Biomechanical Characteristics of Biplane Multiplanar Tension-Side Fixation for Lapidus Fusion

The Journal of Foot and Ankle Surgery : Official Publication of the American College of Foot and Ankle Surgeons
Paul DaytonBret Smith

Abstract

Although plating on the plantar, tension-side of the metatarsocuneiform joint provides an inherent biomechanical advantage for Lapidus arthrodesis, it has not been widely adopted owing to the morbidity associated with plantar application. To overcome these limitations, a modification to 90-90 locked biplanar plating was developed to provide the biomechanical advantages of multiplanar fixation and tension-side fixation, allowing application through a conventional incision. We tested the hypothesis that biplanar plating with tension-side fixation (low-profile straight dorsal plate and anatomic medial-plantar plate) would demonstrate improved mechanical stability compared with a previously tested 90-90 biplanar construct (small straight plate dorsally and medially) under cyclic loading. Both constructs were tested in static load to failure (3 pairs) and cyclic loading (10 pairs) with plantar cantilever bending using surrogate anatomic bone models. With static ultimate failure, the biplanar plate construct with tension-side fixation failed at a significantly greater failure load than did the straight biplanar plate construct (247.3 ± 18.4 N versus 210.9 ± 10.4 N; p = .04). With cyclic failure testing, the biplanar plate construct w...Continue Reading

Citations

Jun 22, 2021·The Journal of Foot and Ankle Surgery : Official Publication of the American College of Foot and Ankle Surgeons·William T DeCarboRobert D Santrock

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