title: Determination of the Maximal Corrective Ability and Optimal Placement of the Ortho-SUV Frame for Femoral Deformity with respect to the Soft Tissue Envelope, a Biomechanical Modelling Study.
abstract: Circular fixation according to the Ilizarov method is a well-recognised modality of treatment for trauma and deformity. One shortcoming of the traditional fixator is its limited ability to correct more than one plane of deformity simultaneously, leading to lengthy frame-time indices. Hexapod circular fixation utilising computer guidance is commonplace for complex multidimensional deformity but difficulties often arise with correction of femoral deformity due to bulkiness of the frame construct, particularly in proximal deformity and in patients of increased size. The Ortho-SUV frame is an innovative hexapod which permits unique customisation to individual patient anatomy to maximise tolerance and optimal range of deformity correction. We hypothesised that the optimal configuration and maximal degree of correction achievable by the Ortho-SUV frame can be biomechanically modelled and applied clinically. A study was constructed using Ortho-SUV and femoral limb models to measure deformity correction via differing frame constructs and determine optimal frame configuration to achieve correction in proximal, middle, and distal third deformities with respect to the soft tissue envelope. The ideal frame configuration is determined for correction of deformity in all locations of the femur with the maximal parameters of correction calculated whilst avoiding and mitigating soft tissue irritation from bulky frame construction.
authors.affiliation: Vreden Russian Research Institute of Traumatology and Orthopedics, 8 Baykova Street, Saint Petersburg 195427, Russia.
authors.forename: Petr V
authors.initials: PV
authors.lastname: Skomoroshko
authors.affiliation: Vreden Russian Research Institute of Traumatology and Orthopedics, 8 Baykova Street, Saint Petersburg 195427, Russia.
authors.forename: Victor A
authors.initials: VA
authors.lastname: Vilensky
authors.affiliation: Orthopedic Surgery Department, Al-Azhar University Hospitals, 10B Eltaka Street, El-Mabousin Buildings, 8th Area, Nasr City, Cairo 11371, Egypt.
authors.forename: Ahmed I
authors.initials: AI
authors.lastname: Hammouda
authors.affiliation: Department of Surgical Services, Dawson Creek & District Hospital, 11100-13th Street, Dawson Creek, BC, Canada V1G 3W8.
authors.forename: Matt D A
authors.initials: MD
authors.lastname: Fletcher
authors.affiliation: Vreden Russian Research Institute of Traumatology and Orthopedics, 8 Baykova Street, Saint Petersburg 195427, Russia ; Saint Petersburg State University, 7-9 Universitetskaja Street, Saint Petersburg 199034, Russia.
authors.forename: Leonid N
authors.initials: LN
authors.lastname: Solomin