Characteristics of stress-strain foot model before and after subtalar arthroereisis with implants at the treatment of flatfoot (message 2)

Korolkov, Oleksandr; Rakhman, Paviel; Karpinsky, Mykhaylo; Shishka, Igor; Yaresko, Oleksandr

doi:10.15674/0030-59872018165-71

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…Для вирішення поставленого завдання раніше розроблено [6,7] математичну скінченно-елементну модель (МСЕМ) дистального кінця нижньої кінцівки із доповненнями, яка містила кісткові елементи стопи та гомілки (рис. 1).…”

Section: матеріал і методиunclassified

Mathematical Modeling of the Stress-Strain Relations of the Foot Elements in the Conditions of Lateral Malleolus Hypoplasia

Shishka¹,

Korolkov²,

Karpinsky³

et al. 2022

OTP

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One of the most common complications of long-term talocrural joint (TCJ) injury is the development of chronic instability. Among the risk factors for its occurrence - congenital or acquired shortening (hypoplasia) of the lateral malleolus of varying degrees. Objective. Determine the effect of lateral malleolus hypoplasia on the distribution of stresses in the bone and ligament elements of the foot. Methods. Mathematical modeling of the distal end of thelower extremity was performed. There are two variants of the position of the heel bone — varus and valgus with an angle of deviation from the vertical axis in both cases 15°. A vertical distributed load of 700 N was applied to the tibial plateau. On the supporting surface of the feet model's were rigidly fixed. Measurements of mechanical stresses were performed at control points. According to the criteria for estimating the stress-strain relations (SSR), the Misesstress was used. Results. It was determined that lateral malleolus hypoplasia increases the values of stresses on the lateral side of the distal tibial bone from 6.3 MPa to 6.4 MPa, from the medial — on the heel bone from 5.8 MPa to 6.0 MPa, talus from 2.1 MPa to 2.3 MPa. SSR on TCJ are also varies. In the case of a neutral position of the heel bone, lateral malleolus hypoplasia causes a decrease in the values of the ligaments on the lateral side of the TCJ,which can be explained by their elongation and, consequently, the projection increase in length In the case of varus or valgus position of the heel bone under conditions of lateral ankle hypoplasia, it was found that the varus position of the heel bone overstrains the ligaments on the lateral side, valgus - from the medial. Conclusions. Decreased stress in the ligaments of the TCJ in cases of valgus or varus position of the heel bone is one of the factors reducing the functional stability of the joint and may be the cause of its chronic instability.

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Section: матеріал і методиunclassified

Mathematical Modeling of the Stress-Strain Relations of the Foot Elements in the Conditions of Lateral Malleolus Hypoplasia

Shishka¹,

Korolkov²,

Karpinsky³

et al. 2022

OTP

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show abstract

“…За скінчений елемент обирали 10-вузловий тетраедр із квадратичною апроксимацією. Механічні властивості біологічних тканин обирали за даними літератури [2,9,10,14]. Характеристики штучних матеріалів обирали за даними технічної літератури [11].…”

Section: оригінальні дослідження ортопедіяunclassified

Biomechanical rationale for choosing a means of fixation of bone fragments during proximal osteotomy of the first metatarsal bone

Prozorovskiy¹,

Romanenko²,

Karpinsky³

et al. 2022

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One of the most common pathologies that occurs in static deformities of the anterior joint of the foot in the foot is valgus deformity of the first toe. Distal or diaphyseal osteotomies are used for mild degrees, and proximal osteotomies for severe ones. Spikes, screws or plates with angular stability are most often used to fix bone fragments. Purpose - with the help of biomechanical studies, to study the stress-deformed state of the foot model with different options for osteosynthesis of the first metatarsal bone after the proximal osteotomy. Materials and methods. Mathematical modeling of osteosynthesis of the first metatarsal bone during correction of valgus deformity of the first toe using proximal osteotomy was carried out. Three variants of osteosynthesis were modeled: Kirschner pins, screws, and a bone plate. Results. During osteosynthesis with spikes, maximum stresses of 2.1 MPa occur in distal fragment. In the proximal fragment, the stresses are twice as low - 1.2 MPa. The tension in the resection zone is 0.1 MPa. During osteosynthesis with screws, the stresses in the proximal and distal fragments of the bone are almost the same, and are 0.9 MPa and 0.8 MPa, respectively. The tension in the osteotomy zone is 0.1 MPa. Osteosynthesis with a bone plate provides a low level of stresses in the osteotomy zone - 0.1 MPa, as well as an even distribution of stresses between the proximal and distal fragments of the metatarsal bone - 0.8 MPa and 0.7 MPa, respectively. During osteosynthesis with spikes and screws, the relative deformation of the bone regenerate does not exceed 0.13%. During osteosynthesis with a bone plate, this figure reaches 0.5%. Conclusions. For osteosynthesis of bone fragments during proximal osteotomy of the first metatarsal bone in order to eliminate valgus deformity of the first toe, spikes, screws and a bone plate can be used. All investigated types of osteosynthesis provide a low level of stress in the osteotomy zone of the first metatarsal bone, but, according to the criterion of stress values in the proximal and distal fragments of the bone, osteosynthesis with spikes showed the worst result, and osteosynthesis with a bone plate showed the best. The research was carried out in accordance with the principles of the Helsinki Declaration. The study protocol was approved by the Local Ethics Committee of the participating institution. The informed consent of the patient was obtained for conducting the studies. No conflict of interests was declared by the authors.

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Characteristics of stress-strain foot model before and after subtalar arthroereisis with implants at the treatment of flatfoot (message 2)

Cited by 2 publications

References 6 publications

Mathematical Modeling of the Stress-Strain Relations of the Foot Elements in the Conditions of Lateral Malleolus Hypoplasia

Mathematical Modeling of the Stress-Strain Relations of the Foot Elements in the Conditions of Lateral Malleolus Hypoplasia

Biomechanical rationale for choosing a means of fixation of bone fragments during proximal osteotomy of the first metatarsal bone

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