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Osteoarthritis (OA) is a common type of arthritis, affecting millions of people around the world. Angiopoietin-2 (Angpt-2) has a role in the development of chronic inflammatory diseases. We aimed to assess the serum Angpt-2 levels in knee OA patients and to investigate the association of  Angpt-2  gene polymorphism(rs3020221 C/T) with knee OA susceptibility and severity.  Angiopoietin-2 (rs3020221C/T) gene polymorphism was identified in 254 knee OA patients and 227 healthy controls using real-time polymerase chain reaction. Serum Angpt-2 was measured using ELISA. The Arabic version of the Western Ontario and McMaster Universities Osteoarthritis (WOMAC) Index and Kellgren-Lawrence (KL) grading score were used to assess the clinical and radiological severity of OA and their relationship with  Angpt-2 (rs3020221C/T) gene polymorphism was investigated. Serum Angpt-2 levels were significantly higher in knee OA patients than in the controls ( P  = .001). OA patients with C/T genotype had a four times greater risk of developing OA than other genotypes (OR = 4.39, 95% CI = 2.85–6.76). Additionally, the T allele presented more in OA patients 224/508 (44%) with two times risk of developing OA (OR = 1.86, 95% CI = 1.43–2.43, p = .001).  Angpt-2  SNP (rs3020221C/T) genotype C/T was significantly associated with elevated serum Angpt-2 levels (14.15 ± 5.62 ng/ml). The serum Angpt-2 levels are significantly elevated in OA patients and  Angpt-2  gene polymorphism (rs3020221 C/T) may be a risk factor for OA development and both are associated with the severity of knee OA. Carriers of the C/T genotype have a significantly higher serum Angpt-2 levels and a greater risk of developing OA.

The Association of Angiopoietin-2 1064 C/T Rs3020221 Gene Polymorphism with Knee Osteoarthritis