Objective To investigate the feasibility of simple wire compression fixation in the treatment of osseous mallet finger. Methods Four adult cadavers hand specimens, with a total of 16 fingers including index finger, middle finger, ring finger and little finger, were collected to measure and study the width of the extensor tendon insertion, the distance from the extensor tendon insertion to the nail matrix, the total length of the distal phalanx, and the nail matrix length. A total of 12 finger specimens (three fingers each in index finger, middle finger, ring finger and little finger) were selected for imitated operation. The model of bony mallet finger was artificially designed. The wire was traversed and bent from the junction of the tendon and the bone fragment, and the wire exit point on the distal phalanx was found. Three horizontal holes were drilled with Kirschner wires along the piercing point and the sides of the distal and proximal ends. After the wire was pierced, it was tightened with the other end and buried under the skin. The position changes of cross pressure points above the bone block were observed. Results The final phalanx exit point moved in the same direction as the wire crossing point. The avulsion bone was unstable after the penetration point moved to both ends. When the penetration point was the proximal 1/3 of the end phalanx, the wire was crossed over the bone block without loosening the avulsion bone block. Conclusions The most suitable point of bone penetration is the intersection of the extension line and the phalangette. It is feasible to treat mallet fingers by wire compression fixation.
Key words
Bone fracture induced mallet fingers /
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Tendon injuries /
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Surgical treatment /
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Insertion of extensor tendon /
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Anatomical measurement
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