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Updated: Apr 18, 2026
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Half-segmental Diaphyseal Bone Defect Model in Rats for Evaluating Bone Substitute Performance in Load-bearing Regions
Published on: December 30, 2025
274
Densitometric evaluation of periprosthetic bone remodeling
Paolo Domenico Parchi1, Valentina Cervi1, Nicola Piolanti1
11st Orthopedic Division, Department of Translational Research and New Technology in Medicine and Surgery, University of Pisa, Pisa, Italy.
Summary
Dual-energy X-ray absorptiometry (DEXA) helps analyze bone changes after hip and knee replacements. Implant design and fixation influence bone remodeling, with stress shielding a common issue post-surgery.
Area of Science:
- Orthopaedic Surgery
- Biomedical Engineering
- Radiology
Background:
- Dual-energy X-ray absorptiometry (DEXA) is increasingly used in orthopaedics beyond osteoporosis.
- Its application now extends to evaluating bone-implant interactions.
Purpose of the Study:
- To review periprosthetic bone changes following total hip arthroplasty (THA) and total knee arthroplasty (TKA).
- To analyze the impact of implant design and fixation on bone remodeling.
Main Methods:
- Review of literature on DEXA applications in THA and TKA.
- Analysis of bone remodeling patterns and stress shielding.
Main Results:
- In THA, cementless femoral stem design and fixation location significantly affect bone remodeling.
- Short stems with metaphyseal fixation promote more physiological load transfer and reduce bone loss.
- In TKA, femoral bone loss is linked to implant-induced stress shielding, while tibial remodeling relates to knee alignment and load transfer.
Conclusions:
- Stress shielding is an inevitable phenomenon after THA and TKA, primarily occurring within the first year.
- Implant design and surgical technique play crucial roles in mitigating periprosthetic bone loss.
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