After the initial pain and discomfort of a strain or sprain subsides, individuals usually resume or even increase their activity level. If an osteochondral lesion has occurred, however, everyday activities that put pressure on the joint, may lead to pain and swelling, although the joint usually is fine when at rest. A patient with an osteochondral lesion will often feel a dull ache in the joint and may also experience a mild locking or clicking of their knee or ankle joint. The affected joint may also seem to be loose.
Causes and Risk Factors
Usually, an osteochondral lesion occurs when there is an injury to the joint, especially if there is an ankle sprain or if the knee is badly twisted. Individuals who play sports such as soccer, football, rugby and golf may be at risk of an osteochondral lesion. Although the cause of such lesions is unknown, they may involve a genetic predisposition to such a condition. They also may be caused by abnormal bone development, especially when they occur in children. Repetitive trauma has also been associated with the development of such lesions.