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The hamstring is a group of three muscles at the back of the thigh that are responsible for a range of movements, including walking, running, jumping, and climbing stairs. Hamstring injuries are common, especially in athletes who participate in sports that require sprinting, such as track, soccer, basketball, and waterskiing. These injuries can be caused by sudden movements like stopping, slowing down, or changing direction, which put a lot of strain on the muscles. The muscles that oppose the hamstring are the quadriceps, which work in conjunction with the hamstrings during the complex gait cycle of walking.
| Characteristics | Values |
|---|---|
| Muscle opposing the hamstring | Quadriceps |
| Hamstring muscles | Biceps femoris, semitendinosus, semimembranosus |
| Hamstring location | Back of the thigh, from the pelvis to the knee |
| Hamstring function | Extension of the hip joint, flexion of the knee joint, and rotation of the lower leg |
| Hamstring injuries | Pulled hamstring, partial tear, complete tear, muscle strains, flatback syndrome, spinal disc injury, sacroiliac (SI) joint dysfunction |
| Incidence of hamstring injuries | About 2 per 1000 hours of performance in sports and professional dancers |
| Risk factors | Adolescents, older athletes, excessive muscle strain, sudden movements, bone growth outpacing muscle growth |
| Prevention and treatment | Stretching, warming up, avoiding overloading the muscle, nonsurgical treatments |
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What You'll Learn
The quadriceps is the antagonist muscle of the hamstrings
The hamstring is any one of the three posterior thigh muscles in human anatomy between the hip and the knee. These muscles are the semimembranosus, semitendinosus, and biceps femoris. They are skeletal muscles that help us walk, climb stairs, run, and perform many other leg movements.
Hamstring muscles are very susceptible to injury, especially in athletes who run and sprint. A common hamstring injury is called a "pulled hamstring" or strain. This occurs when the muscle is stretched beyond its capacity or challenged with a sudden load.
The quadriceps are the antagonist muscle of the hamstrings. The hamstrings play an important part in the complex gait cycle during walking, which includes the absorption of kinetic energy and protection of the knee and hip joints. During the swing phase of walking, the hamstrings decelerate the forward motion of the tibia.
There is a complex interplay between hamstrings contraction and quadriceps contraction. During walking, the quadriceps are an antagonist to the hamstrings in the deceleration of knee extension. The quadriceps contract to extend the knee joint, while the hamstrings contract to flex the knee joint. This contraction and extension of the knee joint are essential for walking and running.
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The semitendinosus is a hamstring muscle
The semitendinosus shares its origin with the long head of the biceps femoris. Both muscles originate with a common tendon from a posteromedial impression on the superior part of the ischial tuberosity. The muscle fibres then descend in the posterior thigh and around the middle of the thigh, they give way to a cord-like tendon. The semitendinosus tendon takes an inferomedial course, passing posteriorly to the medial condyle of the femur and laterally to the medial condyle of the tibia.
The semitendinosus muscle is a prime mover, extending and internally rotating the thigh, flexing and internally rotating the leg. It also has a postural role, stabilising the pelvic girdle and the knee. Due to the location of their insertion points, all the hamstrings act as accessory medial stabilizers of the knee, complementing the function of the medial collateral ligament of the knee.
Injuries to the semitendinosus muscle can range from mild strains to more severe tears. They can occur as a result of sudden movements, overstretching, or overuse of the muscle. Sports activities, muscle imbalances, poor technique, and previous injuries can all contribute to the risk of injury. Treatment for a semitendinosus muscle injury typically involves basic soft tissue injury treatments to reduce swelling and pain, as well as over-the-counter pain or anti-inflammatory medications. In more severe cases, surgery may be necessary to repair a torn or ruptured semitendinosus muscle.
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The semimembranosus is a hamstring muscle
The semimembranosus is indeed a hamstring muscle. It is one of the three posterior thigh muscles that make up the hamstring, the others being the semitendinosus and the biceps femoris. The hamstring is located at the back of the thigh, starting at the pelvis and extending to the knee.
The semimembranosus is a relatively large muscle that originates from a small facet on the rough superolateral surface of the ischial tuberosity. The muscle begins as a flat and membranous structure that develops a fleshy belly about midway down the thigh. The tendon of the semimembranosus appears at the level of the mid-thigh and continues towards the point of insertion at the medial condyle of the tibia. The semimembranosus is on the innermost side of the back of the thigh, with the biceps femoris on the outside.
The hamstring muscles are skeletal muscles, meaning they are under voluntary control. They are involved in many daily activities such as walking, climbing stairs, running, jumping, and performing leg movements like squats. The semimembranosus specifically functions to flex the knee joint, extend the hip, and rotate the hip and lower leg.
The hamstring muscles are susceptible to injury, especially in athletes who run, sprint, ski, skate, or dance. A common hamstring injury is a "pulled hamstring" or strain, which can range from mild to severe. Hamstring injuries can be prevented by stretching, warming up, and avoiding pushing through pain in the hip, knee, and leg.
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The biceps femoris is a hamstring muscle
The biceps femoris has two heads, a long head and a short head. The long head is considered part of the hamstring muscle group, while the short head is sometimes excluded from this characterisation because it only causes knee flexion and not hip extension. The long head arises from the lower and inner impression on the posterior part of the tuberosity of the ischium, and the short head arises from the lateral lip of the linea aspera. The two muscle heads join together distally and unite in an intricate fashion.
The biceps femoris flexes the knee, extends the thigh at the hip, and rotates the lower leg from side to side when the knee is bent. It is the most commonly injured hamstring muscle, especially in sports that require explosive bending of the knee, such as sprinting.
The hamstring muscle group plays a prominent role in hip extension (posterior movement of the femur) and knee flexion (posterior movement of the tibia and fibula). They are important in many daily activities such as walking, running, jumping, and controlling some movement in the gluteus. They are also crucial in protecting the knee and hip joints.
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Hamstring injuries are common in athletes
Hamstring injuries are very common in athletes, especially those who participate in sports that require sprinting, such as track, soccer, basketball, and waterskiing. The hamstring muscles are the three posterior thigh muscles between the hip and knee: the semimembranosus, semitendinosus, and biceps femoris. These muscles are involved in knee flexion and hip extension, and they contract when the knee is bent and lengthen when the knee is extended.
Athletes who participate in high-speed activities are at a higher risk of hamstring injuries due to muscle fatigue. The hamstring may become fatigued faster than the quadriceps, leading to a strain. Additionally, suddenly increasing physical activity levels can cause hamstring injuries. This is because the hamstring muscles are very susceptible to injury when suddenly stopping, slowing down, or changing direction. Extending the leg when running can also overstretch these muscles.
A common hamstring injury is a pulled hamstring or strain, which can range from mild pulls to severe tears. The biceps femoris is the most commonly injured hamstring muscle, followed by semitendinosus. Tears from the pelvis (proximal tendon avulsions) are more common than tears from the shinbone (distal tendon avulsions). Surgery is typically only performed for tendon avulsion injuries, where the tendon has completely pulled away from the bone.
Most hamstring injuries respond well to simple, nonsurgical treatments, such as the RICE (Rest, Ice, Compression, Elevation) method. Early treatment with a plan that includes physical therapy can result in better function and a quicker return to sports. Rehabilitation typically takes about three months before returning to athletic activities.
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Frequently asked questions
The quadriceps major muscle group opposes the hamstring.
The hamstring is any one of the three posterior thigh muscles in human anatomy between the hip and the knee: the semimembranosus, semitendinosus, and biceps femoris.
The hamstring muscles help you extend your leg straight back and bend your knee. They also help with the internal rotation of the hip and joint.
Hamstring strains occur when the muscle fibres are overstretched or torn. They are graded (from Grade 1 to Grade 3) according to their severity.
Some examples of exercises that use the hamstring muscles are walking, running, jumping, and climbing stairs.
