
The hamstrings are skeletal muscles located at the back of the thigh, which are used for walking, climbing stairs, jumping, and many other leg movements. They are made up of three muscles: the biceps femoris, semitendinosus, and semimembranosus. Hamstring muscles are susceptible to injuries, especially in athletes who run and sprint. A hamstring strain or pull is a tear of muscle fibres, which can range from mild to severe. In severe cases, the hamstring muscle tears away from the tendon or bone, requiring surgery.
| Characteristics | Values |
|---|---|
| Hamstring muscles | Skeletal muscles |
| Location | Back of the thigh |
| Function | Walking, climbing stairs, doing squats and performing other leg movements |
| Susceptibility to injury | Very susceptible to injury, especially in athletes that run and sprint |
| Injury treatment | Non-surgical treatments, surgery is rare |
| Injury prevention | Stretching, warming up and not pushing through pain in your hip, knee and leg |
| Structure | Contain thousands of tiny, elastic muscle fibers |
| Muscle fibers | Red and white |
| Grades of strain | Grade 1: Muscle fibers overstretch but don't tear; Grade 2: Partial tear; Grade 3: Complete tear from tendon or bone |
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What You'll Learn

Hamstrings are skeletal muscles
The hamstrings play a critical role in human activities, ranging from standing to more explosive actions such as sprinting and jumping. They are involved in the complex gait cycle during walking, which includes absorbing kinetic energy and protecting the knee and hip joints. The hamstrings decelerate the forward motion of the tibia during the swing phase of walking. There is a complex interplay between the hamstrings and quadriceps, which are antagonist muscles.
The semitendinosus, a long hamstring muscle in the middle of the back of the thigh, is responsible for extending and rotating the hip, as well as bending and internally rotating at the knee. It is attached to the medial (inner) side of the sit bones and runs down the middle of the back of the thigh, crossing to the inside of the knee and attaching to the upper part of the tibia (shinbone). The semimembranosus, on the other hand, is a broad muscle that is a bit tucked away. It originates at the outer side of the sit bones, higher than the other hamstrings, and attaches to the back and side of the medial (inner) tibial condyle.
Hamstring muscles are very susceptible to injury, especially in athletes who run and sprint. The most common type of hamstring injury is a strain, which occurs when the muscle fibres are overstretched or torn. Strains can range from mild to severe, depending on the extent of the tear and the resulting symptoms. Severe hamstring injuries can also involve tendon avulsions, where the tendon pulls away from the bone, sometimes even taking a small piece of bone with it. These injuries often require surgery and a prolonged recovery period.
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They are located at the back of the thigh
The hamstring muscle group is located at the back of the thigh. It is comprised of three individual muscles: the biceps femoris, semitendinosus, and semimembranosus. These muscles are used for various activities, including standing, walking, running, jumping, and climbing stairs. They are also essential for more complex movements, such as squats.
The hamstrings play a critical role in human activities, and their health is of utmost importance to athletes, especially runners and sprinters. Hamstring injuries are very common, and they often occur when the muscle is stretched beyond its capacity or suddenly loaded. This can lead to muscle strains, which can range from mild to severe, depending on the extent of the tear in the muscle fibers.
To avoid hamstring injuries, it is important to properly stretch and warm up before any physical activity. Additionally, one should be mindful of not pushing through pain in the hip, knee, or leg, as this could be a sign of a more severe injury. A severe hamstring injury may require surgery, especially if the tendon has been torn from the bone.
The semitendinosus, located in the middle of the back of the thigh, is responsible for extending and rotating the hip, as well as bending and internally rotating the knee. It originates from the medial side of the sit bones and attaches to the upper part of the tibia (shinbone). On the other hand, the semimembranosus is a broad muscle that originates from the outer side of the sit bones and attaches to the inner side of the shin.
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They are susceptible to injuries
Hamstring muscles are very susceptible to injuries, especially among athletes who run and sprint. The sudden act of stopping, slowing down, or changing direction puts a lot of strain on these muscles. Extending your leg when running can also overstretch these muscles, resulting in a "pulled hamstring".
Athletes who participate in sports like football, soccer, basketball, skiing, skating, dancing, and other activities that require a lot of quick stops and starts are more prone to hamstring injuries. In fact, hamstring injuries are the most common sports injury, accounting for about 37% of all soccer injuries.
The hamstring muscles are located at the back of the thigh and are responsible for helping you walk, run, bend your knees, and extend your legs. They are also involved in other leg movements such as climbing stairs and doing squats. The three hamstring muscles are the biceps femoris, semimembranosus, and semitendinosus. The biceps femoris is closest to the outside of your body and is responsible for flexing your knee, extending your thigh at the hip, and rotating your lower leg from side to side when your knee is bent. The semimembranosus is located closer to the middle of your body and also helps with flexing your knee joint, extending your thigh at the hip, and providing medial rotation for your hip and lower leg.
Hamstring injuries can occur in different severities, ranging from mild muscle pulls or strains (grade 1) to partial tears (grade 2) and complete tears (grade 3). Grade 1 injuries typically cause sudden pain and tenderness at the back of the thigh, while grade 2 injuries result in more severe pain, tenderness, swelling, and bruising. In grade 3 injuries, the muscle tissue completely tears away from the tendon or bone, often causing severe swelling and pain and making it difficult to use the affected leg.
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Hamstring strains are common sports injuries
Hamstring strains are indeed common sports injuries. The hamstring muscles are skeletal muscles located at the back of the thigh. They are used for walking, climbing stairs, doing squats, and performing other leg movements. The hamstring muscles contain thousands of tiny, elastic muscle fibres that help them contract or tighten.
Hamstring strains can be caused by several factors, including sudden movements like stopping, slowing down, or changing direction while running. They can also occur when the leg is extended while running, which can lead to overstretching of the hamstring muscles. Additionally, muscle overload can cause hamstring strains when the muscle is stretched beyond its capacity or challenged with a sudden load. This can happen during sprinting when the hamstring muscles contract eccentrically as the back leg is straightened for forward motion.
Athletes who participate in sports that require sprinting or kicking, such as track, soccer, basketball, Australian football, rugby, and American football, are particularly susceptible to hamstring strains. Acute hamstring strains are the most common type of muscle strain in these sports and can lead to prolonged absence from sports. They can range in severity from mild overstretching of muscle fibres to complete tears of the muscle tissue from the tendon or bone.
To prevent hamstring strains, athletes should focus on stretching, warming up, and listening to their bodies to avoid pushing through pain in the hip, knee, and leg. Conservative management of hamstring strains involves a progressive rehabilitation protocol that gradually increases intensity and range of motion. Surgery is typically only required for tendon avulsion injuries, where the tendon has pulled away from the bone.
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Treatment ranges from non-surgical to surgery
Hamstring injuries are common in athletes and can range from mild to severe. Most hamstring injuries respond well to non-surgical treatments, but some severe injuries may require surgery.
Non-Surgical Treatments
Partial hamstring tears typically heal with over-the-counter anti-inflammatory pain medication, such as ibuprofen, and RICE (rest, ice, compression, and elevation). Crutches or a cane may be used to keep weight off the injured leg. For partial tears, conservative methods of treatment, including rest and splinting, are often effective. As scar tissue forms during the healing process, it creates a bridge that reconnects the muscle to the bone.
Surgical Treatments
Surgery is required for complete hamstring tears (grade 3) where the tendon has pulled away completely from the bone. This type of injury will not heal on its own. During surgery, the surgeon will pull the hamstring tendon back into place, remove any scar tissue, and reattach the tendon to the bone using small anchors. After surgery, the patient will need to keep weight off their leg and may require crutches or a brace to protect the repair. Physical therapy will begin with gentle stretches to improve flexibility and range of motion, gradually progressing to strengthening exercises. The recovery process for athletes can take up to six months, including a "return to sport" protocol to prepare them for training and competition.
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Frequently asked questions
Hamstrings are skeletal muscles at the back of your thigh. They are made up of three individual muscles: the biceps femoris, semitendinosus, and semimembranosus.
Hamstrings are essential for standing, walking, running, jumping, and climbing stairs. They are also used in many other leg movements.
Hamstring injuries are the most common sports injury, especially in athletes who participate in sports that require sprinting, such as track, soccer, and basketball. They are caused by muscle overload, which occurs when the muscle is stretched beyond its capacity or challenged with a sudden load.

















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