Zeki Günsoy1, Mustafa Dinç2, Ömer Cevdet Soydemir2

1Department of Hand Surgery, Health Sciences University, Bursa, Türkiye
2Department of Orthopedics and Traumatology, Health Sciences University, Bursa, Türkiye

Keywords: Abductor pollicis brevis, carpal tunnel syndrome, electric stimulation, muscle contraction, opponensplasty


Objectives: In this study, we aimed to investigate the relationship between intraoperative thenar muscle neurostimulation responses and postoperative thumb function recovery in patients with severe carpal tunnel syndrome (CTS).

Patients and methods: Between January 2019 and December 2021, a total of 21 severe CTS cases in 20 patients (7 males, 13 females; mean age: 56.3±19.3 years; range, 52 to 76 years) based on clinical and electrophysiological findings were retrospectively analyzed. The median nerve motor branch (MNMB) was stimulated intraoperatively with a nerve stimulator. The patients were divided into two groups according to contraction response on abductor pollicis brevis (APB) muscle: Group C (contractile, n=13) and Group NR (non-responsive, n=7) with and without muscular contraction. The Levine Functional Severity Scale (LFSS) was used to measure the functional status of CTS patients. The Manual Muscle Testing (MMT) was used to assess muscle strength. Clinical outcomes were compared between the groups at one year of follow-up.

Results: The mean total preoperative LFSS score was significantly higher in Group NR than in Group C (p=0.010). The mean postoperative MMT score was significantly higher in Group C than in Group NR (p<0.001). There was no positive result in pick-up, button fastening, and needle pinch tests in Group NR (p<0.001). However, there were significant improvements in postoperative LFSS scores in Group C (p<0.05), while the scores remained unchanged in Group NR (p>0.05).

Conclusion: Direct stimulation of the median nerve motor branch and observation of contraction response on APB muscle can be used to predict clinical recovery and facilitates making the decision for opponensplasty in severe CTS.

Citation: Günsoy Z, Dinç M, Soydemir ÖC. Neurostimulation in severe carpal tunnel release: A more precise technique for opponensplasty decision-making. Jt Dis Relat Surg 2023;34(3):707- 715. doi: 10.52312/jdrs.2023.919.

Ethics Committee Approval

The study protocol was approved by the Bursa State Hospital Ethics Committee (date: 14.07.2021, no: 2021-13/1). The study was conducted in accordance with the principles of the Declaration of Helsinki.

Author Contributions

All authors contributed equally to the article.

Conflict of Interest

The authors declared no conflicts of interest with respect to the authorship and/or publication of this article.

Financial Disclosure

The authors received no financial support for the research and/or authorship of this article.

Data Sharing Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.