Effect of vitamin D levels on radiographic knee osteoarthritis and functional status

Özet

Objectives: This study aims to investigate the effect of serum levels of 25 hydroxyvitamin D (25(OH)D) in patients with primary kneeosteoarthritis (OA) and to assess its relationship with the radiographic grading and functional status.Patients and methods: Serum 25(OH)D levels were measured in 107 patients (90 females, 17 males; mean age 63.0±9.6 years; range, 40 to86 years) with primary knee OA. Radiographic grading was based on the Kellgren-Lawrence Grading Scale and the Osteoarthritis ResearchSociety International (OARSI) Atlas Grading Scale, while the functional status was assessed using the Lequesne indices and Turkish versionof the Knee Injury and Osteoarthritis Outcome Score-Physical Function Short-Form (KOOS-PS). Pain was evaluated using the Visual AnalogScale for Pain (VAS-Pain). Data including age, sex, disease duration, body mass index (BMI), and pain severity were recorded.Results: The mean 25(OH)D level was 13.4±10.6 ng/mL, and 90 patients (84.1%) had vitamin D deficiency. The presence of severe osteophyteswas observed in 67 patients (62.6%) and 85 patients (79.4%) had Grade 2-3 joint space narrowing (JSN). The mean KOOS-PS and Lequesnescores were 40.1±12.3 and 12.9±3.6, respectively. There was no correlation between serum 25(OH)D levels and functional status.Conclusion: Our study results show that serum 25(OH)D level is not related to the severity of the radiographic knee OA grading or to thefunctional assessment. Age and BMI are the factors affecting the radiological knee OA severity, while age, sex, BMI, and pain severity are themain determinants of the functional status.