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The thigh muscles are some of the largest muscles in the human body and are responsible for several important functions, including bending, extending, and rotating the hips and knees. They also assist in maintaining balance and proper alignment of the legs and hips. Due to their crucial role in lower body movement, thigh muscles are susceptible to injuries, especially among athletes who participate in high-speed activities such as running and jumping. One common type of thigh muscle injury is a muscle strain, which occurs when a muscle is stretched beyond its limit, resulting in torn muscle fibres. To prevent and treat such injuries, it is essential to understand the different thigh muscles and their functions.
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What You'll Learn
Hamstrings
The hamstrings are a group of three large and powerful posterior thigh muscles: the semitendinosus, semimembranosus, and biceps femoris. They are responsible for extending the hip and flexing the knee, and they enable you to extend your hip to move your leg behind your body and to flex your knee, like when you squat. The hamstrings work together with the quadriceps muscles on the front of the thigh to straighten and bend the leg.
The hamstring muscles attach via a tendon to the ischial tuberosity (the sitting bone). Hamstring tendinopathy is an injury that occurs at the attachment of the hamstring muscles to the ischial tuberosity. It typically causes pain at the top of the leg and can be treated with ultrasound-guided injections of platelet-rich plasma (PRP) or corticosteroids. The concentrated platelet layer is injected into the damaged area, releasing "growth factors" that have regenerative and healing properties. Corticosteroid injections can also help reduce inflammation and swelling, but they are controversial as they can trigger a hamstring tear.
Hamstring muscles are prone to strain injuries, especially in athletes who participate in sports that involve sprinting and running, such as track and soccer. Muscle strains occur when a muscle is stretched beyond its limit, tearing the muscle fibres. A person with a hamstring strain will frequently describe a popping or snapping sensation as the muscle tears, along with sudden and severe pain. The area around the injury may be tender to the touch, with visible bruising if blood vessels are also broken. Swelling may extend below the thigh into the calf and ankle.
To treat a hamstring strain, many home treatments can be used, including natural supplements such as Glucosamine, MSM, Chondritin, Capsaicin, Devil's Claw, Arnica, or Yucca Leaf to help relieve pain and/or strengthen tissues. It is important to let the muscle heal properly and to follow preventive guidelines from a doctor.
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Adductors
The thigh muscles are located on the front, back, and inside of the thighs. They are responsible for bending and extending the hips and knees, balancing, and rotating the legs inward. The thigh muscles are prone to injury, especially in athletes, due to the strain caused by running, jumping, and changing directions.
In addition to adduction, the adductors also play a role in stabilizing the pelvis and maintaining balance during walking. They have secondary functions in hip flexion and rotation. The adductors originate on the pubis and ischium bones and insert mainly on the medial posterior surface of the femur. Most of the adductor muscles are innervated by the obturator nerve, with the exception of the pectineus muscle, which is innervated by the femoral nerve, and a small part of the adductor magnus, which is innervated by the tibial nerve.
Strains in the thigh muscles, including the adductors, can be quite painful. A muscle strain occurs when the muscle is stretched beyond its limit, resulting in tearing of the muscle fibres. This can cause a sudden and severe pain, tenderness, bruising, swelling, and even bleeding into the surrounding tissues. It is important to allow a strained muscle to heal properly and to follow the advice of a medical professional.
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Quadriceps
The quadriceps femoris is a group of muscles located at the front of the thigh. It is the most voluminous muscle in the human body. The quadriceps tendon connects to the kneecap (patella) and is composed of five muscle bellies. The four heads of the quadriceps femoris are powerful extensors of the knee joint, allowing you to straighten your knee and perform movements such as kicking, running, jumping, and walking. The rectus femoris, being a flexor of the hip, is crucial for swinging the leg forward during walking or running. The vastus medialis stabilizes the patella and the knee joint, while the tensor vastus intermedius is a newly identified part of the quadriceps femoris.
The quadriceps femoris is prone to injuries, especially in athletes who participate in sports involving sprinting, such as track and soccer. Strains, or "pulled quads," occur when the muscle fibers are overstretched, ranging from mild overstretching to severe tears that detach the quad tendon from the kneecap. Quadriceps contusions can also result from a direct blow to the front of the thigh, causing bruising or hematoma. Cuts or lacerations that break the skin can damage the quad muscles or tendons. To prevent injuries, it is important to warm up and stretch before physical activity and seek medical attention for persistent pain in the front of the thigh.
The rectus femoris originates from the anterior inferior iliac spine and the acetabulum, making it a biarticular muscle. The other parts of the quadriceps arise from the surface of the femur and insert into the tuberosity of the tibia through the patella. A small fifth muscle, the articularis genus, is sometimes included in the quadriceps complex. Cadaver studies have also revealed a sixth muscle, the tensor vastus intermedius, which originates at the proximal femur and inserts at the medial aspect of the patellar base.
The quadriceps femoris is a target for manual and physical therapy in the case of repetitive strain injuries, such as those sustained from skiing. Strength training exercises for the quadriceps include squats, leg presses, and leg extensions. The myoelectric balance of the quadriceps is essential for the correct movement of the patella and maintaining adequate posture. The activation of the proprioceptive afferents in the quadriceps improves coordination and postural balance.
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Pectineus
The pectineus muscle is a flat, quadrangular muscle, situated at the anterior (front) part of the upper and medial (inner) aspect of the thigh. It is considered a transitional muscle between the anterior thigh and medial thigh. The muscle's primary action is hip flexion, and it also produces adduction and external rotation of the hip. It can be classified in the medial compartment of the thigh when emphasising function, or the anterior compartment when emphasising nerve function.
The pectineus muscle arises from the pectineal line of the pubis and, to a lesser extent, the surface of the bone in front of it, between the iliopectineal eminence and pubic tubercle. The fibres pass downward, backward, and lateral, to be inserted into the pectineal line of the femur, which leads from the lesser trochanter to the linea aspera. The muscle then slides over the superior margin of the superior pubic ramus and courses posterolaterally down the thigh, sometimes being partially divided into a larger anterior (superficial) layer and a smaller posterior (deep) layer.
The pectineus muscle is innervated by the femoral nerve (L2 and L3) and, in some cases, a branch of the obturator nerve called the accessory obturator nerve. The femoral nerve is always present, providing the sole innervation for the pectineus muscle in over 90% of cases. The muscle is also innervated by the accessory obturator nerve in 8.7% of cases.
The pectineus muscle can become injured by overstretching, particularly by stretching a leg or legs too far out to the side or front of the body. Pectineus injuries can also be caused by rapid movements like kicking or sprinting, changing directions too quickly while running, or even sitting with a leg crossed for too long. Treatment of a pectineus muscle injury involves protecting the injured area, minimising activities that use the muscle, and icing the injury to decrease swelling and pain.
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Iliopsoas
The iliopsoas muscle is a large triangular-shaped muscle that lies over the surface of the ilium, lateral to the lower part of the psoas major and psoas minor muscles. It is the main flexor of the thigh. The iliopsoas muscle is formed from the psoas major muscle and the iliacus muscle, which are separate in the abdomen but usually merge in the thigh. The iliopsoas muscle joins to the femur at the lesser trochanter. It is the strongest flexor of the hip and is important for standing, walking, and running.
The iliopsoas muscle is classified as an "anterior hip muscle" or "inner hip muscle". It crosses the hip joint to insert on the lesser trochanter of the femur. The iliopsoas muscle is the prime mover of hip flexion and assists in external rotation of the hip joint, playing a crucial role in maintaining the strength and integrity of the hip joint. It is also important for correct standing or sitting lumbar posture, stabilising the coxofemoral joint.
The psoas major is a long, thick, and fusiform muscle that lies lateral to the lumbar vertebrae and medial to the quadratus lumborum. It originates from the T12-L4 vertebrae and descends to insert onto the lesser trochanter of the femur after fusing with the iliacus muscle. The psoas major flexes and laterally flexes the trunk and thigh at the hip joint.
The iliacus is a fan-shaped muscle that originates from the upper two-thirds of the iliac fossa and the lateral parts of the wing of the sacrum. Its bundles merge with the bundles of the psoas major muscle, and together they pass under the inguinal ligament and insert onto the femoral lesser trochanter. The iliopsoas muscle is supplied by the lumbar spinal nerves L1–L3 (psoas) and parts of the femoral nerve (iliacus).
The psoas minor is a long, thin, and fusiform muscle that lies anterior to the psoas major. It originates from T12 and L1 and is only present in about 40% of people. It has the same function as the psoas major. The psoas minor contributes to the iliopsoas muscle and forms part of the floor of the femoral triangle.
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Frequently asked questions
The thigh muscles are some of the largest muscles in the body, and they help to bend, flex, and rotate the lower body. They also bear most of the body's weight and help with balance.
The thigh muscles can be divided into three main groups based on their location: posterior, medial, and anterior. Posterior thigh muscles, such as the hamstrings, run down the back of the thigh. Medial thigh muscles, like the adductors, are on the inside of the thigh. Anterior thigh muscles, including the quadriceps, are located on the front of the thigh.
The hamstring and quadriceps muscle groups are particularly susceptible to muscle strains, especially in athletes who participate in sports that involve sprinting and quick direction changes, such as soccer and basketball.
A person with a thigh muscle strain often describes a popping or snapping sensation, along with sudden and severe pain. The area around the injury may be tender, bruised, and swollen.
Most muscle strains can be treated with the RICE protocol: Rest, Ice, Compression, and Elevation. It is important to follow your doctor's recommendations and allow the muscle to heal properly to prevent reinjury.
