Logan Steele
The hip joint is a ball and socket joint that is the point of articulation between the head of the femur and the pelvis. Twenty-one muscles cross the hip joint, working with the hip tendons and ligaments to enable movement in various directions. These muscles are divided into two main categories: the muscles of the hip joint and the muscles of the hip girdle. The muscles of the hip joint facilitate the movement of the hip joint, while the muscles of the hip girdle offer stability and support to the hip joint. The hip muscles are further divided into four groups according to their orientation around the hip joint: the gluteal group, the lateral rotator group, the adductor group, and the iliopsoas group.
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What You'll Learn
Hip flexors, extensors, abductors, adductors, and rotators
The hip muscles are divided into four groups: the gluteal group, the lateral rotator group, the adductor group, and the iliopsoas group. The muscles in these groups are responsible for movements like flexion, extension, abduction, adduction, and rotation.
Hip Flexors
The iliopsoas group, comprising the iliacus and psoas major, is the body's most important hip flexor. The psoas major is a large muscle that runs from the L1 to L5 vertebrae and connects to the femur. The iliacus originates on the iliac fossa of the ilium and joins the psoas major via its tendon. The pectineus and rectus femoris are also hip flexors.
Hip Extensors
The gluteus maximus is the primary hip extensor, with the hamstrings and the extensor head of the adductor magnus also considered primary extensors. These muscles produce the greatest torque across the hip. Sports that use hip extensors maximally include ice skating, sprint racing, running, cycling, uphill walking, and swimming.
Hip Abductors
The hip abductor muscle group is located on the lateral thigh and includes the gluteus medius, gluteus minimus, and tensor fasciae latae as primary abductors. The secondary hip abductors include the piriformis, sartorius, and superior fibres of the gluteus maximus. Hip abduction occurs when the femur moves outward to the side, and these muscles help stabilise the hip during walking and running.
Hip Adductors
The hip adductors are the muscles in the medial compartment of the thigh. There are four primary muscles in this group: adductor longus, adductor brevis, adductor magnus, and gracilis. These muscles function to move the thigh or lower extremity closer to the body's central axis. The pectineus muscle assists in this movement and also plays a role in hip flexion.
Hip Rotators
The lateral rotator group consists of six small muscles that externally rotate the femur in the hip joint: piriformis, gemellus superior, obturator internus, gemellus inferior, quadratus femoris, and obturator externus. The gluteus medius and gluteus minimus are also involved in hip rotation, along with the tensor fasciae latae and adductors.
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Hip joint and hip girdle muscles
The hip joint is a ball and socket joint that connects the head of the femur and the pelvis. The hip joint is the second-largest weight-bearing joint and is a multiaxial joint, allowing a wide range of motion, including flexion, extension, abduction, adduction, external rotation, internal rotation, and circumduction.
The hip muscles can be divided into two main categories: the muscles of the hip joint and the muscles of the hip girdle. The muscles of the hip joint facilitate the movement of the hip joint, while the muscles of the hip girdle offer stability and support to the hip joint.
The muscles of the hip joint include the gluteus maximus, gluteus medius, gluteus minimus, and tensor fasciae latae. These muscles are responsible for extension, external and internal rotation, abduction, and adduction of the thigh at the hip joint. The gluteus maximus is the largest muscle in the body and forms most of the muscle of the buttocks. The gluteus medius and gluteus minimus are located on the side of the hip and are responsible for abduction, preventing swaying of the hips, and stabilising the pelvic region. The tensor fasciae latae is located on the outer side of the hip and is responsible for flexion, abduction, and internal rotation of the hip joint.
The iliopsoas group of muscles, including the iliacus and psoas major, is also associated with the hip joint. The iliopsoas flexes the hip joint and is crucial for walking, running, and other lower-body movements. The psoas major is a large muscle that runs from the L1 to L5 vertebrae and connects to the femur. The iliacus originates on the iliac fossa of the ilium and joins with the psoas major via its tendon.
The hip girdle muscles include the adductor muscles, located on the inner thigh, which are responsible for adduction, or the movement of bringing the legs closer to the abdomen. The piriformis muscle, situated deep in the buttock region, assists with external rotation of the hip joint.
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Iliopsoas group
The iliopsoas group is a combination of the iliacus and the psoas major muscles. These muscles are commonly referred to as the "iliopsoas". The iliopsoas is a large compound muscle of the inner hip. The iliopsoas is a major hip flexor that helps move the spine. The iliopsoas is the strongest flexor of the hip joint.
The iliacus is a large triangular-shaped muscle that lies over the surface of the ilium. Its fibres merge with the fibres of the psoas major muscle around the inguinal ligament to form the iliopsoas muscle. The iliacus receives its innervation from the femoral nerve (L2-L4) and functions to flex the trunk, hip, and externally rotate the thigh. The iliacus muscle is innervated by branches of the femoral nerve (L2, L3).
The psoas major is a long, thick, and fusiform muscle that lies lateral to the lumbar vertebrae and medial to quadratus lumborum. It is a powerful muscle situated on the posterior abdominal wall, lateral to the vertebral column. It originates from the transverse processes of all the lumbar vertebrae, the anterolateral surfaces of the bodies of T12-L5 vertebrae, and the interposed intervertebral discs. The psoas major is innervated by direct branches of the lumbar plexus, specifically from L1-L3.
The iliopsoas muscle is formed by the merging of the fibres of the psoas major and iliacus muscles. The iliopsoas passes anterior to the capsule of the hip joint to insert onto the lesser trochanter of the femur. The iliopsoas tendon is separated from the hip joint by a large subtendinous iliac bursa, which helps it move over the front of the hip during movement.
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Hip injuries and treatment
The hip joint is a multiaxial joint that allows a wide range of motion, including flexion, extension, abduction, adduction, external rotation, internal rotation, and circumduction. The hip is the juncture of the leg and the pelvis and is the second-largest weight-bearing joint in the body. The hip muscles play a pivotal role in lower body movement and stability.
Hip injuries are extremely common in people of all ages. Athletes, seniors, and people carrying extra weight are at a particularly high risk of hip injuries. The most common causes of hip pain and injury include arthritis, injuries, bursitis, structural abnormalities, and bone fractures. Structural abnormalities include conditions that affect the shape of the hips, such as femoroacetabular impingement (FAI) and developmental dysplasia of the hip (DDH). FAI occurs when the hip moves and the leg bone rubs against the pincer lesion, which can crush the labrum—a cushioning agent between the femoral neck and the acetabulum.
Hip injuries can also be caused by repetitive strain, sports injuries, and traumas like falls or car accidents. Some common hip injuries include hip muscle strains, iliotibial band syndrome, hip labral tears, and hip dislocations. For mild symptoms, rest, ice application, and over-the-counter pain relievers can help alleviate discomfort. However, for more severe injuries, it is important to consult a healthcare professional for a comprehensive diagnosis and appropriate treatment, such as physical therapy or medication.
To prevent hip injuries, it is important to maintain a balanced exercise routine, warm up before physical activity, use proper form and technique during exercises, and gradually increase the intensity and duration of workouts. Strengthening and stretching the hip muscles can also help prevent injuries, improve athletic performance, and maintain overall hip health.
In conclusion, hip injuries are common but can be effectively treated and prevented through proper diagnosis, rehabilitation, and proactive strengthening and stretching of the hip muscles.
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Hip ligaments and tendons
The hip is a complex joint that permits a wide range of motion. It is formed by the interaction of ligaments, tendons, and muscles. Tendons are tough fibrous bands that connect the ends of muscles to bone, facilitating muscle movement. Ligaments are soft tissue structures that connect bones to bones, providing stability and support to the hip joint.
The hip joint is a multiaxial joint, allowing for a wide range of motion, including flexion, extension, abduction, adduction, external rotation, internal rotation, and circumduction. The hip joint is surrounded by thick muscles, including the gluteals, which form the muscles of the buttocks, and the adductor muscles, which form the inner thigh. The iliopsoas muscle, a combination of the iliacus and psoas major, is another important muscle of the hip.
The hip joint capsule is formed by a group of three strong ligaments that connect the femoral head to the acetabulum, providing stability to the hip. These ligaments are the iliofemoral, pubofemoral, and ischiofemoral ligaments. The pubofemoral ligament is located in the front part of the hip joint capsule and limits hip abduction, while the ischiofemoral ligament is located in the posterior part of the hip joint capsule and limits excessive internal rotation and adduction.
Another important ligament is the zona orbicularis (annular ligament), which surrounds the femoral head within the acetabulum (hip socket) and forms a locking ring, ensuring joint stability during weight-bearing activities. The ligamentum teres is a pyramidal-shaped ligament that connects the acetabulum to the femoral head from inside the joint, providing stability by limiting excessive movement. It also contains a small artery that supplies blood to the femoral head.
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Frequently asked questions
Hip muscles are a group of muscles that cross the hip joint and enable hip movement in various directions. There are 17-21 hip muscles, which are divided into four groups: the gluteal group, the lateral rotator group, the adductor group, and the iliopsoas group.
The hip muscles are responsible for hip flexion, extension, abduction, adduction, external rotation, internal rotation, and circumduction. They also provide stability and support to the hip joint.
The main hip muscle groups are the gluteal group, which includes the gluteus maximus, gluteus medius, gluteus minimus, and tensor fasciae latae; the lateral rotator group, which includes the piriformis; the adductor group, which includes the pectineus, adductors longus, brevis, and magnus; and the iliopsoas group, which includes the iliacus and psoas major.
A common hip muscle injury is hip flexor pain or discomfort. This can be treated with rest, ice, and over-the-counter pain relievers for mild symptoms. For more severe injuries, it is recommended to consult a healthcare professional for proper diagnosis and treatment, such as physical therapy or medication.
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