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Published in: BMC Musculoskeletal Disorders 1/2015

Open Access 01-12-2015 | Research article

Bone mineral density after implantation of a femoral neck hip prosthesis – a prospective 5 year follow-up

Authors: Wolfram Steens, Friedrich Boettner, Rainer Bader, Ralf Skripitz, Alberto Schneeberger

Published in: BMC Musculoskeletal Disorders | Issue 1/2015

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Abstract

Background

Bone resorption in the proximal femur due to stress shielding has been observed in a number of conventional cementless implants used in total hip arthroplasty. Short femoral-neck implants are claiming less interference with the biomechanics of the proximal femur. The goal of this study was to prospectively investigate the in vivo changes of bone-mineral density as a parameter of bone remodeling around a short, femoral neck prosthesis over the first 5 years following implantation. The secondary goal was to report on its clinical outcome.

Methods

We are reporting on the changes of bone mineral density of the proximal femur and the clinical outcome up to five years after implantation of a short femoral neck prosthesis. Bone mineral density was determined using dual energy x-ray absorptiometry, performed 10 days, three, 12 and 60 months after surgery. 20 patients with a mean age of 47 years (range 17 to 65) were clinically assessed using the Harris Hip Score. The WOMAC was used as a patient-relevant outcome-measure.

Results

In contrast to conventional implants DEXA-scans overall revealed a slight increase of bone mineral density in the proximal femur in the 12 months following the implantation. The Harris Hip Score improved from an average preoperative score of 46 to a postoperative score at 12 months of 91 points and 95 points at 60 months, the global WOMAC index from 5.3 preoperatively to 0.8 at 12 months and 0.6 at 60 months postoperatively.

Conclusion

At 60 months after implantation of a short femoral neck prosthesis, all regions except one (region of interest #5) showed no significant changes in BMD compared to baseline measurements at 10 days which is less to the changes in bone mineral density seen in conventional implants.
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Metadata
Title
Bone mineral density after implantation of a femoral neck hip prosthesis – a prospective 5 year follow-up
Authors
Wolfram Steens
Friedrich Boettner
Rainer Bader
Ralf Skripitz
Alberto Schneeberger
Publication date
01-12-2015
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2015
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/s12891-015-0624-0

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