Blade Plate Compared with Locking Plate for Tibiotalocalcaneal Arthrodesis: A Cadaver Study

Background: We hypothesized that a locking plate would be stronger than a blade plate for tibiotalocalcaneal arthrodesis under dorsiflexion and torsional loading. Materials and Methods: Nine pairs of matched cadaveric lower extremities were used. BMD was obtained for each specimen. Each received a r...

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Bibliographic Details
Published in:Foot & ankle international 2008-02, Vol.29 (2), p.219-224
Main Authors: Chodos, Marc D., Parks, Brent G., Schon, Lew C., Guyton, Gregory P., Campbell, John T.
Format: Article
Language:English
Subjects:
Aged
Aged, 80 and over
Ankle Joint - surgery
Arthrodesis - instrumentation
Bone Density
Bone Plates
Bone Screws
Cadaver
Equipment Design
Equipment Failure Analysis
Female
Humans
Male
Middle Aged
Range of Motion, Articular
Subtalar Joint - surgery
Torsion, Mechanical
Weight-Bearing
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Summary:Background: We hypothesized that a locking plate would be stronger than a blade plate for tibiotalocalcaneal arthrodesis under dorsiflexion and torsional loading. Materials and Methods: Nine pairs of matched cadaveric lower extremities were used. BMD was obtained for each specimen. Each received a retrograde augmentation screw and a stainless steel LC-angled blade plate (Synthes, Paoli, PA) or a stainless steel LCP proximal humerus locking plate (Synthes, Paoli, PA). Specimens were cyclically loaded in dorsiflexion to simulate 6 weeks of partial weightbearing and then monotonically loaded to failure. Specimens were removed from the load frame and remounted to simulate fusion. The specimen received an axial load of 720 N and was externally rotated proximal to the construct at 5 degrees/sec to fracture. Data were compared with a Student's t-test. Pearson correlation analysis was used to determine whether bone mineral density was significantly related to measured parameters. Significance was set at p ≤ 0.05. Results: The locking plate group had higher initial stiffness, higher dorsi-flexion and torsional load to failure, and lower construct deformation than the blade plate group. Bone mineral density was positively correlated with dorsiflexion failure load and torsional failure load in the locking plate construct. Conclusion: Fixation with the locking plate was superior to that with the blade plate. Clinical Relevance: Use of a locking plate may be an effective fixation technique in tibiotalocalcaneal arthrodesis, especially in complex hindfoot reconstructions with bone loss or deformity.
ISSN:1071-1007
1944-7876
DOI:10.3113/FAI.2008.0219