Head size
Issues
Wear
Stability
Normal feel of hip
Increased ROM
Wear
Large head
- increase volumetric wear
- less penetrative / linear wear
Small head
- increased linear wear
- decreased volumetric wear
Wear
Stability
Normal feel of hip
Increased ROM
Large head
- increase volumetric wear
- less penetrative / linear wear
Small head
- increased linear wear
- decreased volumetric wear
2-3% of cases
- doubles with infrequent operator
- second most common reason for revision after loosening
Australian Joint Registry
- dislocation accounts for 14.8% of revisions
Posterior dislocation
- hip flexed, adducted, IR