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J Foot Ankle Surg. 2018 Jul - Aug;57(4):766-770. doi: 10.1053/j.jfas.2018.02.012. Epub 2018 May 8.

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

Author information

1
Assistant Professor, College of Podiatric Medicine and Surgery, Des Moines University, Des Moines, IA. Electronic address: daytonp@me.com.
2
Surgical Director, Podiatric Medicine and Surgery Residency Program, Northern Colorado Medical Center, Greeley, CO.
3
Associate Professor, Department of Orthopaedics, and Chief, Division of Foot and Ankle Surgery, West Virginia University School of Medicine, Morgantown, WV.
4
Director, Foot and Ankle Division, Palmetto Health-USC Orthopedic Center, Lexington, SC; Associate Professor, Department of Orthopedics, University of South Carolina, Lexington, SC.

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 with tension-side fixation endured a significantly greater number of cycles (206,738 ± 49,103 versus 101,780 ± 43,273; p < .001) and a significantly greater dynamic failure load (207.5 ± 24.3 N versus 162.5 ± 20.6 N; p < .001) compared with the straight biplanar plate construct. These results have demonstrated that under simulated static and cyclic Lapidus arthrodesis loading, biplanar plating with tension-side fixation provides superior strength compared with the straight biplanar construct. Thus, this construct shows promise for clinical application as a practical approach to tension-side fixation and an early return to weightbearing after Lapidus fusion.

KEYWORDS:

Lapidus; anatomic bone model; arthrodesis; biomechanical surrogate; hallux abductovalgus; plantar plate

PMID:
29752220
DOI:
10.1053/j.jfas.2018.02.012
[Indexed for MEDLINE]

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