Examining the “revisability” benefit of hip resurfacing arthroplasty

Table 1 Demographic information of study and control groups

	Study group (n = 37)	Control group (n = 37)
Age (yr)	53.0	42.1
Male/female ratio (%)	47.2/55.5	33.0/67.0
BMI (kg/m2)	26.4	29.0
Indication for revision surgery, n (%)
Adverse local tissue reaction	16 (43)	-
Infection	2 (5)	-
Loose femoral component	6 (16)	-
Loose acetabular component	9 (24)	-
Femoral neck fracture	1 (3)	-
Other	3 (8)	-

BMI: Body mass index.

Table 2 Patient reported outcomes between study and control groups

	Study group	Control group	P value
Visual Analog Scale Pain Score	1.5 ± 1.6	-
Modified Harris Hip Score	81.7 ± 13.8	90.2 ± 11.6	< 0.01a
UCLA activity level	7.5 ± 2.3	7.2 ± 1.6	0.51
Short-form 12
Physical	51 ± 8.1	-
Mental	53 ± 10.8	-

^aP < 0.05.

UCLA: University of California Los Angeles.

Table 3 Patient reported outcomes between metal-related pathologies revision and non-metal-related pathologies revision compared to the control group

	Control	MRP (P value)	Non-MRP (P value)
Modified Harris Hip Score	90.2 ± 11.6	77.1 ± 14.5 (< 0.01a)	85.2 ± 11.5 (0.11)
UCLA activity level	7.2 ± 1.6	6.1 ± 2.3 (0.05)	8.5 ± 1.8 (< 0.01a)

^aP < 0.05.

MRP: Metal-related pathologies; UCLA: University of California Los Angeles.

Table 4 Patient reported outcomes for metal-related pathologies versus non-metal-related pathologies groups

	MRP	Non-MRP	P value
Visual Analog Scale Pain Score	1.7 ± 1.6	1.3 ± 1.7	0.22
Modified Harris Hip Score	77.1 ± 14.5	85.2 ± 11.5	0.04a
UCLA activity level	6.1 ± 2.3	8.5 ± 1.8	< 0.01a
Short-form 12
Physical	45.6 ± 8.9	55.2 ± 4.3	< 0.01a
Mental	50.1 ± 12.6	55.3 ± 8.7	0.07

^aP < 0.05.

MRP: Metal-related pathologies; UCLA: University of California Los Angeles.

Table 5 Patient reported outcomes between all cause conversion total hip arthroplasty, metal-related pathologies, and non-metal-related pathologies revision compared to revision total hip arthroplasty

Ref.	Patient reported outcome	Revision THA	Conversion THA (P value)	Non-MRP (P value)	MRP (P value)
Lübbeke et al[18], 2012	HHS	76.7 ± 18.1	81.7 ± 13.8 (0.12)	85.2 ± 11.5 (0.04a)	77.1 ± 14.5 (0.93)
	SF-12 PCS	36.5 ± 8.6	51.0 ± 8.1 (< 0.01a)	55.2 ± 4.3 (< 0.01a)	45.6 ± 8.9 (< 0.01a)
	SF-12 MCS	46.5 ± 11.2	53.0 ± 10.8 (< 0.01a)	55.3 ± 8.7 (< 0.01a)	50.1 ± 12.6 (0.23)
Postler et al[20], 2017	UCLA	4.1 ± 1.6	7.5 ± 2.3 (< 0.01a)	8.5 ± 1.8 (< 0.01a)	6.1 ± 2.3 (< 0.01a)

^aP < 0.05.

MRP: Metal-related pathologies; THA: Total hip arthroplasty; mHHS: Modified Harris Hip Score; HHS: Harris Hip Score; UCLA: University of California Los Angeles activity level; SF-12 PCS: Short-Form 12 Physical Component Score; SF-12 MCS: Short-Form 12 Mental Component Score.