{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,5,14]],"date-time":"2025-05-14T01:49:58Z","timestamp":1747187398672,"version":"3.40.5"},"reference-count":17,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2021,6,10]],"date-time":"2021-06-10T00:00:00Z","timestamp":1623283200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Orthopaedic Surgery"],"published-print":{"date-parts":[[2021,7]]},"abstract":"Objective<\/jats:title>Complex base fractures of the fifth metacarpal bone and dislocation of the fifth carpometacarpal joint are more prone to internal rotation deformity of the little finger sequence after fixation with a transarticular plate. In the past, we have neglected that there is actually a certain angle of external rotation in the hamate surface of transarticular fixation. This study measured the inclination angle of the hamate surface relative to the fifth metacarpal surface for clinical reference.<\/jats:p><\/jats:sec>Methods<\/jats:title>In a prospective single\u2010center study, we investigated the tilt angle of 60 normal hamates. The study included thin\u2010layer computed tomography (CT) data from 60 patients from the orthopaedic clinic and inpatient unit from January 2017 to March 2020, including 34 men and 26 women who were 15~59\u2009years old, average 35\u2009years old. The CT data of 60 cases in Dicom format of the hand was input into Mimics and 3\u2010Matics software for three\u2010dimensional (3D) reconstruction and measuring the angle \u03b1 between hamate surface and the fifth metacarpal surface. According to the possible placement of the transarticular plate on the fifth metacarpal surface, we measured the angle \u03b2 between the hamate surface 1 and the fifth metacarpal surface and the angle \u03b3 between the hamate surface 2 and the fifth metacarpal surface.<\/jats:p><\/jats:sec>Results<\/jats:title>The average angle between the hamate surface and the fifth metacarpal surface was 11.66\u00b0. The hamate surfaces 1 and 2 have an external rotation angle of 7.30\u00b0 and 7.51\u00b0 on average with respect to the fifth metacarpal surface, respectively. There is no statistically significant difference in the angles between the two groups (P<\/jats:italic>\u00a0>\u20090.05).<\/jats:p><\/jats:sec>Conclusions<\/jats:title>The horizontal angle of the dorsal side of the hamate is different from the back of the fifth metacarpal surface, and the hamate has a certain external rotation angle with respect to the fifth metacarpal surface. No matter how the transarticular plate is placed, the plate always has a certain external rotation angle relative to the fifth metacarpal surface. When the fixation is across the fifth carpometacarpal joint, if the plate does not twist and shape, it will inevitably cause internal rotation of the fifth metacarpal, resulting in internal rotation deformity of the little finger sequence.<\/jats:p><\/jats:sec>","DOI":"10.1111\/os.13028","type":"journal-article","created":{"date-parts":[[2021,6,10]],"date-time":"2021-06-10T21:47:51Z","timestamp":1623361671000},"page":"1596-1601","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The Measurement of the Inclination Angle of the Hamate and Analysis of the Inclination Angle for the Rotation Deformity of the Little Finger in the Fixation of the Carpometacarpal Joint"],"prefix":"10.1111","volume":"13","author":[{"given":"Yimin","family":"Qi","sequence":"first","affiliation":[{"name":"Department of Orthopaedic Surgery Nanjing First Hospital, Nanjing Medical University Nanjing 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