Kinematics and Muscle Activation of Scapula in Upper String Players With Neck Pain

Inclusion Criteria: * Age ≥ 18 years old. * Having at least 5 years of string instrument playing experience and practicing for more than 6 hours per week. * For the neck pain group: Experiencing non-specific neck pain for at least 2 weeks, with pain located between the superior nuchal line and the T1 spinous process, and a pain intensity of at least 3 on the Numeric Rating Scale (NRS ≥ 3). * For the healthy control group: Having no history of neck or shoulder pain within the past year (matched with the neck pain group by age, gender, and handedness). Exclusion Criteria: * History of any neck or shoulder surgery or fracture. * Experiencing pain below the elbow with an intensity of at least 3 (NRS ≥ 3). * Diagnosed history of any structural cervical spine issues, such as herniation of intervertebral disc (HIVD), cervical spine spondylosis, or spondylolisthesis. * Positive response on any of the following 5 cervical spine screening tests: cervical distraction test, Spurling's test, Valsalva test, rotational alar ligament stress test, or Sharp-Purser test. * Any neurological disorders. * Pregnancy during the study period.