A sports injury may involve damage to one or a number of structures: muscles, ligaments, joints, tendons, and bones. The severity of the injury can often be assessed by the degree of pain, swelling and inability to use the damaged part of the body.
Muscle fibres may tear if the muscle is overstretched beyond its normal limits. This type of sports injury is known as a muscle strain. Muscles that are commonly affected include the hamstrings, quadriceps, groin, and calf muscles. Muscle fibres may also be damaged by direct blows which result in bruising.
A ligament is like a piece of cord which connects bones together and prevents excessive movement. A ligament sprain results when ligaments are stretched beyond their normal limits. Ankle and knee ligament sprains are the most common ones.
A joint injury results when one or more bones are partially or fully displaced. A joint subluxation occurs when the bones are partially displaced, and then return to their normal position. A joint dislocation results when the bones are fully displaced and remain out of position. Dislocations are often caused by falls or by collisions with other players. Shoulder dislocations are an example of this type of injury.
The most common of bone injuries are fractures. Fractures can result from a direct blow to the limb or any bone structure. Repetitive trauma that causes gradual bone breakdown is known as a stress fracture. Shin splints, for example, are caused by repetitive trauma.
You should see a qualified physician immediately for the proper diagnosis and treatment.