What could be wrong if you bent your index finger back while playing tennis and now the knuckle is swollen throbbing?

Possible injuries:

* Sprained ligament. A sprained ligament occurs when a ligament, which is a tough band of tissue that connects bones, is stretched or torn. This can happen if you bend your finger back too far, causing the ligament to overstretch or tear.

* Fractured bone. A fractured bone occurs when a bone breaks. This can happen if you bend your finger back with enough force, causing the bone to crack or break.

* Tendonitis. Tendonitis is an inflammation of the tendon, which is a thick cord of tissue that connects muscle to bone. This can happen if you overuse your finger, such as by repeatedly bending it back while playing tennis.

Symptoms:

* Swelling

* Throbbing pain

* Bruising

* Difficulty moving your finger

Treatment:

The treatment for a sprained ligament, fractured bone, or tendonitis will depend on the severity of the injury. Treatment options may include:

* Rest

* Ice

* Compression

* Elevation

* Over-the-counter pain relievers

* Physical therapy

If you have bent your index finger back while playing tennis and are experiencing swelling and throbbing pain, it is important to see a doctor to get a diagnosis and treatment plan.