Related Experiment Videos
Bone loss around 2 different types of hip prostheses
A J Spittlehouse1, T W Smith, R Eastell
1Bone and Joint Research Unit, Nether Edge Hospital, Sheffield, United Kingdom.
The Journal of Arthroplasty
|June 30, 1998
Summary
Dual energy x-ray absorptiometry (DXA) precisely measures bone density around hip implants. Bone loss is rapid in the first six months after hip replacement surgery, with no significant difference between the two prosthesis types studied.
Area of Science:
- Orthopedic surgery
- Radiology
- Biomedical engineering
Background:
- Uncemented hip prostheses are common in total hip replacement.
- Monitoring periprosthetic bone mineral density (BMD) is crucial for assessing implant stability and predicting outcomes.
- Dual energy x-ray absorptiometry (DXA) is a non-invasive technique for BMD measurement.
Purpose of the Study:
- To assess the reproducibility of periprosthetic BMD measurements using DXA.
- To characterize the temporal pattern of bone loss following hip prosthesis implantation.
- To compare bone loss patterns around two distinct types of uncemented hip prostheses: Bateman and porous-coated anatomic.
Main Methods:
- A cohort of 20 patients undergoing hip replacement with either Bateman (n=11) or porous-coated anatomic (n=9) prostheses were recruited.
- Periprosthetic BMD was measured using DXA at baseline and at various follow-up intervals up to 52 weeks post-surgery.
- Statistical analysis was performed to determine reproducibility and compare bone loss between prosthesis types.
Main Results:
- DXA measurements of periprosthetic BMD demonstrated high reproducibility.
- A mean bone loss of 6% was observed between 6 and 52 weeks post-surgery.
- The most significant bone loss (18%) occurred in the proximal medial cortex, particularly within the first six months.
Conclusions:
- DXA is a precise and reliable method for quantifying periprosthetic bone mass around uncemented hip prostheses.
- Significant periprosthetic bone loss occurs rapidly in the initial six months after total hip replacement.
- No significant difference in the rate or extent of periprosthetic bone loss was found between the Bateman and porous-coated anatomic prostheses studied.