Collared versus collarless hydroxyapatite-coated stems for primary cementless total hip arthroplasty; a systematic review of comparative studies. Is there any difference in survival, functional, and radiographic outcomes?

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Table 1

Demographics and other study characteristics of studies included in the meta-analysis.

Authors	Year	Country	Study type	Level of evidence	Patients	Stems	Sex (female/male)	Mean Age at THA (years) [range]	BMI (kg/m²) [range]	Mean follow-up (months) [range]
Dammerer et al. [17]	2022	Austria	RCS	III	105	109	60/45	67.8 [21.6–90.5]	26.8 [17.4–50.8]	25.1 [8–57]
Polus et al. [11]	2022	Canada	RCT	I	79	79	36/43	65.2 [41–85]	28.4 [17.3–38.9]	12
Belgaïd et al. [19]	2022	France	RCS	IV	128	128	89/39	83 [80–93]	26.2 [16.9–38.2]	96 [60–120]
Wirries et al. [18]	2021	Germany	RCS	III	186	186	115/71	68.4 [34.2–89.5]	27.3 [18.6–44.3]	12
Melbye et al. [8]	2021	Norway	RCS	III	43,318	51,212	26,844^/15,923^	65 [54–76]^*	/	92.4 [12–360]
Karayiannis et al. [20]	2021	UK	RCS	III	288	288	167/121	70 [49–83]	/	130 [120–140]
Perelgut et al. [12]	2020	Canada	RCT	I	58	58	20/29	64.6 [56.5–72.7]	29.2 [24.4–33.1]	13
Magill et al. [21]	2019	UK	RCS	III	636	636	351/285	63.5 [58–68]	/	72 [62.4–81.6]
Hoskins et al. [22]	2019	Australia	RCS	III	41,265	41,265	/	/	/	/
Louboutin et al. [23]	2017	France	RCS	IV	133	140	55/85	69 [35–92]	27 [16–39]	120 [36–144]
Magill et al. [24]	2016	UK	RCS	III	4309	4802	2716/2086	70 [62–76]	/	72 [12–127]
Al-Najjim et al. [25]	2016	UK	RCS	III	121	121	66/51	67.1 [38–88]	28 [22–31]	12

THA: Total Hip Arthroplasty, UK: United Kingdom, BMI: Body Mass Index, kg: kilogram, m: meter, RCS: retrospective comparative study, RCT: randomized controlled trial.

Data from 2008 to 2018.

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