{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,31]],"date-time":"2026-08-31T06:14:14Z","timestamp":1788156854157,"version":"build-2803163510"},"reference-count":17,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T00:00:00Z","timestamp":1787011200000},"content-version":"vor","delay-in-days":17,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,8,1]],"date-time":"2026-08-01T00:00:00Z","timestamp":1785542400000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Clinical Case Reports"],"published-print":{"date-parts":[[2026,8]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Isolated injury to the deep motor branch of the ulnar nerve at Guyon's canal is an uncommon condition, particularly following penetrating trauma, and may be overlooked because sensory function is often preserved. We report the case of a 39\u2010year\u2010old right\u2010handed male dental assistant who presented with progressive weakness of the left hand 3\u2009months after sustaining a puncture injury from a sharp dental instrument. Clinical examination demonstrated weakness and wasting of the intrinsic hand muscles with intact sensation. Nerve conduction studies and electromyography localized the lesion to the deep motor branch of the ulnar nerve. Surgical exploration identified a neuroma within Guyon's canal, which was excised, followed by tension\u2010free epineural repair under microscopy. The patient was managed with postoperative splinting and hand therapy and showed gradual functional recovery. Electromyography demonstrated evidence of reinnervation at 6\u2009months, and first dorsal interosseous muscle strength improved from M0 preoperatively to M4 at the 18\u2010month follow\u2010up, with resolution of Froment's and Wartenberg's signs and restoration of intrinsic hand function. This case emphasizes that isolated motor branch injury should be considered in patients with persistent intrinsic hand weakness after penetrating trauma around Guyon's canal, even in the absence of sensory deficits. Careful clinical assessment, appropriate electrodiagnostic evaluation, and surgical exploration can result in favorable functional recovery.<\/jats:p>","DOI":"10.1002\/ccr3.73373","type":"journal-article","created":{"date-parts":[[2026,8,19]],"date-time":"2026-08-19T04:40:51Z","timestamp":1787114451000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Isolated Injury to the Motor Branch of Ulnar Nerve Following Penetrating Trauma: A Case Report"],"prefix":"10.1002","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1038-0778","authenticated-orcid":false,"given":"Hossein Ali","family":"Abdolrazaghi","sequence":"first","affiliation":[{"name":"Department of Hand Surgery Tehran University of Medical Sciences  Tehran Iran"},{"name":"Department of Plastic Surgery Shahid Beheshti University of Medical Sciences  Tehran Iran"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4338-2726","authenticated-orcid":false,"given":"Sajede","family":"Karimi","sequence":"additional","affiliation":[{"name":"Department of Hand Surgery Tehran University of Medical Sciences  Tehran Iran"},{"name":"Department of Plastic Surgery Shahid Beheshti University of Medical Sciences  Tehran Iran"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-4750-4577","authenticated-orcid":false,"given":"Amirhossein","family":"Faghihi","sequence":"additional","affiliation":[{"name":"Department of Hand Surgery Tehran University of Medical Sciences  Tehran Iran"},{"name":"Department of Plastic Surgery Shahid Beheshti University of Medical Sciences  Tehran 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