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发表于 2009-8-20 21:01:40
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Chronic Mallet Finger (Secondary Repair)
As late as 12 weeks after injury, a mallet finger caused by avulsion of the extensor tendon from the distal phalanx can be satisfactorily treated by splinting, as described for an acute injury. After 12 weeks, if the distal phalanx droops severely but passive extension in the distal interphalangeal joint still is satisfactory, surgery may be indicated. TECHNIQUE 63-22
Make a V- or U-shaped incision, convex distally, with the tip 5 mm proximal to the nail base on the dorsum of the finger. Avoid injury to the germinal matrix of the nail. Develop the flap and elevate it proximally to expose the extensor tendon with its intervening scar. Attempt to identify the junction of the normal tendon with the scar and sever the tendon transversely proximal to the joint, leaving the insertion of the tendon into bone. Resect sufficient scar or tendon to allow closure of the gap with the finger in maximum extension. To support and protect the repair, immobilize the joint with a transarticular 0.045-inch Kirschner wire. Then repair the extensor tendon with 4-0 monofilament nylon or 4-0 monofilament wire as a pull-out roll stitch (see Fig. 63-21). No additional sutures are required. Close the skin with interrupted 5-0 nylon. Maintain the finger in extension and apply a compressive dressing. Support the finger with a volar splint for postoperative comfort and to avoid reinjury in the recovery period.
AFTERTREATMENT. The sutures are removed at 10 to 14 days, and the distal joint is maintained in extension, with the Kirschner wire protected by a small metal splint, for a total of 4 weeks. The Kirschner wire is removed after 4 weeks, and the repair is protected for a total of 8 weeks. Then normal activities are resumed progressively. |
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