PMC5932511_01
PMC5932511_02
Preoperative photographs of the affected hand in Case 1. (a) Making a fist was difficult due to finger overlapping. (b) Passive finger flexion under general anesthesia revealed marked rotation of the little finger.
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fig2
The patient could not make a fist because of the overlapping of the little finger over the ring finger (Figure 2).
Preoperative imaging in Case 1. (a) Plain radiographic anteroposterior view of the right little finger. The distal articular surface of the proximal phalanx of the little finger was tilted in the ulnar direction. (b) Plain radiographic lateral view of the right little finger. (c) Three-dimensional computed tomography of the proximal phalanx of the right little finger.
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fig3
Plain radiography showed that the angle between the proximal growth plate and the distal articular surface of the proximal phalanx was 29  on the affected side compared with 5.5  on the contralateral noninjured side (Figure 3).
Photographs of Case 1 taken 1 year postoperatively. (a) Dorsal view. (b) Palmar view of the clenched fist. The alignment of the little finger was good. Because of the retained extension contracture of the metacarpophalangeal joint, the tip of the little finger could not touch the palm. (c) Lateral view.
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fig4
At postoperative 1 year, the valgus deformity and overlapping of the little finger had completely resolved (Figure 4).
Postoperative radiographs of Case 1. (a, b) Images taken immediately after the surgery. (c, d) Images taken 1 year postoperatively.
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fig5
The angle between the growth plate and the distal articular surface of the proximal phalanx was 4.5  (Figure 5).
PMC5932511_03
PMC5932511_04
Preoperative photographs of Case 2. (a) There was a gap between the left ring and little fingers in the fully extended and adducted position. (b) The left little finger was partially covered by the ring finger in the fully flexed position.
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fig6
At 2 years after the injury, the patient consulted our clinic due to a gap between the ring and little fingers in the fully extended and adducted position (Figure 6).
Radiographs of Case 2. (a, b) Preoperative radiography of the left little finger. (c, d) Images taken immediately after the surgery. (e, f) Images taken 3 months postoperatively.
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fig7
Plain radiography showed that the angle between the proximal growth plate and the distal articular surface of the proximal phalanx was 15.3  on the affected side compared with 4.7  on the contralateral noninjured side (Figure 7).
Photographs of Case 2 taken 1 year and 2 months postoperatively. The valgus deformity and overlapping of the left little finger had completely resolved.
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fig8
At 1 year and 2 months postoperatively, the valgus deformity and overlapping of the little finger had completely resolved (Figure 8).