Investigation of the Effectiveness of Short Wave Diathermy Treatment in Patients With Hand Osteoarthritis

The aim of this randomized, double-blind, placebo-controlled study was to evaluate the effects of shortwave diathermy therapy on pain, grip strength, and functionality in patients with hand osteoarthritis.

Patients who apply to the physical medicine and rehabilitation outpatient clinic between January 2024 and February 2025 will be included in the study according to the inclusion and exclusion criteria specified below. Demographic data of the patients such as age, gender, height, and weight will be recorded. In the initial evaluation, VAS, hand dynamometer and pinchmeter measurements, Duruöz Hand Index questionnaire and Moberg Addition Test results of the patients will be noted. The G\*Power 3.1 (Faul, Erdfelder, Lang, and Buchner, 2007) program was used to calculate the sample size. In the comparisons of different parameters between groups in reference studies, the effect size was calculated to be at the level of 0.9. This corresponds to a large level according to Cohen's effect size classification. Accepting a statistical significance coefficient of 0.05 with an effect size of 0.9, it was decided to include a minimum of 16 people in each group to obtain 80% power. A total of 36 patients (with a 10% drop-out margin) will be included in the study and will be randomly divided into two groups as treatment and control groups. Randomization will be done by closed envelope method. The treatment group will be given 15 sessions: 20 minutes (27.12 MHz, continuous mode, 400W output) short wave diathermy treatment, hand osteoarthritis exercise program. The control group will be given 15 sessions: sham short wave diathermy and hand osteoarthritis exercise program. Patients will complete 15 sessions, 1 session per day, 5 sessions per week. All evaluation parameters will be recorded before treatment, at the end of treatment and at the end of treatment at the 12th week. Intra-group and inter-group differences will be examined statistically.