Document Detail


Effect of Tibial Tuberosity Advancement on the Contact Mechanics and the Alignment of the Patellofemoral and Femorotibial Joints.
MedLine Citation:
PMID:  21848944     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Objective: To evaluate the effect of tibial tuberosity advancement (TTA) on patellofemoral (PF) contact mechanics, and alignment of the PF and femorotibial (FT) joints in cranial cruciate ligament (CrCL)-deficient stifles of dogs. Study design: Ex vivo biomechanical study. Animals: Unpaired cadaveric hind limbs (n=9). Methods: Digital pressure sensors placed in the PF joint were used to measure contact force, contact area, peak and mean contact pressure, and peak pressure location with the limb under an axial load of 30% body weight and a stifle angle of 135°. The FT and PF poses were obtained using a 2-dimensional computer digitization technique. Each specimen was tested under normal, CrCL-deficient, and TTA-treated conditions. Data was normalized and analyzed, after testing for normality by Wilk-Shapiro, using 1 sample T-test, paired T-test, and ANOVA; P≤.05 was considered significant. Bonferroni's correction was used when needed. Results: A significant cranioproximal tibial displacement and increase in patellar tilt were found in the CrCL-deficient joints. Both FT and PF alignments were restored after TTA. Contact areas and peak pressure did not vary between conditions. Peak pressure location displaced proximally from intact to CrCL-deficient condition and returned to normal after TTA. Total force measured in the CrCL-deficient stifle and TTA conditions were significantly lower than in the control. Conclusion: TTA restored the normal FT and PF alignment, and reduced the retropatellar force by about 20%.
Authors:
Tomás G Guerrero; Antonio Pozzi; Nicholas Dunbar; Nicolas Kipfer; Michael Haessig; Mary Beth Horodyski; Pierre M Montavon
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-8-16
Journal Detail:
Title:  Veterinary surgery : VS     Volume:  -     ISSN:  1532-950X     ISO Abbreviation:  -     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-8-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8113214     Medline TA:  Vet Surg     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© Copyright 2011 by The American College of Veterinary Surgeons.
Affiliation:
Clinic for Small Animal Surgery, Vetsuisse-Faculty University of Zurich, Zurich, Switzerland Department of Small Animal Clinical Sciences and the Collaborative Orthopaedic Biomechanical Laboratory, University of Florida, Gainesville, FL Department of Mechanical and Aerospace Engineering and the Collaborative Orthopaedic Biomechanical Laboratory, University of Florida, Gainesville, FL Department of Herd Health Management. Vetsuisse-Faculty University of Zurich, Zurich, Switzerland Department of Orthopedics and Rehabilitation and the Collaborative Orthopaedic Biomechanical Laboratory, University of Florida, Gainesville, FL.
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