J Wrist Surg
DOI: 10.1055/s-0044-1787748
Scientific Article

How does Fixation Alignment Affect Surgical Outcomes in Arthrodesis for Thumb Carpometacarpal Osteoarthritis?

1   Department of Orthopaedic Surgery, Gifu University Graduate School of Medicine, Gifu, Japan
,
Akihiro Hirakawa
1   Department of Orthopaedic Surgery, Gifu University Graduate School of Medicine, Gifu, Japan
,
Hitoshi Hirose
1   Department of Orthopaedic Surgery, Gifu University Graduate School of Medicine, Gifu, Japan
,
Atsushi Kawaguchi
2   Department of Orthopaedic Surgery, Hashima City Hospital, Gifu, Japan
,
Yoshiki Ito
3   Department of Orthopaedic Surgery, Central Japan International Medical Center, Gifu, Japan
,
Haruhiko Akiyama
1   Department of Orthopaedic Surgery, Gifu University Graduate School of Medicine, Gifu, Japan
› Institutsangaben
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Abstract

Purpose Arthrodesis is a traditional surgical procedure for treating thumb carpometacarpal (CMC) osteoarthritis. Previous studies have investigated surgical outcomes, focusing on the fixation technique, bone union rate, and surgical complications but not on the postoperative alignment of the thumb CMC joints. Therefore, we aimed to investigate how thumb fixation alignment affects the surgical outcomes of thumb CMC arthrodesis.

Patients and Methods Twenty-six patients (28 thumbs) who achieved bone union after arthrodesis with more than 1-year follow-up were retrospectively analyzed. We measured the radial abduction and palmar abduction angles and change in thumb length (Δthumb length) on postoperative radiographs and the first metacarpal rotation angle on postoperative computed tomography. Moreover, we investigated the 1-year clinical outcomes, including the Disabilities of Arm, Shoulder, and Hand (DASH) score, Hand20 questionnaire score, visual analog scale (VAS) score for pain, Δgrip strength, Δpulp pinch, and Δkey pinch strength. The correlation between the postoperative alignment and clinical outcomes was also statistically analyzed.

Results The mean radial abduction, palmar abduction, first metacarpal rotation angles, and Δthumb length were 20.8 degrees, 34.4 degrees, 109.4 degrees, and −1.8 mm, respectively. Radial abduction and palmar abduction angles were positively and negatively correlated with Δgrip strength (r = 0.37 and −0.37), respectively. The first metacarpal rotation angle was positively correlated with the DASH score (r = 0.51), Hand20 score (r = 0.48), and VAS score for pain (r = 0.42). ΔThumb length had no correlation with clinical outcomes at 1-year follow-up.

Conclusion Thumb fixation alignment has an impact on the surgical outcomes of thumb CMC arthrodesis. To obtain a successful outcome, it is important to add slight pronation and avoid excessively small radial abduction and excessively large palmar abduction.

Ethical Considerations

This retrospective study was approved by the institutional review board of Gifu University Graduate School of Medicine (2018–217).


Authors' Contributions

S.K. designed the study. S.K., A.H., H.H., and A.K. performed the operation. S.K., Y.I., A.K., and H.A. analyzed the data and wrote the manuscript.


Ethical Approval

This retrospective study was approved by our institutional review board.


Informed Consent

Informed consent was obtained from all patients included in the study.


Supplementary Material



Publikationsverlauf

Eingereicht: 21. März 2024

Angenommen: 21. Mai 2024

Artikel online veröffentlicht:
05. Juli 2024

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