Mid-term survival of the Optimys short stem: A prospective case series of 500 patients

Table 1 Demographic characteristics, n = 500

Characteristic	Value
Male sex1	202 (40)
Age	62.3 (10.5)
Right side1	286 (57.0)
Height in cm	173.2 (9.2)
Weight in kg	79.9 (15.8)
BMI in kg/m2	26.5 (4.1)

¹n (%) or mean (standard deviation). BMI: Body mass index.

Table 2 Hip Disability and Osteoarthritis Outcome Score and 36-item short form survey baseline and follow-up scores

Outcome		Baseline, n = 471	6 wk, n = 388	3 months, n = 371	6 months, n = 355	1 yr, n = 317	2 yr, n = 233
HOOS
	Symptoms	42.1 (18.1)	71.6 (18.2)	76.3 (17.9)	81.1 (17.7)	85.9 (16.2)	85.9 (16.7)
	Pain	42.5 (16.5)	77.4 (16.7)	83.7 (16.6)	87.1 (15.8)	89.6 (15.0)	90.2 (14.7)
	ADL	42.6 (17.5)	74.7 (17.8)	81.0 (17.8)	85.4 (16.1)	88.6 (16.4)	89.5 (15.4)
	Sports and recreation	24.3 (19.6)	51.9 (26.8)	65.6 (25.1)	71.2 (24.9)	77.1 (24.2)	77.0 (24.9)
	Quality of life	25.9 (15.7)	54.6 (20.4)	66.9 (22.3)	72.8 (21.8)	78.4 (21.6)	80.0 (21.0)
SF 36
	Physical functioning	35.6 (18.6)	57.8 (22.8)	69.6 (22.4)	74.5 (22.4)	78.7 (22.4)	81.8 (19.8)
	Role physical	23.3 (35.7)	29.5 (36.0)	57.5 (42.5)	71.0 (40.4)	81.0 (34.9)	80.8 (34.4)
	Bodily pain	35.7 (17.2)	55.9 (22.1)	70.7 (22.1)	75.9 (21.2)	80.6 (22.4)	80.8 (22.8)
	Social functioning	61.0 (26.0)	68.1 (26.0)	79.9 (23.8)	85.0 (21.0)	88.5 (19.3)	87.7 (20.4)
	Mental health	73.4 (17.8)	80.2 (16.2)	82.0 (16.3)	81.8 (15.7)	83.1 (15.0)	83.0 (14.3)
	Role emotional	63.3 (43.7)	67.5 (41.5)	77.2 (38.2)	84.1 (33.6)	89.6 (27.0)	90.0 (27.2)
	Vitality	57.3 (19.9)	66.0 (18.4)	69.5 (18.4)	70.8 (18.2)	72.9 (17.4)	73.9 (16.7)
	General health perceptions	66.6 (18.5)	73.5 (17.9)	72.4 (19.0)	70.4 (19.7)	72.0 (19.9)	73.4 (18.5)

Data are mean (standard deviation). ADL: Activities of daily living; HOOS: Hip Disability and Osteoarthritis Outcome Score, SF-36: 36-item Short Form Survey.

Table 3 Yearly change in the patient-reported outcome measures (β) during the 1^st and 2^nd postoperative years

Outcome measure		1st yr		2nd yr
		β (95%CI)1	P value	β (95%CI)1	P value
HOOS
	Symptoms	34.8 (31.9, 37.6)	< 0.001	0.7 (-0.9, 2.3)	0.38
	Pain	36.8 (34.0, 39.7)	< 0.001	0.3 (-1.0, 1.6)	0.63
	ADL	36.2 (33.3, 39.1)	< 0.001	0.9 (-0.6, 2.5)	0.24
	Sports and recreation	43.3 (39.7, 46.9)	< 0.001	-0.1 (-2.6, 2.4)	0.93
	Quality of life	41.8 (38.7, 45.0)	< 0.001	1.5 (-0.7, 3.8)	0.18
SF-36
	Physical functioning	34.5 (31.4, 37.7)	< 0.001	0.8 (-1.7, 3.4)	0.56
	Role physical	54.4 (49.0, 59.7)	< 0.001	-1.2 (-6.2, 3.8)	0.64
	Bodily pain	36.5 (33.4, 39.6)	< 0.001	-0.4 (-3.3, 2.6)	0.80
	Social functioning	22.8 (19.5, 26.0)	< 0.001	-0.9 (-3.5, 1.7)	0.49
	Mental health	6.1 (4.1, 8.1)	< 0.001	-0.7 (-2.4, 1.1)	0.45
	Role emotional	23.3 (18.1, 28.5)	< 0.001	0.0 (-4.4, 4.5)	1.00
	Vitality	10.8 (8.5, 13.1)	< 0.001	-0.6 (-2.6, 1.4)	0.56
	General health perceptions	2.4 (0.3, 4.6)	0.03	0.1 (-1.7, 1.8)	0.95

¹Mixed model analysis. ADL: Activities in daily living; CI: Confidence interval; HOOS: Hip Disability and Osteoarthritis Outcome Score; SF-36: 36-item short form survey.