Table 2

Summary of the main findings related to outcome prognostic factors for hip joint replacement

Outcome prognostic factor	Revision	All-cause mortality	Function	Postoperative pain
Age	+/−	+/+	+/+	Not evaluated
	Age not significant for 3 mo–3 yr or 1–3 yr (n = 6) (16)^– (21) Younger patients at greater risk for uncemented revision only up to 4.5 yr postoperatively (n = 1) (22) Younger patients at greater risk for revision at 8–15 yr postoperatively (n = 9) (16)^, (17)^, (19)^– (21)^, (23)^– (27)	Age ≥ 80 yr at greater risk for death in 30–60 d (n = 2) (28)^, (29) Increasing age is a predictor of death in 90 d − 1 yr (n = 1) (18) Rates increased at age > 70 yr (n = 1) (30)	Older age (> 70 yr) was associated with poorer function, except in WOMAC scores (n = 1) (31) Less improvement in function with increasing age (n = 1) (32)

Sex	+/−	+/+	+/+	+
	Men at greater risk (n = 8) (16)^, (17)^, (19)^– (24)^, (26) Sex not significant at 3 mo or 1 yr postoperatively (n = 1) (18)	Men younger than 80 yr had increased mortality rates 30–60 d postoperatively (n = 1) (29) Men older than 80 yr were at greatest risk of death in 30–60 d postoperatively (n = 1) (28) Men at increased risk of death in 90 d − 1 yr postoperatively (n = 3) (18)^, (30)^, (33)	Women had poorer function than men for all outcomes (n = 1) (31) Women showed less improvement in function than men (n = 1) (32)	Women experienced less postoperative pain than men (n = 1) (34)

Weight	Not evaluated	Not evaluated	+	Not evaluated
			BMI was negatively correlated with function (n = 1) (35)