Turkish Journal of Physical Medicine and Rehabilitation 2015 , Vol 61 , Num 4
Effect of Vitamin D levels on radiographic knee osteoarthritis and functional status
Bedriye Mermerci Başkan ,Fatma Gül Yurdakul ,Ezgi Aydın ,Filiz Sivas ,Hatice Bodur
1 Department of Physical Medicine and Rehabilitation, Ankara Numune Training and Research Hospital, Ankara, Turkey DOI : 10.5606/tftrd.2018.986 Objectives: This study aims to investigate the effect of serum levels of 25 hydroxyl vitamin D (25(OH)D) in patients with primary knee osteoarthritis (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 62.96±9.55 years ; range 40 to 86 years) with primary knee OA. Radiographic grading was based on the Kellgren-Lawrence Grading Scale and the Osteoarthritis Research Society International (OARSI) Atlas Grading Scale, while the functional status was assessed using the Lequesne indices and Turkish version of the Knee Injury and Osteoarthritis Outcome Score-Physical Function Short-Form (KOOS-PS). Pain was evaluated using the Visual Analog Scale 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 13.40±10.63 ng/mL, and 90 patients (84.1%) had vitamin D deficiency. The presence of severe osteophytes was observed in 67 patients (62.6%) and 85 patients (79.4%) had Grade 2-3 joint space narrowing (JSN). The mean KOOS-PS and Lequesne scores were 40.07±12.25 and 12.91±3.55, 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 the functional assessment. Age and BMI are the factors affecting the radiological knee OA severity, while age, sex, BMI, and pain severity are the main determinants of the functional status. Keywords : Functional status; knee osteoarthritis; radiographic grading; vitamin D