No improvement in long-term wear and revision rates with the second-generation Biomet cup (RingLoc) in young patients

Figures & data

Table 1. Baseline characteristics of the 2 groups

	HexLoc	RingLoc
Total number of hips	64	77
Males/females	23/41	32/45
Mean age at surgery	41 (17–55)	42 (15–55)
Previous hip surgery	19	8
Mean preoperative HHS	43 (14–73)	43 (4–74)
Average BMI	24	24
Additional screw fixation	11	9
Deceased	5	6
Etiology
Rheumatoid arthritis	23	24
Ankylosing spondylitis	10	9
Femoral head necrosis	9	16
Primary osteoartritis	7	9
Hip dysplasia/luxation	6	8
Trauma	1	3
Other	8	8

Table 2. Survival estimates for the 2 groups (95% CI)

Survival (years)	HexLoc	At risk	RingLoc	At risk
5	100%	63	100%	69
10	89% (81–89)	55	92% (85–99)	41
12	77% (67–87)	47	86% (77–96)	15
16	49% (34–63)	16

Figure 1. Kaplan-Meier survival curve. Blue: HexLoc; green: RingLoc.

Figure 2. Radiolucencies around the acetabulum in the HexLoc group.

Figure 3. Radiolucencies around the acetabulum in the RingLoc group.