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 3

Postoperative complications of the patients in the included studies.

Authors	Complication	Collared (N, %)	Collarless (N, %)	Overall (N, %)	p-value
Dammerer et al. [17]	Any	0	0	0	–
Polus et al. [11]	Any	0	0	0	–
Wirries et al. [18]	Any	0	0	0	–
Belgaïd et al. [19]	Periprosthetic fracture	1 (0.8%)	1 (9%)	2 (1.6%)	n.s.
	Distal femoral fracture	1 (0.8%)	0	1 (0.8%)
	Infection	2 (1.6%)	0	2 (1.6%)
Melbye et al. [8]	Revision for any reason	183 (1.06%)	1010 (2.97%)	1193 (2.33%)	<0.001
	Revision for aseptic loosening	61 (0.35%)	163 (0.48%)	224 (0.44%)
	Revision for PFF	61 (0.35%)	214 (0.63%)	275 (0.54%)
Karayiannis et al. [20]	Any	0	0	0	–
Perelgut et al. [12]	Any	0	0	0	–
Magill et al. [21]	Any	0	0	0	–
Hoskins et al. [22]		n.a.	n.a.	n.a.	n.a.
Louboutin et al. [23]	PFF	0	2 (1.78%)	2 (1.4%)	n.a.
	Infection	1 (3.57%)	1 (0.9%)	2 (1.4%)
	Aseptic loosening	0	2 (1.78%)	2 (1.4%)
	Dislocation	n.a.	n.a.	6 (4.3%)
	Calcar fracture	n.a.	n.a.	5 (3.6%)
	Great trochanter fracture	n.a.	n.a.	2 (1.4%)
	Sciatic nerve palsy	n.a.	n.a.	2 (1.4%)
	Iliopsoas irritation	n.a.	n.a.	2 (1.4%)
	Ceramic liner fracture	n.a.	n.a.	1 (0.7%)
Magill et al. [24]	Instability			22 (0.46%)	n.a.
	Infection			20 (0.42%)
	Aseptic loosening stem	3 (0.09%)	12 (0.8%)	15 (0.31%)
	Femoral fracture	1 (0.03%)	5 (0.34%)	6 (0.12%)
	Metallosis			5 (0.10%)
	Failure of acetabular component	n.a.	n.a.	3 (0.06%)
	Liner dissociation			6 (0.12%)
	Acetabular fracture	n.a.	n.a.	1 (0.02%)
	Aseptic loosening cup	n.a.	n.a.	1 (0.02%)
	Leg length discrepancy	n.a.	n.a.	1 (0.02%)
Al-Najjim et al. [25]	Surgical site infection	4 (6%)	1 (1.8%)	5 (4.13%)	n.a.
	Cellulitis	1 (1.5%)	1 (1.5%)	2 (1.65%)
	Deep vein thrombosis	2 (3%)	2 (3.6%)	4 (3.31%)
	Cup revision	1 (1.5%)	1 (1.8%)	2 (1.65%)
	Stem revision	1 (1.5%)	1 (1.8%)	2 (1.65%)
	Iatrogenic fracture	1 (1.5%)	0	1 (0.83%)

N: Number, n.a.: not available, n.s.: not significant, PFF: periprosthetic fractures.

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