head size

Head size

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