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Table 4 Failures for two study groups

From: Metal-on-metal hip resurfacing in patients younger than 50 years: a retrospective analysis

Type

Group 1

Group 2

p value

No. of cases

1285

1984

1) Acetabular failures

 Adverse wear

4 (0.3%)

7 (0.4%)

0.8415

 Loose acetabular component

6 (0.5%)

4 (0.2%)

0.1802

 Failure of acetabular ingrowth

10 (0.8%)

9 (0.5%)

0.2340

 Acetabular component shift

0 (0%)

1 (0.1%)

0.4237

2) Femoral failures

 Early femoral neck fracture

5 (0.4%)

15 (0.8%)

0.1902

 Loose femoral component

12 (1.0%)

9 (0.5%)

0.0930

 Femoral head collapse

2 (0.2%)

4 (0.2%)

0.7642

3) Other failures

 Unexplained pain

1 (0.1%)

3 (0.2%)

0.5552

 Late infection

2 (0.2%)

0 (0%)

0.0784

 Early infection

1 (0.1%)

1 (0.1%)

0.7566

 Late fracture

2 (0.2%)

1 (0.1%)

0.3320

 Recurrent instability

3 (0.2%)

0 (0%)

0.0316*

 Psoas tendonitis

1 (0.1%)

0 (0%)

0.2150

 Other failuresa

0 (0%)

4 (0.2%)

0.1074

Total failures

48 (3.7%)

58 (2.9%)

0.2005

  1. Statistically significant p values are italicized and denoted by an asterisk (*)
  2. aOther causes include diarrhea, UTI, urinary retention, squeaking implant, frostbite, and other uncommon causes not built into the database