Maximus Gage
The hip joint is a ball-and-socket joint that connects the head of the femur to the pelvis, and it is the second-largest weight-bearing joint in the body. The hip muscles are essential for lower body movement and stability, and they work in an integrated system with muscles of the shoulder, neck, core, lower leg, and supporting muscles of the spine. There are 5 major groups of hip muscles, each responsible for a specific type of hip movement. These include the hip flexors, extensors, abductors, adductors, and internal and external rotators.
| Characteristics | Values |
|---|---|
| Number of muscles crossing the hip | 21 |
| Hip joint | Ball and socket joint |
| Hip function | Stability, support, and movement |
| Hip movement | Flexion, extension, abduction, adduction, external rotation, internal rotation, and circumduction |
| Hip muscles | Iliopsoas, gluteus maximus, gluteus medius, gluteus minimus, tensor fasciae latae, piriformis, obturator internus, obturator externus, gemellus superior, gemellus inferior, quadratus femoris, rectus femoris, sartorius, pectineus, adductors longus, brevis, magnus, gracilis, psoas major, psoas minor, quadriceps femoris, vastus lateralis, vastus medialis, vastus intermedius |
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What You'll Learn
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 and the iliacus, which, collectively, are often called the iliopsoas. The psoas originates from the lower vertebrae of your spine, while the iliacus originates from the inside bowl of the pelvis. Together, they work to flex and stabilise the hip and pull the thigh and torso together when you walk, run, sit or stand.
The iliopsoas is the body's most important hip flexor. People who spend most of the day sitting down have shorter hip flexor muscles, tilting the pelvis, and changing the way a person walks. Sitting too long can cause the hip flexor muscles to shorten and tighten up. This can lead to functional problems, such as anterior pelvic tilt and lumbar hyperlordosis. Weak hip flexors can also cause lower back pain, hip pain, and injury.
Tight hip flexors can cause pain or discomfort in the front of the hip, which typically worsens with prolonged sitting or repetitive hip-flexion movements like running and cycling. Hip flexor exercises, including yoga poses, can help strengthen and relieve tension. Hip flexor stretches can also be performed to increase flexibility and mobility in the hip flexors.
Other muscles that act as hip flexors include the rectus femoris, the sartorius, and the pectineus. The rectus femoris is one of the quadriceps and has two functions: to flex at the hip and to extend the knee. The sartorius, the longest muscle in the body, crosses the hip and the knee joints. It originates at the anterior superior iliac spine and inserts superficially on the pes anserinus. The pectineus acts as a hip flexor and secondary adductor, originating on the superior pubic ramus and inserting on the pectineal line of the femur.
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Hip extensors
The hip extensors are a group of muscles that are primarily responsible for activities like jumping, running, and standing up. They play a key role in the upward and forward movement of the body and can also tilt the pelvis when the femur is stable. The hip extensor muscles are primarily active during the beginning of a stance and are used to prevent hip flexion. Paralysis of the hip extensor muscles can be managed by hyper-extending the hips, which is achieved by dorsiflexing the ankle, extending the knee, and hyper-extending the lumbar spine.
The gluteus maximus is the primary hip extensor. The hamstrings, which include the long head of the biceps femoris, the semitendinosus, and the semimembranosus, are also considered hip extensors. The extensor head of the adductor magnus is also considered a primary hip extensor. The adductor magnus is responsible for hip adduction and assists the gluteus maximus in hip extension. The gluteus maximus is the most powerful muscle in the extensor group, contributing more than 75% of the total power output.
Hip extension occurs when you extend or "open" your hip joint so that the angle between your pelvis and thigh increases. This can mean moving your leg behind you when standing or using the hip extensor muscles to propel your body forward over your leg when your leg starts flexed in front of you. It is involved in many daily movements, such as walking, standing up from a chair, and climbing stairs. It is also involved in many sports activities, such as running, jumping, kicking, sprint racing, cycling, uphill walking, and swimming.
Having strong hip extensor muscles can improve athletic performance, stabilize the pelvis and spine, and guide day-to-day movement. Weak hip extensor muscles may be a result of prolonged sitting and a sedentary lifestyle. To strengthen the hip extensors, it is recommended to incorporate hip extension exercises into one's workout routine, with a focus on proper form and adequate warm-up time.
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Hip abductors
The hip abductors are a group of muscles located on the lateral thigh. They are responsible for most of the forces on the hip while standing on one leg, which can be greater than body weight. These muscles include the gluteus medius, gluteus minimus, and tensor fasciae latae. The secondary hip abductors include the piriformis, sartorius, and superior fibres of the gluteus maximus.
The hip abductors are crucial for balance and athletic activity. They are responsible for moving the leg away from the body and rotating the leg at the hip joint. They also help to stabilise the pelvis and prevent it from dropping or sagging excessively to one side. This is especially important during walking, as the hip abductors of the stance leg must supply an adequate contraction force to keep the pelvis level. Weakness in these muscles can cause pain and interfere with proper movement, such as in the trendelenburg gait, where the hip abductors, especially the gluteal musculature, are weak.
Hip abduction strengthening exercises can help prevent and treat pain in the hips and knees. These exercises are often used in therapy settings and by bodybuilders and weightlifters to improve stability and prevent injuries. Some examples of these exercises include lying side leg lifts, clamshells, and banded side steps or squats.
The hip abductors are closely related to the core muscles and the muscles of the shoulder, neck, lower leg, and supporting muscles of the spine. They work together to provide the ability to stand with good posture and stability.
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Hip adductors
The adductor brevis is a short muscle that lies underneath the adductor longus. The gracilis is the most superficial and medial of the hip adductors, crossing both the hip and knee joints. The adductor magnus is the largest of the hip adductors and consists of two parts: the adductor part and the ischiocondylar (hamstring) part. The adductor part is considered part of the medial thigh compartment, while the hamstring part belongs to the posterior compartment of the thigh.
The hip adductors are located in the medial compartment of the thigh and are innervated by the obturator nerve, which arises from the lumbar plexus. They extend from the anteroinferior external surface of the bony pelvis to the shaft of the femur and proximal tibia. The main action of this group of muscles is to produce adduction of the thigh at the hip joint, pulling the thigh towards or past the median plane.
The adductor longus is the most anteriorly placed muscle of the adductor group, originating from the anterior surface of the body of the pubis. Its muscle fibres course downwards and laterally to insert onto the middle third of the linea aspera. The adductor brevis is a triangular muscle and the shortest of the adductors. The adductor magnus is a massive fan-shaped sheet of muscle and the largest of the hip adductors.
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Hip internal and external rotators
The hip joint is a ball-and-socket joint that connects the lower extremities with the axial skeleton. It allows movement in three major axes: the transverse axis, the longitudinal axis, and the sagittal axis. The hip joint also facilitates weight-bearing and hip stability. The hip muscles can be divided into three main groups, encompassing many muscles that act on the thigh at the hip joint and stabilize the pelvis.
The internal and external rotation of the hip is specifically permitted by the longitudinal axis, or vertically along the thigh. The hip muscles involved in internal and external rotation include the gluteus maximus, gluteus medius, gluteus minimus, and tensor fasciae latae. These muscles are also responsible for extension, abduction, and adduction of the thigh at the hip joint. The tensor fasciae latae is unique in that it is the only muscle in this group that crosses the knee joint, allowing it to act on the leg as well.
The piriformis, obturator internus, obturator externus, gemellus superior, gemellus inferior, and quadratus femoris are also involved in external rotation. These muscles are known as the inner hip muscles and deep external rotators.
The iliopsoas group of muscles, including the iliacus, psoas major, and psoas minor, also play a role in hip movement. The psoas major and minor laterally flex the trunk, while the iliacus flexes the trunk and hip and externally rotates the thigh.
Exercises to improve hip internal and external rotation include the 90-90 stretch, where one sits on the floor with both knees in a "90-90" or "pinwheel" shape. Another exercise is the externally rotated leg lift, where one places their hands on the floor for support and lifts their front leg away from the floor, lifting both the inside of the ankle and knee at the same time.
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Frequently asked questions
The hip muscles are a group of 21 muscles that cross the hip and enable movement in several directions. They include the gluteus maximus, medius, and minimus, the tensor fasciae latae, the iliopsoas (iliacus, psoas major, and psoas minor), the rectus femoris, the vastus lateralis, medialis, and intermedius, and the piriformis. They are responsible for hip flexion, extension, abduction, adduction, and internal and external rotation.
The hip muscles have several primary functions, including providing stability and support to the body, enabling a wide range of movements, and facilitating weight-bearing. They also play a role in maintaining an upright posture and preventing swaying of the hips.
Hip muscles facilitate many daily activities such as walking, sitting, standing up from a seated position, climbing stairs, kicking a ball, and lifting a leg to climb a ladder or get into bed. Hip adduction occurs when the femur moves towards the body's midline, as in crossing the legs or swimming. Hip abduction occurs when the femur moves outward and away from the body's midline, as in side-stepping or taking the thighs apart in a yoga posture.
