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Related Experiment Video

Updated: Jan 29, 2026

In Vivo Electrophysiological Measurement of the Rat Ulnar Nerve with Axonal Excitability Testing

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Published on: February 6, 2018

Changes in Ulnar Variance after a Triangular Fibrocartilage Complex Tear.

Jung-In Shim¹, Jin-Hyung Im², Joo-Yup Lee¹

¹Department of Orthpaedic Surgery, St. Vincent's Hospital, Catholic University of Korea, Gyeonggi-Do, Korea.

Journal of Wrist Surgery

|February 7, 2019

Summary

Triangular fibrocartilage complex (TFCC) tears can alter ulnar variance, potentially causing ulnar impaction syndrome. While TFCC repair initially reduces ulnar variance, it tends to increase over time, contributing to wrist pain.

Keywords:

distal radioulnar joint triangular fibrocartilage complex ulnar impaction syndrome ulnar shortening osteotomy ulnar variance

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Area of Science:

Orthopedic Surgery
Wrist Biomechanics
Musculoskeletal Disorders

Background:

The relationship between triangular fibrocartilage complex (TFCC) tears and ulnar impaction syndrome is not fully understood.
TFCC tears may alter ulnar variance, potentially leading to ulnar impaction syndrome.

Purpose of the Study:

To investigate the hypothesis that TFCC tears change ulnar variance, contributing to ulnar impaction syndrome.
To evaluate the effect of TFCC foveal repair on ulnar variance and clinical outcomes.

Main Methods:

Retrospective study of 72 patients undergoing TFCC foveal repair.
Comparison of ulnar variance (preoperative, postoperative, follow-up) with contralateral wrists.
Assessment of clinical outcomes including range of motion, VAS pain, grip strength, and QuickDASH scores.

Main Results:

Ulnar variance increased post-TFCC tear and decreased after TFCC repair.
Ulnar variance increased again at last follow-up in both groups.
Significant improvements noted in VAS pain, QuickDASH scores, and grip strength; limited improvement in range of motion.

Conclusions:

TFCC tears can alter ulnar variance, which may contribute to ulnar impaction syndrome.
TFCC repair offers initial improvement, but the recurrence of increased ulnar variance over time warrants further investigation.
Findings suggest a potential mechanism for ulnar-sided wrist pain following TFCC tears.