Poor outcome of revised resurfacing hip arthroplasty

Figures & data

Table 1.  Revision rates for primary resurfacing hip arthroplasty

Head component	Acetabular component	No. revised	Total no.	Obs. years	Revisions per 100 obs. years (95% CI)
ASR	ASR	64	1,073	2,814	2.3 (1.8–2.9)
Adept	Adept	4	292	525	0.8 (0.2–2.0)
BHR	BHR	269	8,427	34,340	0.8 (0.7–0.9)
Bionik	Bionik	5	119	181	2.8 (0.9–6.5)
Conserve	Conserve Plus	0	10	25	0.0 (0.0–15)
Conserve Plus	Conserve Plus	5	62	249	2.0 (0.7–4.7)
Cormet	Cormet	14	192	915	1.5 (0.8–2.6)
Cormet 2000 HAP	Cormet	10	95	460	2.2 (1.0–4.0)
Cormet HAP BiCoat	Cormet	10	287	534	1.9 (0.9–3.4)
Durom	Durom	37	767	2,223	1.7 (1.2–2.3)
Icon	Icon	2	96	196	1.0 (0.1–3.7)
Mitch TRH	Mitch TRH	7	534	627	1.1 (0.5–2.3)
Recap	Recap	8	137	255	3.1 (1.4–6.2)
Total		435	12,091	43,344	1.0 (0.9–1.1)

Note: 2 resurfacing hip procedures using only a Conserve resurfacing head and no acetabular component have not been included in this table.

Table 2.  Revision diagnosis for primary resurfacing hip arthroplasty by type of revision (excluding infection from revision of primary)

Revision diagnosis	Acetabular only	Femoral only		Acetabular and femoral		Total
	n	n	%	n	%	n	%
Fracture	–	164	66	8	7	172	43
Loosening/lysis	25	52	21	51	45	128	32
Metal sensitivity	1	–	–	27	24	28	7
Pain	1	13	5	9	8	23	6
Avascular necrosis	–	10	4	5	4	15	4
Dislocation of prosthesis	2	4	2	8	7	14	4
Other	7	4	2	6	5	17	4
Total	36	247	100	114	100	397	100

Table 3.  Revision rates for revised primary resurfacing hip arthroplasty, by type of revision (excluding infection from revision of primary)

Revised primary resurfacing hip	No. revised	Total no.	Obs. years	Revisions per 100 obs. years (95% CI)
Acetabular only	6	36	123	5.0 (1.8–11)
Femoral only	13	247	735	1.8 (0.9–3.0)
Acetabular and femoral	5	114	219	2.3 (0.7–5.0)
Total	24	397	1078	2.2 (1.4–3.3)

Table 4.  Re-revision diagnosis for revised primary resurfacing hip arthroplasty, by type of revision (excluding infection from revision of primary)

Re-revision diagnosis	Acetabular only (36)	Femoral only (247)	Acetabular and femoral (114)	Total (397)
	n	n	n	n
Loosening/lysis	3	6	–	9
Infection	1	4	1	6
Dislocation of prosthesis	2	1	1	4
Fracture	–	2	1	3
Other	–	–	2	2
Total	6	13	5	24

Note: numbers in parentheses refer to the number of revisions of the primary resurfacing procedure for that type of revision.

Figure 1.  Cumulative percent revision of revised primary resurfacing hip arthroplasty, by type of revision (excluding infection from revision of primary).

Figure 2.  Cumulative percent revision of primary conventional total hip arthroplasty and femoral-only revision of primary resurfacing hip arthroplasty (excluding primary diagnosis of fractured neck of femur and also excluding infection from revision of primary).