PMC9730028_01
Preoperative imaging showing posterolateral dislocation of the left elbow. (A,B) Radiographs show anteriorly inferior slippage of the distal humerus without fracture; (C,D) Three-dimensional computed tomography shows a transverse defect of the coronoid process of the ulna, (E,F) The MRI of left elbow shows no injury of medial collateral ligament and lateral collateral ligament. (G,H) The MRI of left elbow shows posterolateral dislocation.
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F1
The magnetic resonance imaging (MRI) of the left elbow showed posterolateral dislocation of the left elbow and there was no injury in medial collateral ligament and lateral collateral ligament, as shown in Figure 1.
Parameters of the coronoid process of the ulna and the tip of the olecranon. (A) represents the height of the coronoid process of the ipsilateral ulna preoperatively; (B) represents the height of the coronoid process of the ipsilateral ulna postoperatively; (C) represents the height of the unaffected coronoid process; (D) shows that the osteotomy angle of the olecranon is about 52.1 . (a/c = 0.875, b/c = 1.2). F is a flat spot in the proximal ulna. The three dashed lines represent the highest point of the coronoid process of the ulna, the lowest point of the sigmoid notch, and the level of the flat spot (green lines). The 0  angle runs parallel to the flat spot of the corresponding olecranon, and is defined by the constructed coordinate system (blue lines).
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F2
Measurements showed a preoperative height defect of 12.5% of the coronoid process, and the height of the reconstructed coronoid was 1.2 times that of the unimpaired side (Figures 2A-C). We also measured the angle of the olecranon tip, which was 52.1  (Figures 2D).
Postoperative imaging showed Normal recovery of the left elbow dislocation. (A,B) Radiographs show that the internal fixation device is in good position; (C,D) Three-dimensional computed tomography showed no arthritic or graft absorption of the elbow.
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F3
At the 10th month follow-up, radiography and three-dimensional CT results of the left elbow showed that the internal fixation device was in a good position without complications, such as displacement and fracture, and there were no manifestations of osteoarthritis changes or graft absorption, as shown in Figure 3.
After 22 months of follow-up, the functional range of motion of the patient's upper limbs was symmetrical. (A) External rotation; (B) Internal rotation; (C) Extension (front view); (D) Extension (side view); (E) Flexion (side view).
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F4
After 22 months of follow-up, the patient had a symmetrical range of motion in both elbow joints with no residual dysfunction, as shown in Figure 4.