Document Detail

Effects of retrograde femoral intramedullary nailing on the patellofemoral articulation.
MedLine Citation:
PMID:  9892119     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To determine the patellofemoral contact areas as well as mean and maximal pressures after retrograde intramedullary nailing in a cadaveric model. STUDY DESIGN: Pressure-sensitive film was used to analyze patellofemoral joint pressures after insertion of a retrograde femoral nail in a cadaveric specimen. METHODS: A retrograde femoral nail was inserted into seven cadaveric knees. Pressure-sensitive film was placed into the patellofemoral joint and physiologic loads (700 newtons) were applied to the knee joint at 90 degrees and 120 degrees of flexion. Testing was performed with the nail three millimeters deep to the cartilage (In), flush with the cartilage (Flush), and one millimeter prominent (Out). The intact knee served as the Control. RESULTS: The mean contact areas showed no statistical differences among the four groups. There was a significant increase in mean pressure at 120 degrees and maximum pressure at 90 degrees and 120 degrees for the Out group when compared with the Control, In, and Flush groups (p < 0.001). CONCLUSIONS: There were no significant differences in mean contact pressure, contact area, or maximum pressure among the Control, three-millimeter insertion depth, or flush insertion groups. There was, however, a significant increase in mean and maximum pressures with the nail one millimeter prominent. These results indicate that placement of a retrograde femoral intramedullary nail is critical, but that proper placement should not significantly influence the biomechanics of the patellofemoral joint.
E Morgan; R F Ostrum; J DiCicco; J McElroy; A Poka
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of orthopaedic trauma     Volume:  13     ISSN:  0890-5339     ISO Abbreviation:  J Orthop Trauma     Publication Date:  1999 Jan 
Date Detail:
Created Date:  1999-03-10     Completed Date:  1999-03-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8807705     Medline TA:  J Orthop Trauma     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  13-6     Citation Subset:  IM    
Maryville Orthopedic Clinic, Tennessee, USA.
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MeSH Terms
Bone Nails*
Femoral Fractures / surgery
Fracture Fixation, Intramedullary
Knee Joint / physiology*

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

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