The Danish Hip Arthroscopy Registry: Registration Completeness and Patient Characteristics Between Responders and Non-Responders

Figures & data

Table 1 Completeness of Registrations in DHAR vs DNPR, 2012–2018

	2012	2013	2014	2015	2016	2017	2018
Number of hip arthroscopies registered in DHAR	398*	643	947	885	803	757	504**
Number of hip arthroscopies registered in DNPR	517*	738	1059	940	860	880	594**
Completeness (DHAR/DNPR) %	77.0	87.1	89.4	94.1	93.4	86.0	84.9
(95% confidence interval)	(73.4–80.6)	(84.7–89.5)	(87.6–91.2)	(92.5–95.6)	(91.7–95.1)	(83.7–88.3)	(82.0–87.8)

Notes: *From February 1st 2012 when registration in DHAR commenced, **until September 1st 2018.

Abbreviations: DHAR, the Danish hip arthroscopy registry; DNPR, the Danish national patient registry.

Table 2 Characteristics of Patients Registered in DHAR and DNPR, 2012–2018

	2012	2013	2014	2015	2016	2017	2018
Age at surgery
Hip registry, DHAR (mean, SD)	33.9 (12.5)	34.7 (12.8)	36.0 (12.5)	37.3 (12.6)	38.8 (12.5)	38.8 (12.1)	39.8 (12.2)
National registry, DNPR (mean, SD)	38.3 (12.6)	37.1 (12.5)	37.0 (12.5)	37,2 (12.5)	37.0 (12.4)	37.4 (12.7)	37.1 (12.4)
Sex, females
Hip registry, DHAR, n (%)	234 (59)	385 (60)	542 (57)	496 (56)	446 (55)	446 (59)	284 (56)
National registry, DNPR, n (%)	302 (58)	378 (51)	594 (56)	526 (56)	501 (58)	504 (57)	536 (59)

Abbreviations: SD, standard deviation; DHAR, the Danish hip arthroscopy registry; DNPR, the Danish national patient registry; n, numbers.

Table 3 Percentage of Patients Reporting Baseline Outcome Measures Compared to Total Number of Patients Registered in DHAR

	2012	2013	2014	2015	2016	2017	2018
Number of patients reporting in DHAR	224	429	534	570	481	605	451
Number of surgeries registered in DHAR	398	643	947	885	804	757	504
Completeness PROM/DHAR %	56.3	66.7	56.4	64.6	59.8	79.9	89.5
(95% CI)	(51.4–61.2)	(63.1–70.3)	(51.9–60.9)	(61.4–67.8)	(56.4–63.2)	(77.0–82.8)	(86.8–92.2)

Abbreviations: DHAR, the Danish hip arthroscopy registry; PROM, patient-reported outcome measure; CI, confidence interval.

Table 4 Baseline Patient-Reported Outcomes

	Numbers (%) or Mean (SD)
Level of physical activity prior to surgery
Sedentary	1363 (41)
Recreational	1666 (50)
Competitive	203 (6)
Elite	110 (3)
General hip status (0 = worst, 100 = best)	58.6 (19.0)
Hip pain intensity at rest (0 = best, 100 = worst)	40.0 (25.3)
Hip pain intensity after 15 min. walking (0 = best, 100 = worst)	51.0 (27.3)
The Copenhagen hip and groin outcome score
Pain	48.4 (21.8)
Symptoms	46.6 (20.4)
Activities of daily living	49.9 (26.0)
Sports and recreation	33.3 (24.3)
Physical activity	20.1 (24.9)
Hip-related quality of life	28.2 (17.6)
EQ-5D-3L	0.652 (0.188)

Abbreviation: EQ-5D-3L, European health-related quality of life questionnaire using five dimensions and recording three levels of severity.

Table 5 Baseline Differences Between Responders and Non-Responders at 1-Year Follow-Up

	Responders Numbers (%)	Non-Responders Numbers (%)	Difference Between Groups (p value)	Difference Between Groups (95% CI)
Age
<25	520 (18)	495 (24)	< 0.001
25–39	954 (33)	693 (34)
≥40	1412 (49)	875 (42)
Sex
Females	1707 (59)	1131 (55)
Males	1179 (41)	933 (45)	0.002
Activity levels prior to surgery
Sedentary	775 (41)	588 (40)
Recreational	946 (50)	720 (50)
Competitive	106 (5)	97 (7)
Competitive, elite	70 (4)	40 (3)	0.280
	Mean (SD)	Mean (SD)
General hip status	59.2 (19.0)	58.2 (19.1)	0.170	−0.391–2.220
HAGOS
Pain	47.7 (21.8)	48.9 (21.8)	0.120	−2.648–0.306
Symptoms	46.0 (20.4)	47.1 (20.3)	0.111	−2.507–0.258
ADL	49.2 (25.8)	50.4 (26.0)	0.120	−2.999–0.517
Sports and recreation	33.2 (24.1)	33.2 (24.4)	0.991	−1.654–1.635
Physical activity	20.9 (25.7)	19.5 (24.2)	0.105	−0.293–3.080
Hip-related QoL	28.7 (17.9)	27.5 (17.3)	0.063	−2.323–0.063
EQ-5D-3L	0.655 (0.185)	0.648 (0.192)	0.286	−0.020–0.006
Hospitals by geographical region	Numbers (%)	Numbers (%)
North Jutland	238 (8)	150 (7)
Mid Jutland	1152 (40)	863 (42)
Southern Denmark	393 (14)	290 (14)
Capitol Region	1103 (38)	761 (37)	0.351

Notes: Proportional differences for categorical data analyzed using chi-squared test and for numerical data, Student’s t-test (including 95% confidence intervals) is applied.

Abbreviations: CI, confidence interval; HAGOS, The Copenhagen Hip and Groin Outcome Score; ADL, activities of daily living; QoL, quality of life; EQ-5D-3L, European health-related quality of life questionnaire using five dimensions and recording three levels of severity.