Pain coping strategies with functional disability and quality of life in patients with knee osteoarthritis in Lagos, Nigeria

Abstract

The significant impact of coping strategies on the experience of pain and disease outcome has been associated with cultural and environmental factors. There is a dearth of studies in this environment on the association of coping strategies with clinical symptoms in patients with OA knee. This study investigated the relationship among pain coping strategy, functional disability, pain and quality of life among patients with knee osteoarthritis in Lagos, Nigeria. Involved were 102 participants diagnosed with either bilateral or unilateral Knee OA. Numerical pain rating scale (NPRS), The Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC osteoarthritis index), Pain coping inventory (PCI) and SF-36 Health survey were used to evaluate participants’ pain, functional disability, pain coping strategy and quality of life (QoL) respectively. Results showed a passive pain coping index (PPCI) score of 45.89±6.49 as against 26.5±43.61 for the active pain coping index (APCI). PPC strategies were significantly related positively with pain and functional disability (p<0.001; r = 0.380 and p= 0.001; r=0.334 respectively) but correlated negatively (p<0.001) with all domains of QoL except for mental health. On the other hand, APC strategies correlated negatively with pain and functional disability (p=0.092; r = -0.168 and p= 0.334; r= -0.131). Our findings thus suggest a significant association between PPCS and severe pain, functional disability and poor QoL while APCS was associated with a better quality of life in patients with knee OA. It is thus suggested that active pain coping strategies be  incorporated into the management of patients with OA knee.

Keywords: Pain coping strategy, Knee osteoarthritis, Pain coping index, Numerical pain rating scale