Peroxisome proliferator-activated receptor (PPAR): a type of nuclear hormone receptor within cells that ultimately affects gene expression. There are 3 types of PPARs: alpha, gamma, and beta/delta. These receptors play a major role in the maintenance of metabolism, cell differentiation, and inflammation.
QUESTION
The term arthritis refers to stiffness in the joints. See AnswerFrom 
Arthritis Resources
Health Solutions From Our Sponsors
References
Tyagi et al. The peroxisome proliferator-activated receptor: A family of nuclear receptors role in various diseases. J Adv Pharm Technol Res. 2011 Oct-Dec; 2(4): 236–240.