“…Using this guideline in patients with RA, SPA, and SLE is complicated by the poor functional capacity of many patients prior to THA and TKA, when poor functional capacity is defined as the inability to achieve at least 4 Metabolic Equivalents (METS), achieved by light shoveling, dancing, or gardening, defining "light" as when the activity results in "only minimal perspiration and only a slight increase in breathing above normal" [69]. Moreover, patients with RA with cardiovascular disease may not have symptoms [48,70,71]. Using the classic Framingham risk equation (based on age, sex, total cholesterol level, high density lipoprotein cholesterol level, smoking history, and systolic blood pressure), patients with RA, SPA, and SLE may fall into a low risk category, leading some to add the presence of a systemic inflammatory disease such as RA, SPA, and SLE to the list of traditional cardiovascular risk factors, or to add a multiplication factor of 1.4 to the calculation of cardiac risk, recognizing that the current risk assessment tools are unreliable and underestimate cardiac risk in patients with RA, SPA, and SLE [51,[72][73][74][75][76].…”