Document Detail

The reinforcement of cancellous bone screws with calcium phosphate cement.
MedLine Citation:
PMID:  8926550     Owner:  NLM     Status:  MEDLINE    
The ability of calcium phosphate cement (CPC) to reinforce cancellous screws placed in previously stripped holes was studied in vitro. The distal end of canine femurs were harvested. A total of 15 screws were placed in six femurs. The pullout strength (failure force), failure displacement, stiffness, and energy absorbed were determined for the screws in the intact cancellous bone. Next, these stripped screw holes were packed with CPC. The pullout test was repeated, and the results were compared using a paired, Student's t test. We found that the CPC was able to reinforce the previously stripped holes and significantly increase the pullout strength (1,159 +/- 278 N versus 678 +/- 297 N) and the stiffness (1,990 +/- 569 N/mm versus 1,519 +/- 609 N/mm) of the constructs, as well as the energy absorbed by the constructs until failure (467 +/- 180 versus 278 +/- 140 There was no difference in the failure displacement (0.94 +/- 0.23 versus 0.85 +/- 0.51 mm). This study documents the ability of CPC to acutely reinforce cancellous bone screws in a region with no or poor-quality cancellous bone.
L E Mermelstein; L C Chow; C Friedman; J J Crisco
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of orthopaedic trauma     Volume:  10     ISSN:  0890-5339     ISO Abbreviation:  J Orthop Trauma     Publication Date:  1996  
Date Detail:
Created Date:  1996-10-25     Completed Date:  1996-10-25     Revised Date:  2013-04-05    
Medline Journal Info:
Nlm Unique ID:  8807705     Medline TA:  J Orthop Trauma     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  15-20     Citation Subset:  IM    
Department of Orthopaedic Surgery and Rehabilitation, Yale University School of Medicine, New Haven, Connecticut, USA.
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MeSH Terms
Bone Cements / therapeutic use*
Bone Screws*
Calcium Phosphates / therapeutic use*
Drug Evaluation, Preclinical
Equipment Failure
Femoral Fractures / surgery*
Materials Testing
Reg. No./Substance:
0/Bone Cements; 0/Calcium Phosphates; 0/alpha-tricalcium phosphate; 0/monocalcium phosphate; 0/tetracalcium phosphate; 97Z1WI3NDX/calcium phosphate; L11K75P92J/dicalcium phosphate anhydrous

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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