Osteoporosis (OP) is a bone disease characterized by reduced bone density and deterioration of bone tissue, leading to an increased risk of fractures. There are no studies evaluating Q angle in patients with OP and Osteopenia (OPN) in the literature. Therefore, the aim of this study was to examine the Q angle in patients diagnosed with OP and OPN and to compare it with patients diagnosed with OA. The study will be carried out by measuring the Q angle measurement with a goniometer. Pain assessment will be done with Visual Analog Scale (VAS). Lower extremity muscle strength will be assessed with the Medical Research Council (MRC) Scale. Foot posture will be assessed with the Foot Posture Index (FPI).