This observational study aims to investigate the relationships between proprioception, causes of kinesiophobia, sensory processing characteristics, and functional recovery in individuals undergoing gonarthrosis surgery. Postoperative functional recovery can be influenced by sensorimotor and psychological factors such as impaired proprioception, fear of movement, and changes in sensory processing. However, the interaction between these factors has not been sufficiently clarified. Participants will complete a sociodemographic and clinical information form, the Western Ontario and McMaster University Osteoarthritis Index (WOMAC), the Causes of Kinesiophobia Scale, and the Adolescent/Adult Sensory Profile. Proprioception will be assessed using the Joint Position Perception Test.

Inclusion Criteria:

• The study included individuals aged 50-75 years who had undergone unilateral total knee arthroplasty and were 4-6 weeks post-operatively. Participants were required to have the cognitive capacity to understand the study instructions and to be able to walk independently.

Exclusion Criteria:

• Individuals who had undergone bilateral total knee arthroplasty, those with advanced osteoarthritis in the other knee, those with neurological or orthopedic diseases affecting mobility, those who had undergone another major joint surgery within the last six months, and those with vestibular system disease were excluded from the study.

The study population will consist of individuals who have undergone surgery for gonarthrosis and are admitted for follow-up evaluation at an orthopedic clinic. Participants who meet the inclusion criteria and provide informed consent will be included. The study will evaluate the relationship between proprioception, causes of kinesiophobia, sensory processing characteristics, and functional recovery in this population.