Table 4.
Metal-on-metal studies included in review.
| Study (Study design) Funding source | Prostheses | Mean duration of follow up (range) | Mean patient age (range) | Revision Rate (unless otherwise stated) | Hip Score Pre-operation/Post-operation |
| Amstutz (2000) [9] Specialist orthopedic hospital, USA. (Observational) Not reported | Cemented, modified McMinn acetabular (7 Hips) Conserve Plus (29 Hips) |
22 months (NR) | 40 years (NR) | NR | NR |
| McMinn (1996) [10] 3 Birmingham Hospitals, UK. (Observational) Not reported | Uncemented, Uncoated (70 Hips) | 50.2 months (44–54)a | 48.7 years (NR) | 8/66 patients = 12.1% 60/66 = 90.9% patients pain free |
pain 3.1b/5.3 mobility 3.1b/5.3 walking 3.1b/5.3 |
| Uncemented, Hydroxyapetite coating (6 Hips) | 40.2 months (38–42)a | 0/6 patients = 0% | pain 3.0b/5.5 mobility 3.1b/6.0 walking 2.7b/5.7 |
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| Cemented acetabular (43 Hips) | 33.2 months (23–38)a | 4/39 patients = 10.3% | pain 2.9b/5.4 mobility 3.0b/5.4 walking 3.2b/5.4 |
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| Cemented acetabular, Hydroxyapetite coating (116 Hips) | 8.3 months (1–19)a | 0/109 patients = 0% | pain 3.0b/5.7 mobility 3.2b/5.7 walking 3.2b/5.7 |
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| Schmalzried (1996) [11] Specialist orthopedic hospital, USA. (Observational) Not reported | Cementless Wagner (4 Hips) Cemented McMinn (17 Hips) |
16 months (10–25) | 42 years (22–64)a | 1/19 patients = 5.3% | pain 4c/9 walking 6c/9 function 6c/9 activity 4cd/7 |
| Wagner (1996) [12] Specialist orthopedic hospital, Germany. (Observational) Not reported | 2 Ti pins on cupshell (12 Hips) Press fit version (23 Hips) |
20 months (6–54) | 36 years (15–64)a | 5/35 patients = 14.3% | 32 (5–51)e d/94 (72–100)ed |
| Corin Group Ltd, 2001 [18] 4 UK Hospitals, 1 UK clinic, 3 surgeons (Industry submission) Corin Group Ltd | Cormet 2000 | 21.36 monthsf | 50.8 years (26–69)f | Revision Rate CIC 69/97 = 71.1%f Patients pain free |
NR |
| Midland Medical Technologies Ltd, 2001 [19] Hospitals in Birmingham Southampton Liverpool and Belgium (Industry submission) Midland Medical Technologies Ltd | Birmingham Hip Resurfacing (1761 Patients) | NR | 49.2 years (15–86) | 8/1382 hips = 0.6% | NR |
| Wright Cremascoli Ortho Ltd, 2001 [21] (Industry submission) Wright Cremascoli | Conserve Plus (100 Hips) | NR (24–51.6) | NR | 3/100 hips = 3% | NR |
| Oswestry Outcome Centre Database [20] Oswestry Outcome Centre (Unpublished observational data) Oswestry Outcome Centre | McMinn (1378 Hips) All consultants (4424 Hips) |
0–4 years 0–4 years |
53.1 (NR) 49.2 (NR) |
7/1378 = 0.5% 34/4424 = 0.77% |
66.2e/98.1e 61.3e/95.9e |
a Median (range)
b Charnley hip score
c UCLA hip score
d Results of groups reported together
e Harris hip score
f Data from 97 patients (110 hips);
CIC – Data marked as "Commercial in confidence" in the industry report
NR – Not Reported