Table 2.

Planning accuracy and deviation of implants in absolute values and percentage

	Cup size		Stem size
	Occurrence	Percentage	Occurrence	Percentage
Implant size in general
Exact match	315	51	320	52
± 1 size	208	34	256	38
± 2 sizes	66	11	35	7
± 3 sizes or more	31	5	9	3
Implant size Stryker
Exact match	267	49	288	53
± 1 size	187	35	202	38
± 2 sizes	60	11	35	7
± 3 sizes or more	30	5	15	3
Implant size DePuy Synthes
Exact match	48	63	32	42
± 1 size	21	28	33	43
± 2 sizes	6	8	10	13
± 3 sizes or more	1	1	1	1

	Accurate acetabular planning		Accurate femoral planning
Planner’s experience
EndoCert-certified surgeon	150	90	150	90
Non-EndoCert-certified surgeon	79	85	80	86
Sex
Female	264	83	295	94
Male	259	86	260	86
Preoperative diagnosis
Primary osteoarthritis	448	84	475	89
Protrusion osteoarthritis	11	92	12	100
Femoral head necrosis	50	93	50	93
Hip dysplasia	14	74	18	90

Deviation of one size is considered to be accurate