Victor Forge
Hip flexors are a group of muscles situated near the top of your thighs that allow you to lift your knee toward your chest and bend forward at the hip. These muscles are essential in movement as you use them every time you stand or take a step. They also help maintain your stability and posture. Hip flexors include the iliopsoas, rectus femoris, sartorius, and tensor fasciae latae. The psoas major and iliacus muscles are often grouped together as the iliopsoas musculotendinous unit due to their overlapping functions and anatomic proximity. The iliopsoas is the body's most important hip flexor. Prolonged sitting puts the hips in a constant state of supported flexion, causing the muscles to shorten and become tight, which can lead to functional problems.
| Characteristics | Values |
|---|---|
| Definition | Muscles responsible for flexing the hip and raising the legs |
| Group | Iliopsoas, rectus femoris, sartorius, tensor fasciae latae, pectineus, iliacus, psoas major |
| Location | Near the top of the thighs |
| Function | Allow you to lift your knee toward your chest and bend forward at the hip |
| Injury | Hip flexor strain, where one or more of the muscles are stretched or torn |
| Injury Causes | Extreme stress from explosive movements like jumping or running |
| Injury Symptoms | Pain, swelling, bruising, cramping, muscle spasms |
| Injury Prevention | Regular movement and muscle conditioning |
| Sitting | Sitting too long can shorten and tighten hip flexor muscles |
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What You'll Learn
Iliacus and psoas muscles
The iliopsoas is a powerful hip flexor and the body's most important one. It is a complex muscle system that can function as a unit or as separate muscles. The iliopsoas muscle is made up of three muscles: the iliacus, psoas major, and psoas minor. The psoas minor is only present in about 60% of individuals.
The iliacus muscle has a fan-shaped triangular shape that occupies the internal iliac fossa. It originates on the upper two-thirds of the iliac fossa, on the medial edge of the iliac crest, on the ilium-lumbar ligament, and blends with the bundles of the quadratus lumborum muscle. It also originates on the base of the sacrum, the anterior capsule of the hip joint, and the anterior iliac spines. The iliacus muscle is a triangular sheet that connects the ilium bone to the lesser trochanter.
The psoas muscle is a long, ribbon-shaped muscle deep in the core of the body. There is one psoas muscle on either side of the spine. The psoas muscle originates at the lumbar transverse processes, the intervertebral discs, and the adjacent bodies from T12 to L5. The deeper segment of the psoas originates from the first four lumbar vertebrae, while the superficial segment originates from the lateral surface of the distal thoracic vertebrae and adjacent intervertebral discs. The psoas muscle is supported by the lumbar arteries, iliolumbar arteries, circumflex iliac artery, obturator artery, and femoral artery.
The iliacus and psoas muscles are often grouped together due to their overlapping functions and anatomic proximity. These muscles contribute to postural stability while standing erect and elevating the torso from a supine position. They also help maintain the strength and integrity of the hip joint. Sitting for long periods can shorten and tighten the iliopsoas, causing an anterior pelvic tilt.
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Rectus femoris
The rectus femoris is a hip flexor muscle and is part of the quadriceps group. It is the only muscle in the quadriceps group that crosses the hip. The muscle is located in the superior, anterior middle compartment of the thigh and is situated in the middle of the front of the thigh. The word rectus is derived from the Latin word for "straight", which describes how the muscle runs straight down the thigh. The rectus femoris is fusiform in shape, with superficial bipenniform fibres and deep, vertically oriented fibres.
The rectus femoris has two functions: flexing at the hip and extending the knee. It is engaged intensely when both functions are at play, such as when kicking a soccer ball or swinging a straight leg forward. The muscle is highly active during a soccer kick, especially when kicking across the body. The rectus femoris is also known as the "kicking muscle" due to its involvement in activities requiring forceful knee extension.
The muscle has two distinct origins proximally: the direct head and the reflected head. The direct head originates from the anterior inferior iliac spine, while the reflected head originates from a groove above the rim of the acetabulum. The two heads unite at an acute angle and spread into an aponeurosis that is prolonged downward on the anterior surface of the muscle, from which the muscular fibres arise. The rectus femoris is the anterior thigh compartment's most superficial and nearly vertically oriented muscle.
The rectus femoris is a weaker hip flexor when the knee is extended because it is already shortened and thus suffers from active insufficiency. The muscle is highly contracted in this state, and its ability to flex the hip is limited. Rectus femoris strain, referred to as hip flexor strain, is a common injury at the tendon that attaches to the patella or in the muscle itself. The injury is usually a partial tear but can also be a full tear, caused by a forceful movement related to sprinting, jumping, or kicking.
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Sartorius
The sartorius muscle is the longest muscle in the human body. It is a long, thin, superficial muscle that runs down the length of the thigh in the anterior compartment. The sartorius muscle originates from the anterior superior iliac spine and part of the notch between the anterior superior iliac spine and the anterior inferior iliac spine. It runs obliquely across the upper and anterior part of the thigh in an inferomedial direction. It passes behind the medial condyle of the femur to end in a tendon. This tendon curves anteriorly to join the tendons of the gracilis and semitendinosus muscles in the pes anserinus, where it inserts into the superomedial surface of the tibia.
The sartorius muscle is innervated by the femoral nerve. It may also originate from the outer end of the inguinal ligament, the notch of the ilium, the ilio-pectineal line, or the pubis. The muscle may be split into two parts, and one part may be inserted into the fascia lata, the femur, the ligament of the patella, or the tendon of the semitendinosus. The tendon of insertion may end in the fascia lata, the capsule of the knee joint, or the fascia of the leg. It is important to note that the sartorius muscle may be absent in some people.
At the hip, the sartorius muscle flexes, weakly abducts, and rotates the thigh laterally. At the knee, it can flex the leg, and when the knee is flexed, it also rotates the leg medially. The sartorius muscle plays a crucial role in stabilising the pelvis, especially in women. This stabilisation is due to the constrictive effect that the muscles on both sides of the body have on the pubic symphysis.
The name "sartorius" comes from the Latin word "sartor," meaning "tailor," and it is sometimes referred to as the "tailor's muscle." This name likely refers to the cross-legged position in which tailors once sat. Similarly, in French, an older name for this muscle is "couturier," which means "seamstress" or "dressmaker," also referencing the act of "sitting as a tailor." Other hypotheses for the name include the idea that it refers to the location of the inferior portion of the muscle, which is the "inseam" or area of the inner thigh that tailors commonly measure when fitting trousers. Another theory suggests that the muscle closely resembles a tailor's ribbon.
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Pectineus
The pectineus is a flat, quadrangular muscle located in the superomedial part of the anterior thigh. It is one of the muscles located on the medial thigh, alongside four primary large muscles: the adductor longus, adductor brevis, adductor magnus, and gracilis muscles. The pectineus is considered a transitional muscle between the anterior thigh and medial thigh. It is innervated by the femoral nerve (L2 and L3) and, in some cases, by the obturator nerve.
The pectineus muscle is involved in hip adduction and flexion, and it acts as a hip flexor and secondary adductor. It originates on the superior pubic ramus and inserts on the pectineal line of the femur. The muscle fibres pass downward, backward, and lateral, inserting into the posterior surface of the femur along the pectineal line and proximal part of the linea aspera. The pectineus is the most anterior adductor of the hip, and its primary action is hip flexion. It also contributes to adduction and external rotation of the hip.
The pectineus muscle plays a crucial role in stabilising the pelvis and balancing the trunk on the lower extremity during walking. It is a prime mover and a postural muscle. Activities that utilise the pectineus muscle include running, skating, kicking a soccer ball, and playing basketball.
Injuries to the pectineus muscle can occur during sporting activities or when the muscle is fatigued. Overstretching the muscle, such as by stretching the leg too far to the side or front of the body, can lead to a strain. Rapid movements like kicking or sprinting, changing directions too quickly while running, or even sitting with a leg crossed for an extended period, can also cause pectineus injuries. Treatment of a pectineus injury involves protecting the injured area, minimising activities that use the muscle, and applying ice to reduce swelling and pain.
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Iliopsoas
The iliopsoas is a powerful hip flexor muscle that is essential for correct lumbar posture, stabilising the coxofemoral joint, and is crucial during walking and running. It is the prime mover of hip flexion and the strongest of the hip flexors. The iliopsoas is formed from the psoas major muscle and the iliacus muscle, which are separate in the abdomen but usually merge in the thigh. The psoas minor also contributes to the iliopsoas muscle, although it is only present in 60-65% of individuals.
The iliopsoas is perfectly suited to anterior pelvic tilt and is the body's most important hip flexor. Sitting too long can shorten and tighten the iliopsoas, tilting the pelvis and changing how a person walks. The iliopsoas is a common site of bleeding in patients undergoing blood anticoagulation.
The iliopsoas musculotendinous unit (IPMU) is part of the inner muscles of the hip and forms part of the posterior abdominal wall. The IPMU creates multiple fascial connections, relating the muscle to different viscera and muscle areas. The iliopsoas is covered by the iliac fascia, which surrounds the psoas major muscle as it passes under the inguinal ligament.
The psoas major originates along the outer surfaces of the vertebral bodies of T12 and L1-L3/L4/L5 and their associated intervertebral discs. The iliacus originates in the iliac fossa of the pelvis. The psoas major unites with the iliacus at the level of the inguinal ligament. The two muscles then jointly insert at the lesser trochanter of the proximal femur.
The iliopsoas gets innervation from the L1-4 nerve roots of the lumbar plexus, which also send branches to the superficial lumbar muscles. The femoral nerve passes through the muscle and innervates the quadriceps, pectineus, and sartorius muscles.
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Frequently asked questions
Hip flexors are a group of muscles situated near the top of your thighs that allow you to lift your knee toward your chest and bend forward at the hip.
The primary hip flexors are the iliopsoas, rectus femoris, sartorius, pectineus, and tensor fasciae latae.
The iliopsoas is the body's most important hip flexor. It is composed of two muscles, the iliacus and psoas, which work together to flex the hip and thigh, as well as stabilise the torso.
Prolonged sitting can lead to shortened and tightened hip flexor muscles, a condition known as anterior pelvic tilt. This can cause low back pain, limited range of motion, poor posture, and increase the risk of injuries.
To prevent hip flexor injuries, it is important to keep these muscles strong and flexible through regular movement, stretching, and muscle conditioning exercises such as the bridge pose in yoga.
