Logan Steele
Hip flexors are a group of muscles that allow you to lift your knee toward your chest and bend forward at the hip. They are essential in movement as they are used every time you stand, take a step, climb stairs, run, or ride a bicycle. The five key hip flexor muscles are the iliopsoas (iliacus and psoas major), pectineus, rectus femoris, and sartorius. Hip flexors can become tight and weak due to prolonged sitting, which can lead to a limited range of motion, poor posture, lower back or hip pain, and injuries. To prevent this, it is important to regularly stretch and strengthen the hip flexor muscles.
| Characteristics | Values |
|---|---|
| Definition | Muscles that flex (or bend) the hip. |
| Muscle Groups | Iliopsoas, rectus femoris, sartorius, tensor fasciae latae, iliacus, psoas, pectineus, and iliocapsularis. |
| Function | Hip flexion, lateral flexion of the torso, stabilising the lumbar spine, and raising the legs. |
| Injuries | Strains, tears, tendinosis, and bursitis. |
| Injury Causes | Overuse, eccentric hip flexion, explosive movements, and falls. |
| Symptoms | Pain, swelling, tenderness, and limping. |
| Treatment | Restraint from physical activity, stretching, and strengthening exercises. |
| Prevention | Regular movement, muscle conditioning, and stretching. |
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Hip flexor muscles
The hip flexor muscles are a group of muscles situated near the top of the thighs that allow you to lift your knee toward your chest and bend forward at the hip. These muscles get a workout whenever you perform movements like climbing stairs, running, or riding a bicycle. Hip flexors can also be exercised through activities like yoga and lunges.
The hip flexors consist of five key muscles that contribute to hip flexion: iliacus, psoas, pectineus, rectus femoris, and sartorius. The iliacus and psoas 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. The psoas major is a deep muscle that connects the legs to the spine, running from the lower back to the pelvis and attaching to the top of the femur. The iliacus is a flat, triangular muscle situated deep within the pelvis that attaches the pelvis to the femur. Its primary action is to flex and rotate the thigh.
Tight hip flexor muscles can lead to a limited range of motion, poor posture, lower back or hip pain, and injuries. This can be caused by a sedentary lifestyle, where the muscles are only activated when standing or moving. Weak hip flexors can also be more prone to strain and injury. Hip flexor strains can be graded, with Grade 1 being a small tear with mild pain and Grade 3 being a complete tear with severe swelling and pain.
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Hip flexor injuries
The hip flexors are a group of muscles situated near the top of the thighs that allow you to lift your knee toward your chest and bend forward at the hip. The hip flexor muscles include the iliopsoas (iliacus and psoas major muscles), sartorius, pectineus, and rectus femoris muscles. These muscles are engaged in everyday movements such as walking, running, climbing stairs, sitting, and squatting.
The chief symptom of a strained or torn hip flexor is pain where the hip meets the thigh, and symptoms can vary in severity. A grade 1 injury is a small tear with mild pain and minor swelling, while a grade 2 injury involves a larger tear with moderate pain and more significant swelling and limping. A complete tear causes severe pain and swelling, and walking becomes extremely difficult.
If you experience a hip flexor strain, it is important to rest and avoid activities that cause pain for at least 10 to 14 days. Applying ice for 20 minutes every 3 to 4 hours during the initial 2 to 3 days can help reduce pain and swelling, and gentle stretching exercises can aid in recovery and prevent future injuries. In more severe cases, your doctor may recommend physical therapy or, very rarely, surgery to repair a ruptured muscle.
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Iliopsoas
The iliopsoas is a large compound muscle of the inner hip, composed of the iliacus and psoas major muscles. The psoas minor muscle is also sometimes included as part of the iliopsoas muscle complex, although it is only present in 60-65% of individuals. The iliopsoas is the primary hip flexor and is essential for correct standing or sitting lumbar posture, stabilising the coxofemoral joint, and is crucial during walking and running.
The psoas major is a thick and 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 joins the fibres from the iliacus to form the large iliopsoas muscle. The iliopsoas ends in a tendon that inserts into the lesser trochanter of the femur.
The iliacus is a triangular-shaped muscle that originates from the upper two-thirds of the iliac fossa, the iliac crest, and the lateral aspect of the sacrum. Its fibres merge with the most lateral fibres of the psoas major to form the iliopsoas muscle. The iliopsoas tendon is separated from the hip joint by a large subtendinous iliac bursa.
Tight hip flexor muscles can lead to a limited range of motion, poor posture, lower back or hip pain, and injuries. Sitting for long periods can cause the hip flexor muscles to shorten and tighten, leading to functional problems such as anterior pelvic tilt and lumbar hyperlordosis. Strains, tears, tendinosis, and bursitis of the iliopsoas muscle can all present similarly, with symptoms including groin and/or proximal medial thigh pain.
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Rectus femoris
The rectus femoris is a fusiform-shaped muscle with bipenniform fibres located in the middle of the front of the thigh. It is one of the four quadriceps muscles, the others being the vastus medialis, vastus intermedius, and vastus lateralis. The rectus femoris is the only muscle in the quadriceps group that crosses the hip. It is also the most superior of the quadriceps muscles.
The rectus femoris is a two-way acting muscle, as it crosses over the hip and knee joints. It functions to extend the knee and assists the iliopsoas in flexing the hip. It is a direct antagonist to the hamstrings at the hip and knee. The muscle is involved in activities involving forceful knee extension, such as kicking a soccer ball, and is hence also known as the "kicking muscle".
The rectus femoris is prone to injury, as it crosses both the knee and the hip. 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 could be a full tear. The injury is caused by a forceful movement related to sprinting, jumping, or kicking and is common in sports like football or soccer. Symptoms include a sudden sharp pain at the front of the hip or in the groin, swelling and bruising, and an inability to contract the rectus femoris with a full tear.
The muscle is innervated by the femoral nerve, originating from lumbar nerve roots L2 to L4. Blood is supplied to the rectus femoris via the descending branch of the lateral circumflex femoral (LCF) artery.
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Hip flexor stretches
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 hip flexor muscles include the iliacus, pectineus, psoas major, rectus femoris, and sartorius.
Sitting for long periods of time can cause the hip flexors to tighten and shorten, leading to stiffness, discomfort, and lower back pain. To prevent this, it is important to get up and move around throughout the day. In addition, here are some hip flexor stretches that can help:
Couch Stretch
The couch stretch is a useful exercise to stretch the hip flexors. It involves kneeling on the floor with your left foot flat in front of you and your right knee on the floor behind you. Keep your trunk tall and use your hands on your left knee for balance. Gently slide your right knee back until you feel a stretch in the front of your hip. Squeeze your right glute and tuck your hips slightly, creating a pelvic tilt. Hold this pose for 10-30 seconds.
Kneeling Hip Flexor Stretch
Begin by kneeling on the floor with your right leg in front of you and your left knee on the floor behind you. Your right thigh should be parallel to the floor, with your knee bent at a 90-degree angle and your foot flat on the floor. Keep your left shin pointing straight back. Slowly and gently pull your right foot with your right hand, bringing your leg around behind you while keeping your pelvis tucked under. You should feel a stretch in the front of your thighs and your right hip flexor. Hold the stretch for 30 seconds and then switch sides.
Lying Down Hip Flexor Stretch
Lie down flat on your back with your arms at your sides, knees bent, and feet on the floor, hip-distance apart. Position your feet so that your fingers can touch your heels. While squeezing your glutes, press into your heels and lift your hips off the floor toward the ceiling. Hold this position for a few seconds before returning to the starting position, and repeat several times.
Seated Hip Flexor Stretch
Sit on the floor with your legs extended in front of you. Bend your right leg and place your hands behind your knee. Gently pull your leg towards your chest. Hold the stretch for 10-30 seconds, and then repeat on the other side.
In addition to these stretches, strengthening the glutes, hamstrings, abductors, and adductors can help to balance out hip mobility and improve the positioning of the pelvis.
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