case_images: PMC6029437_01
case_images: Case 1: radiograph demonstrates a type 2 coronoid fracture.
case_images: CRIOR2018-8512963.001.jpg
case_images: PMC6029437_01_CRIOR2018-8512963.001.jpg
case_images: fig1
case_images: Radiographs revealed a fracture of the ulna coronoid process, which was displaced by about 4 mm (Figure 1).
case_images: Case 1: arthroscopic photograph shows the fracture site (arrow). R: radial head; U: ulna (fracture bed); C: coronoid process.
case_images: CRIOR2018-8512963.002.jpg
case_images: PMC6029437_01_CRIOR2018-8512963.002.jpg
case_images: fig2
case_images: We confirmed the fracture site through the anterolateral portal (Figure 2).
case_images: Case 1: a guide pin is inserted from the posterior side.
case_images: CRIOR2018-8512963.003.jpg
case_images: PMC6029437_01_CRIOR2018-8512963.003.jpg
case_images: fig3
case_images: 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_images: Case 1: arthroscopic photograph shows a good reduction position after fixation by a CCS and K-wire.
case_images: CRIOR2018-8512963.004.jpg
case_images: PMC6029437_01_CRIOR2018-8512963.004.jpg
case_images: fig4
case_images: 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_images: Case 1: postoperative radiograph shows a good reduction position.
case_images: CRIOR2018-8512963.005.jpg
case_images: PMC6029437_01_CRIOR2018-8512963.005.jpg
case_images: fig5
case_images: We also confirmed a reduction by radiographs (Figure 5).
case_images: Case 1: radiograph 4 months after the operation shows bone union.
case_images: CRIOR2018-8512963.006.jpg
case_images: PMC6029437_01_CRIOR2018-8512963.006.jpg
case_images: fig6
case_images: After 3 weeks, the K-wires were removed, and bone union was achieved after 4 months (Figure 6).
case_images: PMC6029437_02
case_images: Case 2: postoperative radiograph shows fixation by two CCSs.
case_images: CRIOR2018-8512963.007.jpg
case_images: PMC6029437_02_CRIOR2018-8512963.007.jpg
case_images: fig7
case_images: 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).
case_images: PMC6029437_03
case_images: Case 3: radiograph demonstrates a type 2 coronoid fracture.
case_images: CRIOR2018-8512963.008.jpg
case_images: PMC6029437_03_CRIOR2018-8512963.008.jpg
case_images: fig8
case_images: He was also diagnosed with a coronoid process fracture, Regan-Morrey type 2 (Figure 8).
case_images: Case 3: postoperative radiograph shows fixation by three K-wires.
case_images: CRIOR2018-8512963.009.jpg
case_images: PMC6029437_03_CRIOR2018-8512963.009.jpg
case_images: fig9
case_images: However, the fracture was too comminuted to be fixed by CCS, so we performed osteosynthesis using three K-wires (Figure 9).
case_images: Case 3: radiograph 8 months after the operation shows bone union and removal of the K-wire.
case_images: CRIOR2018-8512963.010.jpg
case_images: PMC6029437_03_CRIOR2018-8512963.010.jpg
case_images: fig10
case_images: After 4 months, bone union was confirmed, and after 8 months, the K-wires were removed (Figure 10).