• Ma Tianxiao, Dongyue Wang, and Lihua Song.
• Department of Orthopaedic Surgery, The Orthopaedics Hospital of Xingtai City, Xingtai, Hebei, P.R. China.
• Medicine (Baltimore). 2020 Sep 25; 99 (39): e22294e22294.

RationaleKirner's deformity is an uncommon deformity of finger, characterized by palmo-radial curvature of distal phalanx of the fifth finger. The specific mechanism remains unknown yet. This study aims to present a case report to add the knowledge on this type of deformity.Patient ConcernsA 9-year-old girl presenting with deformity of her fifth finger since she was born was admitted to our hand surgery clinic. MRI findings showed widened epiphyseal plate, L-shaped physis, but normal flexor digitorum profundus tendon insertion, without any significantly enhanced soft issues.DiagnosisKirner's deformity of the fifth finger.InterventionsWe presented 2 surgical choices for the patient: one was wedge osteotomy of the distal phalanx to correct the mechanical line of the distal phalanx and fixation with Kirschner wire and the other one was cut-off of deep flexor tendon insertion with brace immobilization, but her guardians refused either of them.OutcomesConsecutive follow-up was performed for 19 months after the first visit, showing no any change in finger shape and function.LessonsThe L-shaped epiphyses may be the cause of Kirner's deformity and further attention should be paid on in the clinic. This case report provided a basis for the etiological diagnosis and future treatment of Kirner's deformity.

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