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Table 4 Metal-on-metal studies included in review.

From: The effectiveness of metal on metal hip resurfacing: a systematic review of the available evidence published before 2002

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
  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
  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
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Oswestry Outcome Centre Database [20] Oswestry Outcome Centre (Unpublished observational data) Oswestry Outcome Centre McMinn (1378 Hips)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
  1. a Median (range)
  2. b Charnley hip score
  3. c UCLA hip score
  4. d Results of groups reported together
  5. e Harris hip score
  6. f Data from 97 patients (110 hips);
  7. CIC – Data marked as "Commercial in confidence" in the industry report
  8. NR – Not Reported