Proximal Tibiofibular Joint Dislocation

Description

Proximal tibiofibular joint dislocation is an uncommon injury to a joint at the outer knee, where adjoining bones are displaced from their normal position, and the joint surfaces no longer touch each other. The joint is actually outside the knee and involves the two bones of the lower leg, the tibia and the fibula. These bones also make up the upper part of the ankle joint. Subluxation of this joint, when the joint surfaces still touch but are not in normal relationship to each other, is also uncommon; however, subluxation may occur with a fracture of one or both of the leg bones.

Common signs and symptoms

• Pain in the outer knee and occasionally in the ankle

• Pain that may just be an ache or that may be severe with standing on or moving the affected leg or knee

• Giving way or buckling of the knee

• Locking or catching of the knee

• Often an obvious bump on the outer side of the knee, with tenderness and mild swelling over the outer knee and bruising at the injury site

• Occasionally, increased pain at the knee with up-and-down ankle motion

• Numbness or paralysis below the dislocation from stretching injury to the nerves (uncommon)

Causes

Many causes may lead to this uncommon injury. These include a direct blow to a bent knee, twisting injury, ankle fracture–dislocation, infection, growth disturbance, and other non–sports-related causes, including congenital problems (birth defects). One of the most common causes is falling in a hurdler’s position, with one leg bent, but it may also occur without injury in people with loose joints.

Factors that increase risk

• Sports in which an athlete may fall in a hurdler’s position, with one leg bent, as with sliding in baseball and in sliding tackles in football; also, wrestling, football, jet ski racing, skiing, gymnastics, broad jumping, basketball, parachute jumping, horseback riding, rugby, and judo

• Congenitally loose ligaments (“double jointed”)

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