Patient-reported outcomes in hip resurfacing versus conventional total hip arthroplasty: a register-based matched cohort study of 726 patients

Figures & data

Table 1. Patient demographics

Characteristics	Case group	Control group	p-value
Number of patients	363 (	363 (
Women, n (%)	90 (25)	86 (24)	0.8
Age at primary
operation, mean (SD)	52 (8.8)	51 (8.7)	0.7
Year of surgery, mean (SD)	2008 (2.9)	2008 (2.9)	0.9
Follow-up time, mean (SD)	7.3 (2.9)	7.3 (3.0)	0.9
Distribution of diagnoses, n (%)			0.7
Primary osteoarthritis	315 (87)	325 (90)
Childhood hip disease	41 (11)	31 (8.5)
Other hip joint disorders	7 (2.0)	7 (2.0)
PROMs preoperatively, n	206 (	363 (
VAS hip pain, mean (SD)	74 (16.4)	69 (18.4)	0.002
EQ-5D index, mean (SD)	0.52 (0.29)	0.43 (0.32)	0.001
Patients reoperated, n (%)	13 (3.6)	16 (4.4)	0.6

SD = standard deviation; PROMs = patient-reported outcome measures; VAS = visual analog scale; EQ-5D = EuroQol 5 dimensions.

Table 2. Non-respondent analysis

Characteristics	Respondents	Non-respondents	p-value
Number of ptients	569 (	157 (
Women, n (%)	132 (23)	44 (28)	0.3
Cases, n (%)	299 (53)	64 (41)	0.01
Age at primary
operation, mean (SD)	52 (8.6)	49 (9.0)	0.001
Year of surgery, mean (SD)	2008 (2.9)	2008 (2.8)	0.8
Distribution of diagnoses, n (%)			0.1
Primary osteoarthritis	508 (89)	132 (84)
Childhood hip disease	49 (8.6)	23 (15)
Other hip joint disorders	12 (2.1)	2 (1.3)
PROMs preoperative
VAS hip pain, mean (SD)	70 (18)	72 (19)	0.3
EQ-5D index, mean (SD)	0.49 (0.31)	0.40 (0.32)	0.006

SD = standard deviation; VAS = visual analog scale; EQ-5D = EuroQol 5 dimensions.

Table 3. Postoperative functional outcomes. Values are mean (SD)

Variables	Case group	Control group	p-value
HOOS index (%)
Symptoms	85 (17)	83 (19)	0.09
Pain	90 (15)	87 (18)	0.01
ADL	90 (15)	84 (19)	< 0.001
Sport/Rec	77 (24)	68 (29)	< 0.001
QoL	77 (21)	74 (22)	0.07
EQ-5D index	0.90 (0.17)	0.87 (0.21)	0.2
VAS hip pain	11 (16)	12 (18)	0.4
VAS satisfaction	13 (20)	12 (21)	0.7

SD = standard deviation; HOOS = Hip Disability and Osteoarthritis Outcome Score; ADL = Activity in Daily Living; Sport/Rec = Sport and Recreation; QoL = Quality of Life; EQ-5D = EuroQol 5 dimensions; VAS = Visual analog scale.

Figure 2. Graphic representation of postoperative PROMs after multivariable linear regression analyses. Bars represent 95% CI of the adjusted estimates (regression coefficients). For abbreviations, see Table 3.