AJSM signin
HOME HELP CONTACT US SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Sign In to gain access to subscriptions and/or personal tools.
First published on August 16, 2004, doi:10.1177/0363546504265051
This version was published on October 1, 2004
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow All Versions of this Article:
32/7/1651    most recent
0363546504265051v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in ISI Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrowRequest Permissions
Right arrow Request Reprints
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via ISI Web of Science (1)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Jeys, L.
Right arrow Articles by Harris, N. J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Jeys, L.
Right arrow Articles by Harris, N. J.
Related Collections
Right arrow Ankle
Right arrow Animal studies
Right arrow Biomechanics
The American Journal of Sports Medicine 32:1651-1659 (2004)
© 2004 American Orthopaedic Society for Sports Medicine

Bone Anchors or Interference Screws?

A Biomechanical Evaluation for Autograft Ankle Stabilization

Lee Jeys, MRCS, MSc Orth Eng*,{dagger}, Sotiris Korrosis, PhD{ddagger}, Todd Stewart, PhD{ddagger} and Nicholas J. Harris, FRCS (Orth){dagger}

From the {dagger} Department of Orthopaedic Surgery, Leeds General Infirmary, Leeds Teaching Hospitals, Leeds, United Kingdom, and {ddagger} Department of Mechanical Engineering, the University of Leeds, Leeds, United Kingdom

* Address correspondence to Lee Jeys, MRCS, MSc Orth Eng, Waterstones House, 31A Green Abbey, Hade Edge, Holmfirth, UK HD9 2SH (e-mail: lee.jeys{at}btclick.com).

Background: Autograft stabilization uses free semitendinosus tendon grafts to anatomically reconstruct the anterior talofibular ligament. Study aims were to evaluate the biomechanical properties of Mitek GII anchors compared with the Arthrex Bio-Tenodesis Screw for free tendon reconstruction of the anterior talofibular ligament.

Null Hypothesis: There are no differences in load to failure and percentage specimen elongation at failure between the 2 methods.

Study Design: Controlled laboratory study using porcine models.

Methods: Sixty porcine tendon constructs were failure tested. Re-creating the pull of the anterior talofibular ligament, loads were applied at 70° to the bones. Thirty-six tendons were fixed to porcine tali and tested using a single pull to failure; 10 were secured with anchors and No. 2 Ethibond, 10 with anchors and FiberWire, 10 with screws and Fiberwire, and 6 with partially gripped screws. Cyclic preloading was conducted on 6 tendons fixed by anchors and on 6 tendons fixed by screws before failure testing. Two groups of 6 components fixed to the fibula were also tested.

Results: The talus single-pull anchor group produced a mean load of 114 N and elongation of 37% at failure. The talus single-pull screw group produced a mean load of 227 N and elongation of 22% at failure (P <.05). Cyclic preloading at 65% failure load before failure testing produced increases in load and decreases in elongation at failure. Partially gripped screws produced a load of 133 N and elongation of 30% at failure. The fibula model produced significant increases in load to failure for both. The human anterior talofibular ligament has loads of 139 N at failure with instability occurring at 20% elongation.

Conclusions: Interference screw fixation produced significantly greater failure strength and less elongation at failure than bone anchors.

Clinical Relevance: The improved biomechanics of interference screws suggests that these may be more suited to in vivo reconstruction of the anterior talofibular ligament than are bone anchors.

Key Words: biomechanics • ankle stabilization • autograft • bone anchor • interference screw




This article has been cited by other articles:


Home page
 Am J Sports MedHome page
M. A. Baskies, D. Tuckman, N. Paksima, and M. A. Posner
A New Technique for Reconstruction of the Ulnar Collateral Ligament of the Thumb
Am. J. Sports Med., August 1, 2007; 35(8): 1321 - 1325.
[Abstract] [Full Text] [PDF]


HOME HELP CONTACT US SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2004 by the American Orthopaedic Society for Sports Medicine.