A knee sprain is a stretched or torn ligament in your child's knee. Ligaments support the knee and keep the joint and bones in the correct position. A knee sprain may involve one or more ligaments.
Psoriatic arthritis (PsA) is a chronic condition that occurs in people with psoriasis. Psoriasis is an inflammatory disease that affects the skin and nails and can also affect the joints. Finger PsA may cause pain and swelling in one or more finger joints.
The lateral collateral ligament (LCL) is a thin band of connective tissue that runs along the outside of the knee. It connects the femur to the fibula and stabilizes the knee, bracing it from unusual impact. However, injuries are common, particularly during contact sports.