ArticleHealthcare (Basel, Switzerland)2025
Motor Innervation of the Trapezius by Cervical Sensitive Nerves: An Intraoperative Neuromonitoring Study and Postoperative Functional Outcomes.
Article in Healthcare (Basel, Switzerland), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
BACKGROUND/
objectivesWe investigated whether cervical sensitive nerves (CSN) provide motor input to the trapezius muscle and how this relates to short-term functional outcomes after neck dissection.
methodsA total of 22 neck dissections were performed in 17 patients; the SAN was preserved. CSN roots (C2-C4) were stimulated intraoperatively using IONM. Shoulder and neck function were evaluated preoperatively and at 3 months in 15 operated necks using goniometry, an IMU-based motion analysis system (iSen), trapezius isometric strength, the Modified Constant-Murley Score (MCMS), and the Shoulder Pain and Disability Index (SPADI).
resultsCSN-evoked trapezius responses were detected in 10/22 (45.5%) dissections (C2: 6/22, 27.2%; C3: 4/22, 18.2%; C4: 0/22). Postoperatively, neck extension/rotation and shoulder abduction/external rotation decreased significantly within groups; upper and middle trapezius strength and MCMS also declined. Shoulder flexion loss was smaller when CSN motor participation was present. Median shoulder flexion (goniometry) changed from 162°→140° in CSN(+) vs. 170°→131° in CSN(-) (between-group
conclusionsApproximately half of the neck dissections exhibited CSN-related motor responses. Short-term shoulder flexion was better preserved when CSN motor participation was present, suggesting that documenting CSN motor input intraoperatively may inform early rehabilitation planning.
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