PMC6875408_01
Lateral radiograph at the injury site.
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fig1
The images of plain radiography and computed tomography showed an avulsion fracture of one-third to half of its articular surface at the base of the distal phalanx (Figure 1).
The radiograph images after reduction and fixation.
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fig2
Using the hook plate technique, open reduction was performed under general anesthesia 19 days after the injury (Figure 2).
The 1.5 mm mini plate before (a) and after the plate was modified by cutting the hole and bending the ends of crescent arc (b).
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fig3
The fracture was reduced and fixed using a hook plate adapted from a 1.5 mm micro module (KLS Martin, Germany, Figure 3(a)). The ends of the crescent arc were bent approximately 100  by pliers to form two sharp pointed hooks (Figure 3(b)).
Follow-up radiographs showing the healed fracture.
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fig4
Bone union was achieved and the plate was removed 3 months after the procedure (Figure 4).
Active range of motion of the IP joint of 8  of extension (a) and 90  of flexion (b).
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fig5
The range of motion on the contralateral side was 85 degrees of flexion and 10 degrees of extension (Figures 5(a) and 5(b)).
Transverse line deformity of the nail that gradually disappeared.
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fig6
The patient had a transverse line nail deformity (Figure 6) that gradually improved.