Wrist extension strength changes after extensor carpi radialis brevis release in the lateral epicondylitis.

Purpose: Lateral epicondylitis (LE) is often attributed to degenerative changes and microscopic ruptures in the extensor carpi radialis brevis (ECRB). Surgical procedures, such as arthroscopic or open ECRB release, are commonly used to address this condition. However, there is limited research on changes in wrist muscle strength and their clinical impact after ECRB release. This study aims to investigate the changes in wrist extension strength following ECRB release in patients with lateral epicondylitis.

Methods: A retrospective study was conducted involving thirty-six right-handed patients who underwent open ECRB release at a single institution. Wrist extension strength was measured using a Biodex system during both the initial and two-year follow-up clinical visits. Additionally, clinical outcomes were assessed using the Disabilities of the Arm, Shoulder, and Hand (DASH) score, pain visual analog scale (pain VAS), grip strength, and wrist extension strength. Correlations among these factors were analyzed to explore potential associations.

Results: Significant improvements were observed in all clinical outcomes, including grip strength and wrist extension strength, following ECRB release. However, at the two-year follow-up, a statistically significant decrease in wrist extension strength was noted compared to the unaffected arm. Despite this decrease, there were no adverse effects on the clinical outcomes (DASH, pain VAS) or grip strength.

Conclusion: Our study demonstrated a decrease in wrist extension power following ECRB release, which did not significantly impact clinical outcomes. Therefore, we recommend that clinicians inform patients about the potential reduction in wrist extension strength and incorporate wrist extension strengthening exercises into postoperative rehabilitation protocols to facilitate recovery to normal levels.

Level of evidence: III.