This interventional clinical study investigates the effectiveness of applying a forearm strap orthosis in 30 individuals experiencing forearm pain due to playing a musical instrument. Participants used the orthosis for 4 weeks. The primary objective is to evaluate the changes in pain levels and grip strength following this period. The study also explores the potential of this intervention to improve functionality and quality of life.

The therapeutic and biomechanical effects of orthoses are utilized in the management of musculoskeletal disorders frequently encountered in instrumental musicians; this interventional study aims to prospectively evaluate the effect of a standardized forearm strap orthosis intervention on pain intensity, grip strength, and upper extremity functionality after a 4-week usage period in instrumental musicians. The study employs an Interventional type, single-group assignment, non-randomized pre-post design, enrolling 30 individuals from the Sulukule Art Academy of Fatih Municipality who meet the inclusion criteria. The primary outcome measures are the McGill Melzack Pain Questionnaire and Visual Analogue Scale (VAS) scores, grip strength values measured with the Jamar dynamometer, and Disabilities of the Arm, Shoulder, and Hand (DASH-T) Questionnaire scores, all obtained pre- and post- orthosis use. The secondary outcome measure is the evaluation of quality of life using the Short Form 36 (SF-36) Quality of Life Survey.

Inclusion Criteria:

• Participants were between 18 and 55 years old at the time of enrollment.
• Participants had been playing an instrument for more than six months.
• Participants had been playing an instrument for at least one hour a day.
• Participants were willing and able to adapt to orthotic treatment.

Exclusion Criteria:

• Participants had a history of surgery and/or trauma to the elbow where orthosis treatment was required.
• Participants were receiving physiotherapy treatment within the last 6 months.
• Participants had an acute injury that prevented performance.

Individual participant data (IPD) will not be shared. This decision is based on the informed consent provided by the participants, which did not grant permission for future data sharing beyond the scope of the original research project. Additionally, the study's sponsor does not possess the institutional infrastructure or dedicated resources required to de-identify, host, and manage a controlled data access platform for external investigators. The study results will be published in the scientific literature as aggregate data to ensure patient confidentiality and compliance with ethical approvals.