Patients with hip resurfacing arthroplasty are not physically more active than those with a stemmed total hip

Figures & data

Number of patients enrolled and analyzed in this study. ^aOne patient underwent revision surgery, but died 6 months later due to a non-surgical reason. 1 patient underwent revision surgery and a primary arthroplasty contralaterally a few years after.

Table 1. Baseline characteristics. Values are median (range) unless otherwise specified

Factor	HRA group	Stemmed THA group	p-value
Male sex, n	12	12	1.0
Age at surgery	56 (43–67)	60 (53–68)	0.1
Follow-up (years)	10 (9–11)	10 (8–12)	0.4
BMI	26 (22–37)	29 (20–40)	0.1
Approach, n			1.0
Posterolateral	7	7
Straight lateral	9	9
Bearing, n
MoM	16	–	–
MoP	–	4	–
CoP	–	12	–

MoM = metal-on-metal, MoP = metal-on-polyethylene,

CoP = ceramic-on-polyethylene.

Table 2. Parameters of physical activity monitoring. Values are median (range)

Factor	HRA group	Stemmed THA group	p-value
AM wearing time (h)	12 (11–16)	14 (11–16)	0.1
Time sitting (h)	7.6 (4.6–12)	9.6 (3.8–13)	0.1
Time standing (h)	3.0 (1.8–5.7)	3.0 (1.6–6.2)	0.9
Time walked (h)	1.3 (0.5–1.9)	1.1 (0.4–1.8)	0.6
Time cycled (h)	0.05 (0.0–0.48)	0.01 (0.0–1.2)	0.5
Steps taken (nЧ10^3)	5.5 (2.3–10)	4.6 (1.6–11)	0.6
Sit–stand transfers (n)	39 (21–74)	37 (24–65)	0.7
Cadence (steps/min)	102 (81–112)	98 (80–110)	0.3

Table 3. Patient reported outcome measures. Values are median (range)

Factor	HRA group	Stemmed THA group	p-value
HOOS-PS	87 (49–100)	67 (49–100)	0.3
FJS-12	63 (2–100)	56 (4–100)	0.5
SQUASH	6,150 (1,110–18,480)	4,560 (1,050–9,300)	0.2