The periprosthetic bone remodelling process--signs of vital bone reaction.

Bone remodelling in cementless hip stem replacement occurs as interface and periprosthetic bone remodelling. Results of radiological, histological and bone mineral density (BMD) findings are discussed. Atrophic, hypertrophic and normotrophic bone reactions are described. Osteodensitometry measurements have shown a bone density decrease of 20% within the first 6 months in the region of the proximal femur. Measurements up to 4 years revealed no further loss of BMD.