The kneecap (patella) moves smoothly within its groove on the femur when bending or straightening the knee. However, after a hard blow or fall, it can dislocate partially or fully, causing pain and loss of knee function. Even if the kneecap returns to position naturally, a doctor’s evaluation is necessary to check for soft tissue or joint damage and provide appropriate treatment.
There are various reasons why a child’s kneecap might become unstable or dislocate. Sometimes, even minimal force can cause this due to abnormalities in the knee’s structure. For instance, a shallow or uneven groove in the femur may not securely hold the patella in place. Children with loose ligaments or extremely flexible joints are more prone to dislocations, a condition often seen in girls and sometimes affecting both knees.
In children with healthy knee structures, patellar dislocations frequently result from direct trauma or falls, particularly during high-impact sports like football. Non-contact injuries can also cause dislocations, such as during a baseball swing, where rotational forces on the leg can cause the patella to dislocate.
When the patella dislocates, symptoms vary depending on the severity. Common signs include pain, a sensation of the kneecap shifting, knee buckling, a popping sound during dislocation, swelling, visible deformity, and apprehension when moving or changing direction.
For nonsurgical treatment of patellar dislocation, your child’s doctor will likely recommend wearing a knee brace for 3-4 weeks to keep the knee stable while it heals. If your child’s patella dislocates multiple times or remains unstable despite bracing and therapy, surgery may be necessary. The exact type of surgery will depend on whether the problem stems from ligament issues, structural abnormalities, or bone deformities. One common approach is ligament reconstruction, where damaged or weak ligaments are repaired to better hold the patella in place. This procedure can often be performed arthroscopically, meaning that the surgeon uses a small camera and precise instruments through tiny incisions, minimizing recovery time and scarring. However, if the cause of the instability is a congenital defect or significant bone deformity, more complex surgery may be required to address the issue properly.