Does the physical activity profile change in patients with hip dysplasia from before to 1 year after periacetabular osteotomy?

Figures & data

Figure 1. Flowchart of the study process among 100 consecutive patients with symptomatic hip dysplasia scheduled for periacetabular osteotomy (PAO).

Table 1. Baseline characteristics of 97 consecutive patients with hip dysplasia

Outcomes	Baseline
Men	15
Age, years (SD)	30 (9)
BMI, kg/m^2 (SD)	23 (3)
CE angle, degrees (SD)	17 (4.7)
AI angle, degrees (SD)	14 (4.8)
Tönnis osteoarthritis grade 1	3
Bilateral hip dysplasia	86
Hours spent on self-reported preferred
physical activities/week, n
<2.5	13
2.5 to <5	18
5 to <10	40
≥10	26
Self-reported preferred physical activities, n
Fitness	27
Running	19
Team sports	13
Gymnastics	6
Horseback riding	6
Bicycling	5
Dancing	3
Other	16
No one	2

Abbreviations: SD (standard deviation); BMI (body mass index), CE (center-edge), AI (Tönnis’ acetabular index).

Table 2. Accelerometer-based physical activity and self-reported physical activity in hip dysplasia (n = 77)

Outcomes	Baseline mean (SD)	1-year follow-up mean (SD)	Difference mean % points (CI)	Effect size	p-value
Percent of time measured by accelerometer-based sensors
Very low intensity	74 (9.1)	76 (8.9)	1.6 (–0.89 to 4.0)	0.14	0.2
Low intensity	14 (5.1)	14 (5.3)	–0.66 (–2.2 to 0.89)	–0.096	0.4
Moderate intensity	6.8 (2.9)	6.4 (2.6)	–0.40 (–1.1 to 0.31)	–0.13	0.3
High intensity	4.6 (2.0)	4.3 (2.0)	–0.32 (–0.77 to 0.13)	–0.16	0.2
Self-reported physical activity
HAGOS PA^a	23 (24)	45 (33)	22 (14 to 29)	0.67	<0.001
Hours in PA/week^b,^c	0.0 (0.0–2.3)	1.0 (0.0–3.0)	–	0.18	0.1

a HAGOS (Copenhagen Hip and Groin Outcome Score, 0–100 points),

b PA (preferred physical activity participation)

c Non-parametric data presented as median (interquartile range).

Table 3. General physical activity profile based on objective data on patients with hip dysplasia

Outcomes	Baseline (n = 97) median (CI)	1-year follow-up (n = 78) median (CI)
Cadence as steps/min	99 (98–100)	100 (98–102)
Events/day, n
Total steps	7,404 (6,645–8,418)	7,925 (6,637–8,612)
Steps (level)	6,923 (6,192–7,709)	7,322 (6,081–8,217)
Steps (up)	266 (194–403)	235 (171–313)
Steps (down)	155 (134–183)	146 (123–169)
Total wear time, h/day	14 (14–15)	15 (14–15)
Time as percentage
Resting	64 (61–68)	63 (59–66)
Standing	23 (22–27)	26 (23–27)
Walking	11 (9.9–13)	11 (9.3–13)
Cycling	0.15 (0.063–0.33)	0.084 (0.046–0.18)
Running	0.011 (0.0042–0.020)	0.0078 (0.0040–0.025)

Figure 2. Scatter plot of the prediction of change in accelerometer-based physical activity (PA) at high intensity as a linear function of change in self-reported preferred physical activity participation (PA) measured by the Copenhagen Hip and Groin Outcome Score (HAGOS) from baseline to 1 year post-surgery.