the extensor group, contributing more than 75% of the total power output.
The hamstring muscles, including the long head of the biceps femoris, semimembranosus, and semitendinosus, are also primary hip extensors. The adductor magnus, a large and powerful adductor muscle, is another effective extensor of the hip, similar to the hamstring muscles.
The gluteus medius and gluteus minimus are involved in hip abduction and internal rotation. The gluteus medius is a fan-shaped muscle that helps stabilize the pelvis during walking. The gluteus minimus has a similar function and lies deep to the gluteus medius.
The tensor fasciae latae is a fusiform-shaped muscle and the most anterior of the gluteal muscle group. It assists in internal rotation and weak abduction of the thigh at the hip joint. It also stabilizes the hip and knee joints.
The iliopsoas group of muscles, including the iliacus and psoas major, is responsible for hip flexion. The rectus femoris is another powerful hip flexor but is dependent on the position of the knee and hip.
The hip joint muscles work together to provide stability and a wide range of movements, contributing to our overall mobility and functional abilities.
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Hip flexors
The hip flexors are a group of muscles responsible for flexing the hip, or bringing the leg upward toward the body. The primary hip flexors are the psoas major (originating from the lower six vertebrae of the spine) and the iliacus (originating from the inside bowl of the pelvis), which, collectively, are often called the iliopsoas. The iliopsoas is the body's most important hip flexor. The rectus femoris and sartorius are also hip flexors.
The iliopsoas works to stabilise the trunk during activities such as lifting, pushing, and pulling. It also draws the knees toward the chest, for example, when swinging a leg forward when running or kicking a football.
Tight hip flexors can cause the pelvis to tilt and make it harder for the pelvis to rotate properly, which can lead to lower back pain, hip pain, and injury. Spending a lot of time sitting, whether at a desk, in a car, or on the couch, puts the hip flexors in a compressed position, causing them to shorten and tighten up. This can be counteracted by getting up and moving more throughout the day, for example, by changing position every 30 to 45 minutes, standing up, walking around, or performing a quick stretch. Yoga poses, glute bridges, planks, crunches, and clamshells can also help keep the glutes, core, and piriformis strong, which will help improve hip strength and mobility.
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Frequently asked questions
The gluteus maximus is the muscle responsible for extending the hip.
Yes, the adductor magnus, the biceps femoris, the semimembranosus, and the semitendinosus also contribute to hip extension.
The gluteus maximus is the largest and most superficial muscle of the gluteal group, giving structure to the buttocks.
The adductor magnus is the largest and most posterior of the adductor group of muscles. It adducts, flexes, and extends the thigh.
The biceps femoris is similar to the biceps brachii in the upper arm and has two synergistic muscles: the semitendinosus and the semimembranosus. It extends and laterally rotates the hip.
