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European Journal of Orthopaedic Surgery & Traumatology

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01-07-2019 | Hip-TEP | Original Article • HIP - ARTHROPLASTY

Peri-prosthetic bone remodeling and change in bone mineral density in the femur after cemented polished tapered stem implantation

Authors: Toshiki Iwase, Daigo Morita, Genta Takemoto, Hiroshi Fujita, Naoyuki Katayama, Hiromi Otsuka

Published in: European Journal of Orthopaedic Surgery & Traumatology | Issue 5/2019

Abstract

Objective

We examined longitudinal changes in bone mineral density (BMD) around the femur for 5 years after total hip arthroplasty (THA) using cemented collarless polished double-tapered stem implantation and investigated the influence of BMD changes on radiological remodeling of the femur.

Materials and methods

Sixty hips from 56 patients who underwent cemented THA with a collarless polished double-tapered stem were included. BMD was measured 2 weeks postoperatively (baseline), 3 months, 6 months, 1 year and annually thereafter until 5 years after surgery using dual-energy X-ray absorptiometry on the lumbar spine and proximal femur of the operated side according to the Gruen’s zone classification. We analyzed predictable factors for BMD preservation in the proximal femur and compared radiological remodeling of the femur and changes in BMD.

Results

BMD at 5 years in zone 7 decreased less than 10%, whereas BMD in zone 1 increased to over the baseline (+ 1.9%). Multiple linear regression analyses revealed that body weight was a predictor for positive BMD change in the proximal femur. The frequency of radiolucency of the femur was significantly lower in patients who exhibited an increase in BMD at 5 years compared with BMD at 2 weeks in zone 7.

Conclusion

BMD preservation of the proximal femur after cemented collarless polished double-tapered stem implantation was more effective in heavier patients. Furthermore, the frequency of radiolucency around the stem was significantly lower in patients who exceeded 100% of the baseline BMD in zone 7 at 5 years.

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Title: Peri-prosthetic bone remodeling and change in bone mineral density in the femur after cemented polished tapered stem implantation
Authors: Toshiki Iwase
Daigo Morita
Genta Takemoto
Hiroshi Fujita
Naoyuki Katayama
Hiromi Otsuka
Publication date: 01-07-2019
Publisher: Springer Paris
Keywords: Hip-TEP
Hip-TEP
Published in: European Journal of Orthopaedic Surgery & Traumatology / Issue 5/2019
Print ISSN: 1633-8065
Electronic ISSN: 1432-1068
DOI: https://doi.org/10.1007/s00590-019-02414-6

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Peri-prosthetic bone remodeling and change in bone mineral density in the femur after cemented polished tapered stem implantation

Abstract

Objective

Materials and methods

Results

Conclusion

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

Objective

Materials and methods

Results

Conclusion

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