'Lumbar Stiffness Disability Index' Turkish Adaptation

The development and evaluation of the Turkish version of the Lumbar Stiffness Disability Index (LSDI) are planned. After ensuring the eligibility of adult participants included in the study, language validity will be established for the Turkish version of LSDI, and internal consistency will be assessed using Cronbach's alpha coefficient. Additionally, the test-retest reliability of the index will be evaluated by reapplying it to participants with a one-week interval. For external structure validity, LSDI scores will be correlated with Oswestry Disability Index, Functional Reach Test, and goniometric measurements. The study will include demographic data and measurements to examine the eligibility of individuals with specific medical conditions for the intervention.