Dislocation of the upper tibiofibular joint is rare and has not been reported in the national literature.Owen (1963) and Wilson (1976) discussed habitual dislocation of the upper tibiofibular joint, which has attracted clinical attention. The morphology of the superior tibiofibular joint surfaces is of two types: horizontal and oblique. In the horizontal type of joint, the surface of the upper fibula is flattened and rounded with mild depression, while the corresponding joint of the tibia is also flattened and rounded and mildly convex. This surface is below the upper tibial epiphysis and prevents dislocation of the fibula by anterior impingement. The oblique joint varies according to its position, shape, and inclination, ranging from 14 to 37 degrees, with an average of about 20 degrees, but with a maximum inclination of 76 degrees. Most of the oblique type joint surfaces are small and easily dislocated. It is believed that the majority of tibiofibular supra-articular dislocations are of the oblique type. Clinical typing was proposed by Lyle, who classified the direction of subluxation displacement in the transverse section of the bone in this disease into four categories: forward, backward, upward and bi-directional, indicating the direction and position of the displacement of the fibular tuberosity. Bidirectional displacements indicate that the fibular tuberosity may be combined with subtalar joint dislocation along with forward or upward displacement of the fibular tuberosity. In contrast, Ogden used subluxation, anterior external dislocation, posterior internal dislocation, and posterior superior dislocation. A subluxation is defined as an anterior-posterior laxity of the fibular tuberosity only, which does not have the typical dislocation features in the x-ray image, but is accompanied by pain in the lower limb and lateral knee, pain and muscular atrophy phenomenon in the compressed fibular tuberosity, causing the fibular tuberosity to slide and be painful when the calf is externally rotated. There are 43 cases of tibiofibular supra-articular dislocation reported in the comprehensive literature, including 10 cases of subluxation, 29 cases of anterolateral dislocation, 3 cases of posterior medial dislocation, and 1 case of upward dislocation. 67.4% (29 cases) were aged 13-27 years, with the youngest being 8 years old. Maximum 67 years old, most of them had history of trauma, and 3 cases had a feeling of instability in the small head of the fibula in the past. (A) Traumatic upper tibiofibular joint dislocation is caused by acute trauma, from the back or from the front of the direct violence strikes in the fibular tuberosity head caused. If direct violence strikes any part of the fibular body, it can lead to a fracture of the fibular stem, which hardly leads to dislocation of the upper tibiofibular joint. Because the upper tibiofibular joint has very little mobility, and when the foot is immobilized to rotate the calf, it moves only 1 to 3 mm. Because of its surrounding deep fibular head ligament, and the tibia several ring-like closely connected, lateral to the femoral ankle of the knee lateral collateral ligament, knee peripheral fascia in the outer layer of the envelope, the iliotibial bundle of the outward fibers and the deep fascia covering the fibular head, superficial more powerful biceps tendon is covered by the adhesion; and because of the anterior medial side of the tibia is large, the fibula of the short fibula is attached to the side of the tibia. Rarely will lead to dislocation of the upper tibiofibular joint. Therefore, the upper tibiofibular joint is rarely dislocated. However, when the small head of the fibula is impacted by direct violence in the sagittal plane, dislocation of the small head of the fibula is still possible. The affected knee is swollen and painful on the lateral side, with a mass protruding from the anterior aspect of the upper tibia, palpated as a bony prominence, and perceived as a fibular tuberosity and floating sensation on compression, with a mobility of about 1 cm. It is generally impossible to press it into place without popping it up. Mostly due to peroneal nerve injury caused by tibialis anterior muscle group and peroneal muscle group paralysis appeared horseshoe foot and pain and medical treatment, the lateral lower leg and the dorsum of the foot, plantar areas of skin sensory deficits. The affected limb can generally hold weight, but due to paralysis of the extensor digitorum longus muscle, the gait can be a cross-threshold gait: a flexed hip and knee gait with excessive elevation of the lower limb. Dislocation and pain are induced when the patient stands on the foot in the flexed knee position and rotates the trunk without movement. (ii) Habitual dislocation of the upper tibiofibular joint is rare and occurs in adolescent females, mostly before the age of 18. There may be a vague history of trauma, but symptoms tend to occur without obvious triggers unless localized symptoms are evident and noted. Often the diagnosis is misdiagnosed as a meniscal disorder and unnecessary surgical exploration is performed. Patients with anterior displacement of the head of the fibula, resulting in the anterolateral protrusion of the knee, touching the floating sensation, accompanied by pain, the affected limb walking due to pulling the fibula and local friction caused by pain. This disease does not need treatment, or can advise the patient in sports with support bandage wrapped around the affected knee, local instability phenomenon to adults will disappear. In adults, if there is still dislocation with pain, the upper part of the fibula can be removed, which is also an important measure to prevent superficial peroneal nerve injury neuritis.