Logan Steele
The hip joint is a ball-and-socket joint that connects the thigh bone (femur) to the hip bone (pelvis). It is a central pivot point for the body, allowing movement and stability. The hip joint enables triplanar movement in three major axes: the transverse axis, which permits flexion and extension; the longitudinal axis, which allows for internal and external rotation; and the sagittal axis, which enables abduction and adduction. The hip muscles, such as the gluteus maximus and medius, the tensor fasciae latae, and the iliopsoas group, play a crucial role in these movements and maintaining posture. Understanding hip anatomy is essential for diagnosing and treating musculoskeletal impairments and maintaining hip health through exercise, stretching, and a balanced diet.
| Characteristics | Values |
|---|---|
| Hip joint movement axes | Transverse axis (flexion and extension), longitudinal axis (internal and external rotation), sagittal axis (abduction and adduction) |
| Hip joint functions | Connects the lower extremities with the axial skeleton, facilitates weight-bearing, and enables upper leg movement |
| Hip muscles | Gluteals, adductor muscles, iliopsoas muscle, quadriceps, hamstrings, psoas major, psoas minor, iliacus, gluteus maximus, gluteus medius, gluteus minimus, tensor fasciae latae, piriformis, obturator internus, obturator externus, gemellus superior, gemellus inferior, quadratus femoris |
| Iliopsoas muscles function | Flexes and laterally flexes the trunk, flexes and laterally rotates the thigh at the hip joint |
| Psoas major | Long, thick, and fusiform muscle that lies lateral to the lumbar vertebrae and medial to the quadratus lumborum |
| Psoas minor | Long, thin, and fusiform muscle that lies anterior to the psoas major, present in about 40% of people |
| Iliacus | Large, triangular/fan-shaped muscle that lies over the ilium, receives innervation from the femoral nerve (L2-L4) |
| Hip flexor muscles | Help lift the leg and bend the knee, situated at the front of the hip |
| Hip extensors | Engage in activities like standing up, climbing uphill, ascending stairs, or pushing heavy objects |
| Hip rotators | Engage in twisting movements in golf swings, ballet, or sharp turns while walking |
| Hip adductors | Bring the legs together during movements like swimming breaststroke, located on the inner side of the thigh (groin) |
| Hip abductors | Engage in activities like side-stepping and balancing on one leg, located on the outer side of the hip and buttock |
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What You'll Learn
Hip extension and flexion
Hip flexion and extension are two fundamental movements of the hip joint. Hip flexion is required for activities such as walking, running, squatting, and jumping. This movement involves bringing the knee up towards the chest. The muscles involved in hip flexion include the iliopsoas, rectus femoris, and tensor fasciae latae.
On the other hand, hip extension is used for activities such as standing up from a seated position and climbing stairs. Hip extension occurs when you extend or "open" your hip joint, lengthening the front of your hip and increasing the angle between the pelvis and thigh. The main muscles involved in hip extension are the gluteus maximus, hamstrings (including the long head of the biceps femoris, semitendinosus, and semimembranosus), and the posterior head of the adductor magnus.
Weak hip extensors can cause issues with gait and stability. Sitting for long periods of time can contribute to weak hip extensors and tight hip flexor muscles, a condition known as Lower Crossed Syndrome (LCS). Hip extension exercises are important for strengthening the muscles around the hips, improving flexibility, balance, and athletic performance.
To improve hip flexion and extension, various exercises can be performed. For hip flexion, one can lie on their back with legs straight out and alternately bend their knees towards their chest. For hip extension, exercises such as the glute bridge, where one lies on their back with knees bent and feet flat on the ground, can be beneficial.
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Hip adduction and abduction
The hip joint allows movement in three major axes, all perpendicular to one another. The sagittal axis, or forward-backward axis, allows for abduction and adduction. Hip abduction occurs when the femur moves outward to the side, as in the movement of taking the thighs apart. Hip adduction, on the other hand, occurs when the femur moves back to the midline, towards the body's centre line.
Hip abductors are the main movers for lower-body abduction exercises. Located on the outside of the hips, this muscle group includes the gluteus medius, gluteus minimus, and tensor fasciae latae. These muscles help move the leg away from the body and rotate the leg at the hip joint. The gluteus maximus, gluteus medius, gluteus minimus, and tensor fasciae latae muscles are the large and superficial gluteal muscles. They have a variety of functions on the hip joint, including extension, external and internal rotation, and abduction and adduction of the thigh at the hip joint.
The hip adductors are mostly on the inside of the legs and include the adductor brevis, adductor longus, adductor magnus, obturator externus, and gracilis. The adductor group is responsible for hip adduction. The psoas is the primary hip flexor, assisted by the iliacus. The pectineus, the adductors longus, brevis, and magnus, as well as the tensor fasciae latae, are also involved in flexion. The gluteus maximus is the main hip extensor, but the inferior portion of the adductor magnus also plays a role. Medial rotation is performed by the gluteus medius and gluteus minimus, as well as the tensor fasciae latae and assisted by the adductors brevis and longus and the superior portion of the adductor magnus.
Hip abductors and adductors play a key role in stabilising the pelvis. If one of these muscle groups is not strong enough, lower back pain may develop. Training the hip abductors and adductors can help prevent injuries and strengthen the hips. Hip abduction and adduction machines are available at gyms, but exercises such as side-leg raises, lateral lunges, clamshells, and side plank hip abduction can also be performed.
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Hip rotation
The hip muscles can be divided into three main groups, with multiple muscles contributing to hip movements. The psoas is the primary hip flexor, with assistance from the iliacus. The psoas major and psoas minor laterally flex the trunk, while the iliacus is a large triangular muscle that lies over the ilium and functions to flex the trunk, hip, and externally rotate the thigh. The psoas major is a long, thick muscle that passes through the pelvis and extends to the thighbone, assisting with external rotation.
The gluteal muscles, including the gluteus maximus, gluteus medius, gluteus minimus, and tensor fasciae latae, are also involved in hip movements. The gluteus maximus is the main hip extensor, while the gluteus medius and gluteus minimus contribute to medial rotation. The tensor fasciae latae is involved in both flexion and medial rotation.
The inner hip muscles, such as the piriformis, obturator internus, obturator externus, gemellus superior, and gemellus inferior, are responsible for external rotation and pelvis stabilization.
To improve hip rotation, specific exercises can be performed. One exercise involves standing with the weight on the left leg and the right knee lifted. Keeping the knee in place, slowly swing the lower leg across the midline for external rotation, and then swing it to the outside for internal rotation. This exercise helps improve the range of motion in the hips.
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Hip muscles and ligaments
The hip joint connects the lower extremities with the axial skeleton, allowing movement in three major axes: the transverse axis (flexion and extension movement), the longitudinal axis (internal and external rotation), and the sagittal axis (abduction and adduction). The hip joint also facilitates weight-bearing and stability.
Hip muscles encompass several muscles of the hip and thigh, whose main function is to act on the thigh at the hip joint and stabilize the pelvis. Walking, for example, would be impossible without the hip muscles. They can be divided into three main groups: the iliopsoas group, the small and deep muscles, and the large and superficial gluteal muscles.
The iliopsoas group includes the iliacus, psoas major, and psoas minor muscles. The iliacus is a large triangular muscle that lies over the ilium, receiving innervation from the femoral nerve (L2-L4). It functions to flex the trunk and hip and externally rotate the thigh. The psoas major is a long, thick muscle that lies lateral to the lumbar vertebrae and medial to the quadratus lumborum. It originates from the T12-L4 vertebrae and fuses with the iliacus muscle. The psoas minor, on the other hand, is a long, thin muscle present in about 40% of people. It has the same innervation and function as the psoas major.
The small and deep muscles, also known as the inner hip muscles and deep external rotators, include the piriformis, obturator internus, obturator externus, gemellus superior, gemellus inferior, and quadratus femoris.
The large and superficial gluteal muscles are the gluteus maximus, gluteus medius, gluteus minimus, and tensor fasciae latae. These muscles have a variety of functions, including extension, external and internal rotation, and abduction and adduction of the thigh at the hip joint.
In addition to the muscles, hip ligaments also play a crucial role in hip function and stability. Ligaments connect bones, providing stability and support to the hip joint. The iliofemoral ligament, also known as the Y ligament of Bigelow, is the strongest ligament in the body. It lies on the anterior aspect of the hip joint and prevents hyperextension. The pubofemoral ligament is located in the front part of the hip joint capsule and limits hip abduction and excessive extension. The ischiofemoral ligament is the weakest of the three ligaments mentioned here and forms the posterior hip joint capsule. It attaches to the ischium and the base of the greater trochanter, preventing excess extension.
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Hip joint anatomy
The hip joint is a ball-and-socket joint that connects the lower extremities with the axial skeleton, allowing movement in three major axes: the transverse axis (flexion and extension movement), the longitudinal axis (internal and external rotation), and the sagittal axis (abduction and adduction). The hip joint also facilitates weight-bearing and stability.
The hip joint connects the thigh bone (femur) to the hip bone (pelvis). The hip muscles can be grouped based on their functions relative to hip movement. The iliopsoas group, for example, includes the iliacus, psoas major, and psoas minor muscles. The psoas major and psoas minor laterally flex the trunk, while the iliacus flexes the trunk, hip, and externally rotates the thigh. The iliopsoas muscle is the main flexor of the thigh.
The gluteal muscles can be divided into two groups: large and superficial muscles, and small and deep muscles. The large and superficial muscles include the gluteus maximus, gluteus medius, gluteus minimus, and tensor fasciae latae, which are responsible for abducting and extending the thigh at the hip joint. The small and deep muscles include the piriformis, obturator internus, obturator externus, gemellus superior, gemellus inferior, and quadratus femoris, which externally rotate the thigh at the hip joint and stabilise the pelvis.
The adductor group muscles are responsible for hip adduction, bringing the leg towards the body's midline. The gracilis, the most superficial and medial of the adductor group muscles, crosses both the hip and knee joints and induces movement at both. The adductor longus is a large, flat muscle that covers the adductor magnus and adductor brevis, and is responsible for adduction and medial rotation of the thigh. The adductor magnus is the largest and most posterior of the adductor group muscles.
Other muscles that contribute to hip movement include the hamstrings, which assist with hip extension, and the rectus femoris and sartorius, which primarily move the knee and are not generally classified as hip muscles.
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Frequently asked questions
The hip joint connects the lower extremities with the axial skeleton, joining the thigh bone (femur) with the hip bone (pelvis). The hip muscles include the iliopsoas group of muscles, which includes the iliacus, psoas major, and psoas minor. Other hip muscles include the gluteus maximus, gluteus medius, gluteus minimus, and tensor fasciae latae.
The hip muscles are responsible for multiple functions, including flexion, extension, abduction, adduction, and internal and external rotation. They also play a role in maintaining standing posture and stabilizing the pelvis.
Hip flexion occurs when the thighs are brought close to the abdomen. The psoas is the primary hip flexor, assisted by the iliacus and other muscles.
Hip extension is the movement opposite to flexion, where the legs move away from the abdomen. The gluteus maximus is the main hip extensor, with assistance from the adductor magnus.
Common injuries or conditions involving the hip muscles include hip strains, bursitis, dislocation, a broken femur, osteoarthritis, osteoporosis, and hip dysplasia. Maintaining hip health involves exercising, stretching, maintaining a healthy weight, and wearing protective equipment during physical activities.
