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Ankle Cartilage Injury

Osteochondral injuries are one of the most common causes of ankle pain. Though in a majority of cases there is a history of injury or trauma to the ankle joint, a few cases may not have any previous history of ankle injury. A condition known as osteochondritis dissecans is commonly seen in the knee and ankle joint and is characterized by the damage and separation of a piece of bone and cartilage, within the joint, from the underlying bone. In the ankle joint it mainly affects the talus bone and sometime the lower end of the tibia or shin bone may also be affected.

Causes

The natural causes of osteochondral injuries are still not clear; however injury to the talus bone, any local osteonecrosis or lack of blood supply to the bone or any metabolic defect may affect the bone and result in osteochondral injury. Sometimes an unresolved ankle sprain may also result in osteochondral injury.

Symptoms

The predominant symptom of osteochondral injury is pain, which may be localized to the ankle joint. Other symptoms include tenderness and swelling of the ankle joint with difficulty in weight bearing. Some patients complain of locking of the ankle. In most of the patients it may also be associated with ligament injuries.

Diagnosis

Osteochondral injuries can be diagnosed by physical examination, X-ray and other advanced imaging techniques such as CT and MRI scan. Plain X-ray images will also demonstrate other fractures, bone spurs and narrowing of the joint. A CT scan helps identify any bony fragments and cysts, but is not very helpful to visualize bone edema or cartilage defects. MRI is the best imaging modality which helps to visualize the cartilage and the bone lesions as well as bone edema.

Treatment

Both non-surgical and surgical treatment can be used for the management of osteochondral injuries of the ankle joint. The non-surgical treatment may be used for surface injuries and for rehabilitation purposes to improve muscle strength, mobility and coordination and protect the injured part by a brace or cast. Surgical treatment is recommended for more severe injuries and comprises of debridement of the flaps of the cartilage and removal of any loose bodies. Some of the most commonly used surgical techniques include arthroscopy, synovectomy or screw fixation.

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