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 2

Operative and implant characteristics of the included studies in the meta-analysis.

Authors	Stem type		Stem offset						Cup	Approach				Preoperative diagnosis
Authors	Collared stems	Collarless stems	KHO, high offset without collar	KS, standard offset without collar	Coxa vara with collar	KA, standard offset with collar	KLA, high offset with collar	Other, NR	Cup	A	P	ARL	Other, NR	OA	AVN	Dysplasia
Dammerer et al. [17]	85	24	13	11	7	32	40	6	Pinnacle	107	2	0	0	104	4	1
Polus et al. [11]	36	43	0	43	0	36	0	0	Pinnacle	49	0	30	0	79	0	0
Belgaïd et al. [19]	117	11	11	0	0	98	19	0	Sunfit	0	128	0	0	121	1	2
Wirries et al. [18]	146	40	/	/	/	/	/	186	Pinnacle	94	0	92	0	186	0	0
Melbye et al. [8]	17,275	33,937	5009	28,928	6924	10,351	0	0	/	10,725^*	16,546 ^*	13,732^*	1,764^*	20,391^*	/	/
Karayiannis et al. [20]	99	189	100	89	0	99	0	0	Pinnacle	0	288	0	0	/	/	/
Perelgut et al. [12]	19	22	0	22	0	19	0	0	Pinnacle	58	0	0	0	58	0	0
Magill et al. [21]	318	318	159	159	0	161	157	0	Pinnacle	0	636	0	0	/	/	/
Hoskins et al. [22]	18,936	22,310	/	/	/	/	/	41,246	/	/	/	/	41,265	41,265	0	0
Louboutin et al. [23]	28	112	0	112	0	28	0	0	Allofit, Lagoon	0	140	0	0	132	4	4
Magill et al. [24]	3316	1482	856	626	/	2507	809	/	Pinnacle	0	4802	0	0	/	/	/
Al-Najjim et al. [25]	66	55	/	/	/	/	/	121	Pinnacle	/	/	/	/	/	/	/
Total	40,441	58,543	6148	29,990	6931	13,331	1025	41,559	/	11,033	22,542	13,854	1764	62,336	9	7

NR: not reported, A: Anterior, P: Posterior, ALR: Antero-lateral, OA: Osteo-arthritis, AVN: Avascular necrosis, KHO: high offset stem without collar, KS, standard offset stem without collar, KA: standard offset stem with collar, KLA: high offset stem with collar.

Data from 2008 to 2018.

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