From: Minimum 15-year results of metasul 28-mm metal-on-metal total hip arthroplasty in patients younger than 50 years of age
DeLee and Chanley zones - acetabular osteolysis
Number of hips
 Zone 2
2 hips
 Zone 3
3 hips
 Zones 1 and 2
1 hip
Gruen zones - femoral osteolysis
 Zone 1
4 hips
 Zone 7
 Zones 1 and 7