PMC6029437_01
Case 1: radiograph demonstrates a type 2 coronoid fracture.
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Radiographs revealed a fracture of the ulna coronoid process, which was displaced by about 4 mm (Figure 1).
Case 1: arthroscopic photograph shows the fracture site (arrow). R: radial head; U: ulna (fracture bed); C: coronoid process.
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We confirmed the fracture site through the anterolateral portal (Figure 2).
Case 1: a guide pin is inserted from the posterior side.
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Under fluoroscopic control, a guide pin for a cannulated cancellous screw (CCS) was inserted from the posterior ulnar shaft into the coronoid fragment (Figure 3).
Case 1: arthroscopic photograph shows a good reduction position after fixation by a CCS and K-wire.
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We fixed the fracture with a 3.5 mm CCS and two 1.5 mm K-wires, whilst confirming the anatomical reduction arthroscopically (Figure 4).
Case 1: postoperative radiograph shows a good reduction position.
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We also confirmed a reduction by radiographs (Figure 5).
Case 1: radiograph 4 months after the operation shows bone union.
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After 3 weeks, the K-wires were removed, and bone union was achieved after 4 months (Figure 6).
PMC6029437_02
Case 2: postoperative radiograph shows fixation by two CCSs.
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We performed arthroscopic osteosynthesis 5 days after the injury in almost the same way as described in Case 1, using two 3.5 mm CCSs (Figure 7).
PMC6029437_03
Case 3: radiograph demonstrates a type 2 coronoid fracture.
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He was also diagnosed with a coronoid process fracture, Regan-Morrey type 2 (Figure 8).
Case 3: postoperative radiograph shows fixation by three K-wires.
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However, the fracture was too comminuted to be fixed by CCS, so we performed osteosynthesis using three K-wires (Figure 9).
Case 3: radiograph 8 months after the operation shows bone union and removal of the K-wire.
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After 4 months, bone union was confirmed, and after 8 months, the K-wires were removed (Figure 10).