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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.

Skomoroshko PV, Vilensky VA, Hammouda AI, Fletcher MD, Solomin LN - Adv Orthop (2014)

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Vreden Russian Research Institute of Traumatology and Orthopedics, 8 Baykova Street, Saint Petersburg 195427, Russia.

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.

No MeSH data available.


Related in: MedlinePlus

Method of designation of positions of strut-to-ring fixation using a clock-face analogy: strut number 1 is fixed in position 12, strut number 3 is fixed in position 7, and strut number 5 is fixed in position 4.
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fig3: Method of designation of positions of strut-to-ring fixation using a clock-face analogy: strut number 1 is fixed in position 12, strut number 3 is fixed in position 7, and strut number 5 is fixed in position 4.

Mentions: The experiments were divided into three series. Initially, we evaluated strut configurations for each of the three levels of the femur. Usually, incomplete rings and arches are used in frames for deformity correction in the femur, and so optimal equilateral triangular placement of struts has been difficult or impossible. Therefore, “unequilateral” strut configuration was necessary and thus the most effective configurations to obtain maximal corrective potential were investigated. With the OSF, strut position can be varied greatly and do not need symmetrical connection to the frame. To describe various strut configurations we described the circles of proximal and distal rings as a clock face and designated the strut's number and position on the ring in which the strut is fixed, with the 12 o'clock position being anterior in all cases (Figure 3).


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.

Skomoroshko PV, Vilensky VA, Hammouda AI, Fletcher MD, Solomin LN - Adv Orthop (2014)

Method of designation of positions of strut-to-ring fixation using a clock-face analogy: strut number 1 is fixed in position 12, strut number 3 is fixed in position 7, and strut number 5 is fixed in position 4.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4291198&req=5

fig3: Method of designation of positions of strut-to-ring fixation using a clock-face analogy: strut number 1 is fixed in position 12, strut number 3 is fixed in position 7, and strut number 5 is fixed in position 4.
Mentions: The experiments were divided into three series. Initially, we evaluated strut configurations for each of the three levels of the femur. Usually, incomplete rings and arches are used in frames for deformity correction in the femur, and so optimal equilateral triangular placement of struts has been difficult or impossible. Therefore, “unequilateral” strut configuration was necessary and thus the most effective configurations to obtain maximal corrective potential were investigated. With the OSF, strut position can be varied greatly and do not need symmetrical connection to the frame. To describe various strut configurations we described the circles of proximal and distal rings as a clock face and designated the strut's number and position on the ring in which the strut is fixed, with the 12 o'clock position being anterior in all cases (Figure 3).

Bottom Line: 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.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.

View Article: PubMed Central - PubMed

Affiliation: Vreden Russian Research Institute of Traumatology and Orthopedics, 8 Baykova Street, Saint Petersburg 195427, Russia.

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.

No MeSH data available.


Related in: MedlinePlus