We prospectively studied 250 patients with a proximal hydroxyapatite coated
hip prosthesis. The follow-up period was 5 years. All components showed os
seointegration except for one deep infection. The morphology of bone remode
ling with either endosteal bone formation or periosteal bone formation was
dependent on the way the stem filled the medullary canal. No linear or dist
al osteolysis around the stems was observed.