Impact of neck dissection on scapular muscle function: a case-controlled electromyographic study.

Area of Science:

• Orthopedics
• Neurology
• Rehabilitation Medicine

Background:

• Neck dissection surgery can lead to accessory nerve dysfunction, affecting shoulder function.
• Scapular muscle activity is crucial for shoulder stability and movement.

Purpose of the Study:

• To evaluate the dynamic activity of scapular muscles in patients with accessory nerve dysfunction post-neck dissection.
• To compare muscle activity between the affected side, unaffected side, and healthy controls.

Main Methods:

• A case-control study involving 20 participants (10 neck dissection patients, 10 controls).
• Surface electromyography (sEMG) assessed upper trapezius, middle trapezius, rhomboid major, and serratus anterior muscles.
• Dynamic scapular strengthening exercises were performed to measure muscle activity.

Main Results:

• Patients with accessory nerve dysfunction showed significantly reduced upper and middle trapezius activity on the affected side compared to controls and their unaffected side.
• The unaffected side also exhibited reduced upper trapezius activity compared to the control group.

Conclusions:

• Accessory nerve dysfunction following neck dissection results in significant trapezius muscle weakness on both sides.
• Rehabilitation programs for these patients must address this muscle dysfunction for optimal recovery.