Due to the limited number of studies investigating the relationship between kinesiophobia, radiographic parameters, and clinical outcomes in patients with Femoroacetabular Impingement Syndrome (FAIS) in the literature, the aim of this study is to evaluate the relationship between kinesiophobia and clinical parameters in patients with FAIS.

Femoroacetabular Impingement Syndrome (FAIS) is defined as a condition in which abnormalities in the femoral and acetabular anatomy lead to abnormal contact and mechanical forces along the joint, resulting in labral and chondral pathologies.

Symptomatic patients with Femoroacetabular Impingement Syndrome (FAIS) typically present with pain, primarily in the groin but also potentially in the lower back, hip, and posterior thigh. In addition to pain, patients may complain of a mechanically perceptible 'click' sound, locking sensation, or instability in the hip. Symptoms particularly worsen with activities such as squatting, hip rotation, sitting, climbing stairs, and prolonged sitting. The resulting symptoms lead to a decrease in functional capacities related to physical activities.

The radiographic measurements of the FAIS-Cam deformity are typically done using the alpha angle. An angle of 58 degrees or higher is considered abnormal. However, abnormal morphology is not always indicative of a pathological lesion. A holistic approach, including patient symptoms and a physical examination, is necessary for a comprehensive assessment.

In patients with Femoroacetabular Impingement Syndrome (FAIS), hip biomechanics notably change during activities such as walking, squatting, and climbing stairs. Due to pain, individuals with FAIS may exhibit protective behaviors, such as keeping the hip in flexion or adopting a Trendelenburg gait to avoid loading forces on the extremity. This situation can lead to kinesiophobia, defined as an exaggerated fear of movement and avoidance behavior based on the belief that movement may lead to injury. In patients with FAIS, it is believed that high levels of kinesiophobia are associated with lower physical function.

The participants' sociodemographic information will be recorded using a Sociodemographic Information Form. For pain assessment, the Visual Analog Scale and Algometer will be employed. Joint range of motion will be measured using the Clinometer mobile application, hip asymmetry will be assessed through the Weight Bearing Asymmetry Test using a scale, movement fear will be gauged using the Tampa Kinesiophobia Scale, and hip dysfunction will be evaluated using the Harris Hip Score. Additionally, the "Sit-to-Stand Test" will be utilized for functional measurement. The alpha angle for patients will be evaluated through pelvic anteroposterior radiography.

Inclusion Criteria:

• Being between the ages of 18 and 65
• Being diagnosed with 'cam' type femoroacetabular impingement syndrome
• Having no surgical history in the hip area and its vicinity within the last 1 year
• Having filled out the informed consent form

Exclusion Criteria:

• Having a history of psychological and mental illness
• Having another illness with symptoms that may overlap with FAI symptoms
• Refusing to participate in the study

Our study will include 23 patients diagnosed with FAI between the ages of 18 and 65 who have agreed to participate in the study. All participants will receive detailed information about the study, and a written informed consent form will be provided for them to voluntarily sign, indicating their acceptance of participating in the study.

Participants will be individuals who are not candidates for surgery during the treatment process and will be selected from patients who have not undergone surgery before. The inclusion criteria involve receiving a diagnosis of 'cam' type femoroacetabular impingement syndrome through radiographic and physical examination assessments.