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Arch Hand Microsurg > Volume 24(4); 2019 > Article
Archives of Hand and Microsurgery 2019;24(4):303-310.
Published online December 1, 2019.
Dorsal Translation of Ulnar Head after the Arthroscopic Wafer Procedure for Ulnar Impaction Syndrome
Keonhee Yun1, Ki Jin Jung2, Jae-Hwi Nho3, WhiJe Cho1, Byung Sung Kim1
1Department of Orthopedic Surgery, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
2Department of Orthopedic Surgery, Soonchunhyang University Cheonan Hospital, Cheonan, Korea.
3Department of Orthopedic Surgery, Soonchunhyang University Seoul Hospital, Seoul, Korea.
Received: 24 July 2019   • Revised: 16 September 2019   • Accepted: 22 September 2019
The purpose of this study was to evaluate the results of the arthroscopic wafer procedure (AWP) for ulnar impaction syndrome (UIS) and identify preoperative factors and degree of distal radioulnar joint (DRUJ) translation that could assist in predicting outcomes.

We retrospectively reviewed the medical records of 9 patients (11 wrists) who underwent AWP for UIS. Among these, 5 cases were converted to secondary ulnar shortening osteotomy and were categorized to group A and the remaining 6 cases were categorized to group B. The ulnar variance (UV), radioulnar ratio (RUR) by computed tomography or magnetic resonance imaging (MRI), MRI evidence of mechanical impaction in the ulnar or lunate, grip power, Disability of Shoulder, Arm and Hand (DASH) score, and Mayo wrist score were examined before and after AWP.

The MRI evidence did not differ significantly between groups A and B (p>0.05). The average UV and RUR changed from 1.6±0.7 mm and 0.68±0.17 before AWP to −1.5±0.9 mm and 0.54±0.10 after AWP, respectively. The difference between the preoperative RUR (0.65) and postoperative RUR in group B (0.49) was significant (p=0.027, Pearson correlation coefficient=0.862). The grip strength, DASH score, and Mayo wrist score improved from 77.1%, 47.6, and 69.1 to 85.2%, 16.8, and 85.5, respectively.

If patients have persisting pain and DRUJ dorsal translation is not reduced after wafer procedure, secondary ulnar shortening osteotom may be required.
Key Words: Ulnar head, Dorsal translation, Arthroscopy

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