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Myotendinous Junction

The myotendinous junction is the interface between muscle and tendon, and it allows the force generated by muscle contraction to be exerted on the skeleton to enact limb locomotion. To maximize the junctional surface area, a region of highly folded membranes in a fingerlike arrangement exists.

This increases the surface area between the muscle and […]

Apophysitis

In a muscle and tendon unit there are certain areas at high risk of injury: these are the attachments of muscle and tendon to bone, the muscle and tendon tissue itself, and also the point at which muscle and tendon merge (the muscle-tendon junction). In adults, the muscle or tendon tissue itself is often injured […]

Knee extension mechanism injuries

The knee extension mechanism includes the quadriceps muscle-tendon, the patellar bone, the patellar tendon, and its insertion into the tibia. Injuries can occur in all these structures.

Quadriceps tendon injuries The distal quadriceps tendon attaches to the patella and its adjacent soft tissue structures (the retinaculum). It is important for the extensor mechanism. This tendon […]

Other causes of Pain in the Hip and Groin

Overuse injury or rupture of other groin muscle-tendon units

A number of muscles and tendons affecting the groin region, including the pectineus, the sartorius, the tensor fasciae latae, and the gluteus medius, can be damaged during sporting activity. The precise location of the pain, together with an assessment of muscle function, can elucidate the diagnosis.

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Rupture of the Upper part of the Rectus Femoris Muscle-Tendon Unit

Pain in the groin can be caused by a rupture in the origin or the upper third of the rectus femoris muscletendon junction. This rupture is usually partial, but complete rupture may occur. The rupture can occur during shooting and tackling in football and also during fast acceleration in general.

Symptoms and diagnosis

– During […]

Overuse Injury of the upper part of the Rectus Femoris Muscle-Tendon Unit

The rectus femoris muscle arises above the articular cavity of the hip joint. The muscle flexes the hip and extends the knee joint. After intensive shooting practice in soccer, repeated fast starts, strength training, and similar activities, pain can be felt just above the hip joint.

Symptoms and diagnosis

– Pain occurs during and after […]

Rupture of the Adductor Muscles

Ruptures of the adductor longus can be partial or complete. Complete ruptures are usually located at the muscle’s insertion into the femur, but can also occur at its origin in the pubic bone. Partial ruptures usually occur in the muscle-tendon junction. A rupture of the adductor longus muscle can occur when the muscles of the […]

Groin Injuries

Overuse of the adductor muscle-tendon unit

The muscles that draw the leg inwards (adduct at the hip joint) are primarily the adductor longus, the adductor magnus, the adductor brevis, and the pectineus muscles. The gracilis muscle and the lower fibers of the gluteus maximus also work as adductors. However, it is usually the adductor […]

Muscle Ruptures

Muscle fibers respond and adapt quickly to change. Damaged muscle can heal quickly with fibers regenerated in about 3 weeks. When injury occurs, however, there is almost inevitably some degree of bleeding, and this can affect the healing process mechanically by reducing contact between the ruptured ends of the muscle fibers. If bleeding can be […]

Types of Injury to the Muscle-tendon Complex

Muscles and tendons function together as units. In principle, injuries can affect the muscle origin, the muscle belly, the point at which muscle and tendon merge (the muscle-tendon junction), the tendon itself,and the insertion of the tendon into bone and periosteum. In practice, injuries to the muscles usually occur at the muscle-tendon junction regardless of […]