From: Hemiarthroplasties in young patients with osteonecrosis or a tumour of the proximal femur; an observational cohort study
Hemiarthroplasty
N(implants)
Unipolar
Bipolar
Implant
In situ
36
2
34
Conversion/Revision
5/1
2/0
3/1
Acetabular erosion
Grade 0
27
1
26
Grade 1
13
3
10
Grade 2
0
Grade 3
Total
42
4
38