Hip Muscles

The hip muscles are the muscles that act across the hip joint to move the femur relative to the pelvis or, when the lower limb is fixed, to control movement of the pelvis and trunk. They produce flexion, extension, abduction, adduction, medial rotation, and lateral rotation of the hip and are essential for standing, walking, running, climbing, and maintaining balance.

The hip is surrounded by several functional groups rather than a single anatomical muscle compartment. Major contributors include the gluteal muscles, iliopsoas, tensor fasciae latae, short lateral rotators, adductor muscles, and several muscles of the thigh that cross the hip joint.

Because the hip transmits body weight between the axial skeleton and lower limb, its muscles also have an important stabilizing function. During single-leg support, for example, the hip abductors generate forces that help prevent the unsupported side of the pelvis from dropping.

Functional Groups of Hip Muscles

Movement	Major Muscles
Flexion	Iliopsoas, rectus femoris, sartorius, tensor fasciae latae, pectineus
Extension	Gluteus maximus, hamstrings, hamstring part of adductor magnus
Abduction	Gluteus medius, gluteus minimus, tensor fasciae latae
Adduction	Adductor longus, adductor brevis, adductor magnus, gracilis, pectineus
Medial rotation	Anterior fibers of gluteus medius and minimus, tensor fasciae latae
Lateral rotation	Gluteus maximus, piriformis, obturator internus, obturator externus, gemelli, quadratus femoris

Gluteal Region

The gluteal region contains large superficial muscles responsible for powerful movement and stabilization of the hip together with a deeper group of smaller muscles that primarily produce lateral rotation and stabilize the femoral head.

The principal superficial muscles are gluteus maximus, gluteus medius, gluteus minimus, and tensor fasciae latae.

Gluteus Maximus

The gluteus maximus is the largest and most superficial muscle of the gluteal region. It is a powerful extensor of the hip and is particularly active when forceful extension is required, such as rising from a seated position, climbing stairs, running, or ascending a slope.

Feature	Gluteus Maximus
Origin	Posterior ilium, dorsal surfaces of sacrum and coccyx, sacrotuberous ligament, and associated fascia
Insertion	Iliotibial tract and gluteal tuberosity of femur
Action	Extends and laterally rotates hip; assists stabilization through iliotibial tract
Innervation	Inferior gluteal nerve

Actions of Gluteus Maximus

Gluteus maximus is particularly important for powerful hip extension. It is less active during relaxed level walking than during activities requiring substantial extension force.

Its upper fibers can assist abduction, while its lower fibers can contribute to adduction. The muscle also produces lateral rotation of the femur.

Gluteus Maximus and the Iliotibial Tract

A large portion of gluteus maximus inserts into the iliotibial tract, a thickened lateral portion of the fascia lata. Through this attachment, gluteus maximus contributes to stabilization of the hip and knee during weight bearing.

Gluteus Medius

The gluteus medius lies deep to gluteus maximus over the lateral surface of the ilium. It is one of the most important muscles for maintaining pelvic stability during walking.

Feature	Gluteus Medius
Origin	External surface of ilium between anterior and posterior gluteal lines
Insertion	Lateral surface of greater trochanter
Action	Abducts hip; assists medial rotation; stabilizes pelvis during single-leg support
Innervation	Superior gluteal nerve

Gluteus Medius and Pelvic Stability

When one foot is lifted from the ground, gluteus medius on the weight-bearing side contracts to help prevent the opposite side of the pelvis from dropping.

This function is essential during the single-support portion of normal gait.

Gluteus Minimus

The gluteus minimus lies deep to gluteus medius and is the smallest of the three muscles named gluteus. Its functions overlap substantially with those of gluteus medius.

Feature	Gluteus Minimus
Origin	External surface of ilium between anterior and inferior gluteal lines
Insertion	Anterior surface of greater trochanter
Action	Abducts and medially rotates hip; assists pelvic stabilization
Innervation	Superior gluteal nerve

Tensor Fasciae Latae

The tensor fasciae latae is a relatively small muscle located on the anterolateral aspect of the hip. It inserts into the iliotibial tract rather than directly onto the femur.

Feature	Tensor Fasciae Latae
Origin	Anterior superior iliac spine and adjacent anterior iliac crest
Insertion	Iliotibial tract
Action	Flexes, abducts, and medially rotates hip; helps stabilize pelvis and knee
Innervation	Superior gluteal nerve

Iliopsoas

The iliopsoas is the principal flexor of the hip. It is formed primarily by the psoas major and iliacus, which have separate proximal attachments but join distally and insert onto the lesser trochanter of the femur.

Psoas Major

The psoas major is a long muscle extending from the lumbar vertebral region to the proximal femur.

Feature	Psoas Major
Origin	Vertebral bodies, intervertebral discs, and transverse processes in the lumbar region
Insertion	Lesser trochanter through iliopsoas tendon
Action	Powerful hip flexion; can assist movement and stabilization of lumbar spine when femur is fixed
Innervation	Anterior rami of lumbar spinal nerves

Iliacus

The iliacus occupies the iliac fossa and joins psoas major as the muscles pass toward the proximal femur.

Feature	Iliacus
Origin	Iliac fossa and adjacent internal surface of ilium
Insertion	Lesser trochanter with psoas major
Action	Flexes hip
Innervation	Femoral nerve

Iliopsoas Function

Iliopsoas produces powerful flexion of the femur at the hip. When the lower limbs are fixed, bilateral contraction can contribute to flexion of the trunk relative to the thighs.

Because of its position anterior to the hip joint, iliopsoas also contributes to dynamic control and stabilization of the joint.

Short Lateral Rotators

A group of relatively small muscles lies deep in the gluteal region. These muscles are collectively referred to as the short lateral rotators of the hip.

They include piriformis, obturator internus, superior gemellus, inferior gemellus, quadratus femoris, and obturator externus.

Piriformis

The piriformis arises from the anterior surface of the sacrum, passes through the greater sciatic foramen, and inserts onto the greater trochanter.

Feature	Piriformis
Origin	Anterior surface of sacrum
Insertion	Superior border of greater trochanter
Action	Laterally rotates extended hip; assists abduction of flexed hip; stabilizes femoral head
Innervation	Nerve to piriformis

Piriformis as an Anatomical Landmark

Piriformis divides the greater sciatic foramen into suprapiriform and infrapiriform spaces and is therefore an important landmark for nerves and vessels entering the gluteal region.

The superior gluteal neurovascular bundle normally passes superior to piriformis, while the sciatic nerve and several other major structures usually emerge inferior to it.

Obturator Internus

The obturator internus arises from the internal surface of the obturator membrane and surrounding bone. Its tendon makes a sharp turn through the lesser sciatic foramen before reaching the femur.

Feature	Obturator Internus
Origin	Pelvic surface of obturator membrane and surrounding bone
Insertion	Medial surface of greater trochanter
Action	Laterally rotates extended hip, abducts flexed hip, stabilizes femoral head
Innervation	Nerve to obturator internus

Superior Gemellus

The superior gemellus is a small muscle arising from the ischial spine. It joins the tendon of obturator internus and contributes to lateral rotation and stabilization of the hip.

Feature	Superior Gemellus
Origin	Ischial spine
Insertion	With obturator internus tendon onto medial aspect of greater trochanter
Action	Lateral rotation of extended hip and abduction of flexed hip
Innervation	Nerve to obturator internus

Inferior Gemellus

The inferior gemellus lies inferior to the obturator internus tendon and arises from the ischial tuberosity.

Feature	Inferior Gemellus
Origin	Ischial tuberosity
Insertion	With obturator internus tendon onto medial aspect of greater trochanter
Action	Lateral rotation of extended hip and abduction of flexed hip
Innervation	Nerve to quadratus femoris

Quadratus Femoris

The quadratus femoris is a short, rectangular muscle extending horizontally from the ischium to the proximal femur.

Feature	Quadratus Femoris
Origin	Lateral border of ischial tuberosity
Insertion	Quadrate tubercle and adjacent intertrochanteric crest
Action	Laterally rotates hip and assists adduction
Innervation	Nerve to quadratus femoris

Obturator Externus

The obturator externus lies primarily in the medial thigh but functions as one of the short lateral rotators of the hip. Its tendon passes posterior to the femoral neck to reach the trochanteric fossa.

Feature	Obturator Externus
Origin	External surface of obturator membrane and surrounding pubis and ischium
Insertion	Trochanteric fossa
Action	Laterally rotates hip and stabilizes femoral head
Innervation	Obturator nerve

Role of the Short Lateral Rotators

Although named primarily for their rotational action, the short lateral rotators are also important dynamic stabilizers of the femoral head within the acetabulum.

Their short lengths and close relationship to the joint allow them to generate compressive and directional forces that help control the proximal femur.

Hip Adductors

The medial thigh contains the principal adductors of the hip. These include adductor longus, adductor brevis, adductor magnus, gracilis, and pectineus.

Adductor Longus

Feature	Adductor Longus
Origin	Body of pubis inferior to pubic crest
Insertion	Middle third of linea aspera
Action	Adducts thigh and assists hip flexion
Innervation	Obturator nerve

Adductor Brevis

Feature	Adductor Brevis
Origin	Body and inferior ramus of pubis
Insertion	Pectineal line and proximal linea aspera
Action	Adducts thigh and assists hip flexion
Innervation	Obturator nerve

Adductor Magnus

The adductor magnus is a large muscle with functionally distinct adductor and hamstring portions.

Part	Major Action	Innervation
Adductor part	Adducts and assists flexion of thigh	Obturator nerve
Hamstring part	Extends thigh	Tibial division of sciatic nerve

Gracilis

The gracilis is a long superficial muscle of the medial thigh. It crosses both the hip and knee joints.

Feature	Gracilis
Origin	Body and inferior ramus of pubis
Insertion	Superomedial surface of tibia as part of pes anserinus
Action	Adducts thigh; flexes knee and assists medial rotation of leg
Innervation	Obturator nerve

Pectineus

The pectineus occupies a transitional position between the anterior and medial compartments of the thigh.

Feature	Pectineus
Origin	Pecten pubis and adjacent superior pubic ramus
Insertion	Pectineal line of femur
Action	Adducts and flexes hip
Innervation	Primarily femoral nerve, with variable additional innervation

Hamstrings Acting at the Hip

The hamstrings cross the posterior aspect of the hip and are important extensors of the thigh. The major muscles contributing to hip extension are semitendinosus, semimembranosus, and the long head of biceps femoris.

Semitendinosus

Semitendinosus arises from the ischial tuberosity and extends the hip while also flexing the knee and medially rotating the flexed leg.

Semimembranosus

Semimembranosus arises from the ischial tuberosity and contributes to hip extension, knee flexion, and medial rotation of the flexed leg.

Biceps Femoris Long Head

The long head of biceps femoris arises from the ischial tuberosity and contributes to extension of the hip. Both heads of biceps femoris act at the knee, but only the long head crosses the hip joint.

Rectus Femoris

Rectus femoris is the only quadriceps muscle that crosses both the hip and knee. It assists hip flexion while serving as a powerful knee extensor.

Sartorius

Sartorius crosses the anterior aspect of the hip and contributes to a combination of flexion, abduction, and lateral rotation of the thigh. It also flexes the knee.

Hip Flexion

Hip flexion decreases the angle between the anterior thigh and trunk. Iliopsoas is the principal muscular flexor, assisted by rectus femoris, sartorius, tensor fasciae latae, pectineus, and portions of the adductor group.

Hip Extension

Hip extension is produced principally by gluteus maximus and the hamstrings, with assistance from the hamstring portion of adductor magnus.

Gluteus maximus becomes particularly important when extension is performed against substantial resistance or from a flexed position.

Hip Abduction

The principal abductors are gluteus medius and gluteus minimus, assisted by tensor fasciae latae. Abduction is important not only for moving the limb laterally but also for maintaining pelvic alignment during unilateral weight bearing.

Hip Adduction

The adductor group of the medial thigh produces adduction. Adductor magnus provides substantial force because of its large cross-sectional area, while adductor longus, adductor brevis, gracilis, and pectineus also contribute.

Hip Medial Rotation

Medial rotation is produced primarily by the anterior portions of gluteus medius and gluteus minimus together with tensor fasciae latae. The exact rotational contribution of individual muscles can vary with hip position.

Hip Lateral Rotation

Lateral rotation is produced by gluteus maximus and the deep short lateral rotators. Sartorius and other muscles can assist depending on joint position.

Muscle Actions Change with Hip Position

The mechanical action of a hip muscle is influenced by the position of the femur relative to the pelvis. As the hip moves, the muscle's line of pull relative to the joint axes can change.

Consequently, a muscle may have different rotational or abduction-adduction effects at different degrees of hip flexion.

Hip Muscles and Pelvic Control

When the femur is fixed, muscles crossing the hip can act on the pelvis rather than moving the thigh. This closed-chain function is essential during standing and locomotion.

Pelvic Stabilization During Single-Leg Stance

During single-leg stance, body weight creates a tendency for the unsupported side of the pelvis to descend. The hip abductors of the supporting limb, particularly gluteus medius and gluteus minimus, generate an opposing moment that helps maintain pelvic alignment.

Trendelenburg Sign

A positive Trendelenburg sign can occur when the hip abductors on the supporting side are weak or their innervation is impaired. When the patient stands on the affected limb, the pelvis may drop on the unsupported side.

Trendelenburg Gait

Abductor insufficiency can produce an altered gait pattern. A person may compensate by shifting the trunk toward the affected supporting hip, reducing the mechanical demand placed on the weakened abductors.

Superior Gluteal Nerve

The superior gluteal nerve supplies gluteus medius, gluteus minimus, and tensor fasciae latae.

Damage to this nerve can impair hip abduction and pelvic stabilization during walking.

Inferior Gluteal Nerve

The inferior gluteal nerve supplies gluteus maximus. Injury can weaken powerful hip extension and make activities such as climbing stairs or rising from a seated position more difficult.

Obturator Nerve

The obturator nerve provides motor innervation to most muscles of the medial thigh and is therefore the principal nerve associated with hip adduction.

Femoral Nerve

The femoral nerve supplies iliacus, sartorius, rectus femoris, and typically pectineus. These muscles contribute to hip flexion in addition to their other functions.

Sciatic Nerve

The tibial division of the sciatic nerve supplies the hamstring muscles responsible for a substantial portion of hip extension. The sciatic nerve passes through the gluteal region in close relationship to the deep hip muscles.

Motor Innervation Summary

Nerve	Major Hip Muscles Supplied
Superior gluteal nerve	Gluteus medius, gluteus minimus, tensor fasciae latae
Inferior gluteal nerve	Gluteus maximus
Femoral nerve	Iliacus, sartorius, rectus femoris, usually pectineus
Obturator nerve	Majority of adductor group and obturator externus
Sciatic nerve	Hamstrings and hamstring part of adductor magnus through tibial division
Direct sacral plexus branches	Piriformis, obturator internus, gemelli, quadratus femoris

Blood Supply

The muscles around the hip receive blood from several arterial systems, particularly branches of the superior and inferior gluteal arteries, medial and lateral circumflex femoral arteries, obturator artery, and profunda femoris artery.

Superior Gluteal Artery

The superior gluteal artery supplies much of the superior gluteal region, including gluteus medius and gluteus minimus.

Inferior Gluteal Artery

The inferior gluteal artery supplies structures in the inferior gluteal region and contributes to the vascular supply of gluteus maximus and nearby deep muscles.

Medial Circumflex Femoral Artery

The medial circumflex femoral artery passes through the proximal thigh and contributes importantly to the vascular networks around the hip. Its branches are particularly important to the blood supply of the femoral head and neck.

Lateral Circumflex Femoral Artery

The lateral circumflex femoral artery supplies portions of the anterior and lateral proximal thigh and participates in arterial anastomoses around the hip.

Gluteal Anastomoses

Branches of the gluteal and femoral arterial systems communicate around the hip and proximal femur, creating collateral vascular pathways.

Hip Muscles During Walking

The hip muscles act throughout the gait cycle to control movement of the femur, stabilize the pelvis, absorb forces, and generate propulsion.

Hip Extensors During Early Stance

Hip extensors help control the relationship between the trunk and thigh after initial contact and contribute to stabilization as body weight is transferred onto the limb.

Hip Abductors During Stance

Gluteus medius and gluteus minimus become particularly important during single-limb support because they counter the tendency of the pelvis to drop toward the unsupported side.

Hip Flexors During Swing

Hip flexors accelerate the thigh forward as the limb enters swing. Iliopsoas is a major contributor to this movement.

Hip Muscles During Running

Running requires larger and more rapid muscular forces than walking. Gluteus maximus contributes strongly to propulsion and control of the trunk, while the abductors stabilize the pelvis and the flexors rapidly advance the limb.

Hip Muscles During Stair Climbing

Climbing stairs requires substantial hip extension to elevate the body. Gluteus maximus and the hamstrings therefore become particularly important during ascent.

Hip Muscles During Rising from Sitting

Standing from a seated position requires powerful extension of the flexed hip. Gluteus maximus is a major contributor, assisted by the hamstrings and other extensors.

Hip Muscles and Posture

Hip muscles influence the position of the pelvis and therefore indirectly affect alignment of the lumbar spine and lower limbs. Balanced activity between flexors, extensors, abductors, adductors, and rotators contributes to postural control.

Anterior Pelvic Tilt

Muscles capable of flexing the hip or acting on the lumbar spine can contribute to anterior pelvic rotation when acting under appropriate fixed-limb conditions. Their effect depends on the position of the body and activity of opposing muscle groups.

Posterior Pelvic Tilt

Hip extensors, particularly gluteus maximus and the hamstrings, can contribute to posterior rotation of the pelvis when the femur is fixed.

Hip Muscle Synergies

Normal movement rarely depends on a single muscle. Hip muscles function in coordinated groups, with agonists producing movement, antagonists controlling it, and stabilizers maintaining alignment of the pelvis and femoral head.

Hip Joint Stabilization

The hip possesses substantial inherent stability because of the depth of the acetabulum, acetabular labrum, strong capsule, and surrounding ligaments. Muscular forces provide additional dynamic stability.

Dynamic Stabilization of the Femoral Head

The gluteal muscles and short rotators help maintain controlled positioning of the femoral head during movement. The deep rotators are particularly well positioned to generate compressive forces across the articulation.

Hip Muscle Weakness

Weakness of individual hip muscle groups can alter gait and lower limb mechanics. Abductor weakness may compromise pelvic control, extensor weakness can impair stair climbing and rising, and flexor weakness can interfere with advancement of the limb during swing.

Gluteus Maximus Weakness

Weakness of gluteus maximus can make forceful hip extension difficult. During walking, compensatory posterior movement of the trunk may be used to reduce the flexion moment at the hip.

Hip Abductor Weakness

Weakness of gluteus medius and minimus reduces the ability to maintain a level pelvis during single-leg stance and may produce a Trendelenburg pattern.

Iliopsoas Weakness

Weakness of iliopsoas reduces the ability to flex the thigh forcefully and may interfere with advancing the lower limb during activities requiring rapid or resisted hip flexion.

Adductor Weakness

Weakness of the adductor group can impair control of the thigh in the frontal plane and reduce force during movements that require drawing the lower limb toward the body's midline.

Muscle Strains

Hip muscles can be injured by sudden acceleration, forceful eccentric loading, overstretching, direct trauma, or repetitive activity. Common sites include the hamstrings, adductors, rectus femoris, and hip flexor muscles.

Adductor Strain

Adductor strains commonly involve muscles near the proximal medial thigh and can occur during activities requiring rapid changes of direction, kicking, or forceful abduction against active adductor tension.

Hip Flexor Strain

Hip flexor strains may involve iliopsoas, rectus femoris, or related muscles and can occur during sprinting, kicking, or repetitive high-force hip flexion.

Gluteal Tendinopathy

Tendons of gluteus medius and gluteus minimus can develop degenerative or painful changes near their insertions around the greater trochanter.

Greater Trochanteric Pain

Pain around the lateral hip may involve the gluteal tendons, bursae, and surrounding structures. The anatomy of gluteus medius and minimus is particularly important in understanding this region.

Iliopsoas Bursa

The iliopsoas bursa lies between the iliopsoas musculotendinous region and the anterior hip structures. Enlargement or inflammation can produce symptoms in the anterior hip or groin region.

Trochanteric Bursae

Several bursae reduce friction between the greater trochanter and overlying tendons or muscles. The trochanteric bursa associated with gluteus maximus and the lateral greater trochanter is clinically important.

Piriformis and the Sciatic Nerve

The sciatic nerve usually passes inferior to piriformis, although anatomical variations occur. Their close anatomical relationship is important when evaluating symptoms arising in the deep gluteal region.

Intramuscular Injection in the Gluteal Region

The relationship of the gluteal muscles to major nerves and vessels is important when selecting sites for intramuscular injection. The ventrogluteal region uses anatomical landmarks over gluteus medius and is separated from the major sciatic neurovascular structures.

Muscle Testing

Hip muscle function can be assessed by applying resistance to specific movements while stabilizing the pelvis and observing for substitution by other muscle groups.

Testing Hip Flexion

Resisted hip flexion primarily evaluates the hip flexor group, particularly iliopsoas, although several additional muscles contribute.

Testing Hip Extension

Hip extension can be tested against resistance with attention to gluteus maximus and hamstring contribution. Knee position can influence the mechanical contribution of the hamstrings.

Testing Hip Abduction

Resisted hip abduction assesses gluteus medius and gluteus minimus together with tensor fasciae latae. Pelvic position should be controlled to reduce compensatory trunk movement.

Testing Hip Adduction

Resisted movement of the thigh toward the midline assesses the adductor group, including adductor longus, brevis, and magnus.

Testing Hip Rotation

Resisted medial and lateral rotation can be used to assess the rotational muscle groups, although multiple muscles contribute and their mechanical roles change with hip position.

Summary of Major Hip Muscles

Muscle	Major Action	Innervation
Gluteus maximus	Extension and lateral rotation	Inferior gluteal nerve
Gluteus medius	Abduction and pelvic stabilization	Superior gluteal nerve
Gluteus minimus	Abduction and medial rotation	Superior gluteal nerve
Tensor fasciae latae	Flexion, abduction and medial rotation	Superior gluteal nerve
Iliopsoas	Hip flexion	Femoral nerve and lumbar anterior rami
Piriformis	Lateral rotation and stabilization	Nerve to piriformis
Obturator internus	Lateral rotation and stabilization	Nerve to obturator internus
Superior gemellus	Lateral rotation	Nerve to obturator internus
Inferior gemellus	Lateral rotation	Nerve to quadratus femoris
Quadratus femoris	Lateral rotation and adduction	Nerve to quadratus femoris
Obturator externus	Lateral rotation	Obturator nerve
Adductors	Hip adduction	Primarily obturator nerve
Hamstrings	Hip extension	Tibial division of sciatic nerve

Key Anatomical Features

Feature	Key Point
Principal hip flexor	Iliopsoas
Powerful hip extensor	Gluteus maximus
Principal abductors	Gluteus medius and gluteus minimus
Principal adductor group	Adductor longus, brevis, magnus, gracilis and pectineus
Major lateral rotators	Gluteus maximus and short lateral rotators
Major pelvic stabilizers	Gluteus medius and minimus
Gluteus maximus nerve	Inferior gluteal nerve
Gluteus medius and minimus nerve	Superior gluteal nerve
Major adductor nerve	Obturator nerve
Major hip flexor nerve supply	Femoral nerve and direct lumbar anterior rami
Major functions	Movement, pelvic control, joint stabilization, balance and locomotion

Anatomical and Functional Importance

The muscles surrounding the hip create a highly coordinated system capable of producing powerful movement while maintaining stability of one of the body's major weight-bearing joints. Their functions depend not only on their attachments but also on the position of the hip and whether the femur or pelvis is acting as the relatively fixed segment.

The large superficial muscles generate substantial forces for locomotion. Gluteus maximus provides powerful extension, while gluteus medius and minimus are essential for controlling the pelvis during unilateral weight bearing. Iliopsoas provides powerful hip flexion, and the medial thigh muscles generate adduction and contribute to control of the femur.

The short lateral rotators form a deeper stabilizing system around the posterior hip. Their close relationship to the joint allows them to control rotation and assist in maintaining the femoral head within the acetabulum during movement.

Understanding the hip muscles is therefore fundamental to the anatomy of hip movement, gluteal anatomy, pelvic stability, gait, lower limb biomechanics, Trendelenburg sign, hip muscle weakness, peripheral nerve lesions, and muscular injuries of the hip and thigh.