[Wedge excision: a new reconstructive technique after longitudinal nail biopsy].

A biopsy is needed when a solitary melanonychia striata in a white patient remains unexplained after careful clinical examination in order to rule out the development of a malignant melanoma. The ideal biopsy has to excise entirely the lesion and to provide enough tissue for pathological examination. The authors describe a new method of excisional biopsy based on primarily closure using a longitudinal closing wedge osteotomy of the distal phalanx. The longitudinal elliptical resection extended from the distal interphalangeal joint to the hyponychium with en bloc resection of the entire thickness of the nail complex, including the periosteum. A longitudinal closing wedge osteotomy was then performed in the distal phalanx allowing primarily closure with precise alignment of the nailbed edges. After suture of the nailbed, a tension band nail synthesis was performed. Four consecutive melanonychia striata of 2 to 3 mm were consecutively operated on using this technique. Postoperative cares were uneventful in all the cases. The pathological examination confirmed the diagnosis of melanoma in one case, Bowen's disease in one and junctional nevus in two. Cosmetic and functional assessment at a mean follow-up of 12 months evidenced light nail dystrophy in all the cases. Our method offers to the pathologist enough tissue with preserved architecture for precise pathological examination. The technically simple closing wedge osteotomy never complicated the postoperative course. These preliminary results are encouraging and allow us to recommend this technique for the diagnosis of all suspect melanonychia striata between 2 and 3 mm wide.