Chair-Integrated Foam Modifications in Coccydynia

Inclusion Criteria: * Aged between 18 and 65 years * Working at a desk for at least 5-6 hours per day * Experiencing coccydynia (tailbone pain) * Able to sit independently without assistive support * No diagnosed spinal disorders (e.g., lumbar disc herniation) * Willing to use the assigned chair during working hours for 1 week * Able to understand and complete questionnaires * Provided written informed consent Exclusion Criteria: * History of spinal surgery * Diagnosed spinal disorders (e.g., lumbar disc herniation, scoliosis, severe degenerative spine disease) * Neurological disorders affecting posture, sitting balance, or sensation * Severe musculoskeletal conditions (e.g., hip or pelvic disorders) that may affect sitting * Pregnancy * Inability to sit for prolonged periods * Use of assistive seating devices (e.g., orthopedic cushions) during the study period * Regular use of pain medication that may affect outcome measures