- Mayo definition, ≥62 mm in women and ≥66 mm in men
- Bone deficiencies are mostly filled by the cup itself
- Reduction of the need for bone-grafting
- Possible normalization of the hip center of rotation
- Disadvantages : May ream away posterior wall, column, Screws required, May raise hip centre of rotation, High rate of dislocation
- Contraindicated in Pelvic discontinuity, Unstable cup, Unable to get screw fixation,Host bone contact < 50%
- Survivorship free from revision of the metal acetabular component for any reason decreased from 93% at eight years to 83% at twenty years
- Rate of dislocation 10 to 12%
