scholarly journals MATHEMATICAL MODELING OF OSTEOSYNTHESIS OF THE LOWER LEG BONES DURING THEIR CONGENITAL PSEUDARTHROSIS IN THE MIDDLE THIRD

2020 ◽  
Vol 4 (1) ◽  
pp. 239
Author(s):  
S. O. Khmyzov ◽  
E. S. Katsalap ◽  
M. Yu. Karpinsky ◽  
O. V. Yaresko
Keyword(s):  
Mathematical Modeling ◽  
Lower Leg ◽  
Congenital Pseudarthrosis ◽  
Leg Bones

scholarly journals Mathematical modeling of the osteosynthesis of the lower leg bones using a titanium mesh for their congenital pseudoarthrosis in the lower third

TRAUMA ◽  
2021 ◽  
Vol 22 (4) ◽  
pp. 23-29
Author(s):  
S.O. Khmyzov ◽  
E.S. Katsalap ◽  
M.Yu. Karpinsky ◽  
O.V. Yaresko
Keyword(s):  
Bone Graft ◽  
Strain State ◽  
Lower Leg ◽  
Control Points ◽  
Titanium Mesh ◽  
Non Union ◽  
Congenital Pseudarthrosis ◽  
Almost All ◽  
Leg Bones ◽  
Additional Fixation

Background. Congenital pseudarthrosis of the lower leg bones belongs to the group of orphan diseases and manifests itself in non-union (pseudarthrosis) of the lower leg bones, which leads to the formation of deformity and shortening of the limb, and, as a result, is accompanied by a persistent violation of the limb’s supportability. To date, the question of choosing a surgical technique and optimal fixation in the surgical treatment of congenital pseudarthrosis of the lower leg bones remains unresolved. The purpose was to investigate the stress-strain state of the shin model with pseudarthrosis of its bones in the lower third during their osteosynthesis using a titanium mesh. Materials and methods. Osteosynthesis was simulated with an intramedullary nail, wires, and a block of bone grafts on both shin bones with the imposition of a titanium mesh over the grafts under the influence of two types of compression and torsion loads. Results. Studies have shown that additional fixation of the bone graft block with a titanium mesh allows reducing the stress level at almost all control points of the model of osteosynthesis of the lower leg bones in their congenital pseudarthrosis, both under compression and torsion. As the most positive changes, we can note a decrease in the stress values on the tibia around the nonunion line. This can be explained by the fact that the bone graft block reinforced with a titanium mesh takes on a great load. The same fact contributes to the increase in the level of stress at the lower border of the graft block and tibia. The negative factors include an increase in the level of stress along the line of non-union of the fibula. This is also explained by an increase in the modulus of elasticity of the bone graft block, which further loads the fibula. Conclusions. The use of a titanium mesh for additional fixation of the shin bones in the treatment of their congenital pseudarthrosis has a positive effect on the stress-strain state of the model, which is confirmed by a decrease in the stress level at almost all control points of the model, both under compression and torsion loads. The most positive changes are observed along the line of non-union of the tibia.

scholarly journals The Potential Relationship Between Leg Bone Length and Running Performance in Well‐Trained Endurance Runners

2019 ◽  
Vol 70 (1) ◽  
pp. 165-172 ◽  
Author(s):  
Hiromasa Ueno ◽  
Tadashi Suga ◽  
Kenji Takao ◽  
Yuto Miyake ◽  
Masafumi Terada ◽  
...  
Keyword(s):  
Body Height ◽  
Lower Leg ◽  
Resonance Imaging ◽  
Running Performance ◽  
Race Time ◽  
Tibial Length ◽  
Bone Length ◽  
Endurance Runners ◽  
The Relationship ◽  
Leg Bones

Abstract The present study aimed to determine the relationship between leg bone length and running performance in well-trained endurance runners. The lengths of the leg bones in 42 male endurance runners (age: 20.0 ± 1.0 years, body height: 169.6 ± 5.6 cm, body mass: 56.4 ± 5.1 kg, personal best 5000-m race time: 14 min 59 s ± 28 s) were measured using magnetic resonance imaging. The lengths of the femur and tibia were calculated to assess the upper and lower leg lengths, respectively. The total length of the femur + tibia was calculated to assess the overall leg bone length. These lengths of the leg bones were normalized with body height, which was measured using a stadiometer to minimize differences in body size among participants. The relative tibial length was significantly correlated with personal best 5000-m race time (r = -0.328, p = 0.034). Moreover, a trend towards significance was observed in the relative femoral length (r = -0.301, p = 0.053). Furthermore, the relative total lengths of the femur + tibia were significantly correlated with personal best 5000-m race time (r = -0.353, p < 0.05). These findings suggest that although the relationship between the leg bone length and personal best 5000-m race time was relatively minor, the leg bone length, especially of the tibia, may be a potential morphological factor for achieving superior running performance in well-trained endurance runners.

scholarly journals TREATMENT OF TWO-LEVEL DEFORMITIES OF LOWER LEG BONES: TWO HEXAPODS OR ONE?

2019 ◽  
pp. 83-83
Author(s):  
V.A. Vilenskiy ◽  
E.A. Zakharyan ◽  
T.F. Zubairov ◽  
B.K. Dolgiev ◽  
K.B. Toldieva ◽  
...  
Keyword(s):  
Lower Leg ◽  
Leg Bones

scholarly journals A pilot study on a potential relationship between leg bone length and sprint performance in sprinters; Are there any event-related differences in 100-m and 400-m sprints?

2020 ◽  
Author(s):  
Daichi Tomita ◽  
Tadashi Suga ◽  
Masafumi Terada ◽  
Takahiro Tanaka ◽  
Yuto Miyake ◽  
...  
Keyword(s):  
Body Height ◽  
Lower Leg ◽  
Sprint Performance ◽  
Resonance Imaging ◽  
Femoral Length ◽  
Tibial Length ◽  
Bone Length ◽  
Performance Results ◽  
The Relationship ◽  
Leg Bones

Abstract Objective: This study examined the relationship between leg bone length and sprint performance in sprinters. The leg bone lengths in 28 100-m specialized sprinters and 28 400-m specialized sprinters were measured using magnetic resonance imaging. The lengths of the upper and lower leg bones were assessed by calculating the lengths of the femur and tibia, respectively. To minimize differences in body size among participants, both bone lengths were normalized to body height. The ratio of the tibial length to femoral length was calculated to evaluate the interaction between the lengths of the upper and lower leg bones. International Amateur Athletic Federation (IAAF) scores, based on the personal best times of the sprinters in each group were used as parameters for sprint performance. Results: There were no significant correlations between absolute and relative lengths of the femur and tibia and IAAF scores in both 100-m and 400-m sprinters. By contrast, the ratio of the tibial length to femoral length correlated significantly with IAAF score in 400-m sprinters ( r = 0.445, P = 0.018), but not 100-m sprinters. These findings suggest that the leg bone lengths may play an important role in achieving superior long sprint performance in 400-m specialized sprinters.

scholarly journals Treatment of Pelvic Ring Injury with 3D Printed Patient-Specific Implant: Case Report

2020 ◽  
Vol 26 (2) ◽  
pp. 91-97
Author(s):  
E. I. Solod ◽  
A. F. Lazarev ◽  
R. A. Petrovskiy ◽  
M. A. Abdulkhabirov ◽  
Y. M. Alsmadi
Keyword(s):  
3D Printing ◽  
Multiple Trauma ◽  
Pelvic Ring ◽  
Lower Leg ◽  
Early Postoperative Period ◽  
Patient Specific ◽  
Pubic Bone ◽  
Custom Made ◽  
Both Bones ◽  
Leg Bones

Rationale. The development of 3D printing technology allows the manufacture of individual implants to treat the patients with diseases and consequences of musculoskeletal system injuries. However, the use of additive technologies in the patients with multiple trauma in the acute period is limited. The purpose of study was to demonstrate the possibility of using individual implants for the definitive fixation of the anterior pelvic ring in a patient with multiple trauma.Patient concerns. A 22-year-old patient was admitted after an injury as a result of a fall from the 5th floor. The treatment was carried out in accordance with the ATLS protocol. Diagnosis: multiple trauma; closed chest, pelvis and limbs injuries; fracture of the left 2nd to 5th ribs; pelvic bones fracture AO/ OTA: 61-C1.3a; fracture of both bones of the left lower leg AO/OTA: 42-B3b; 2nd degree shock.Interventions. An emergency external fixation of the pelvis and lower leg bones was performed. An individual implant for pubic bone fixation was made using 3D printing. On the 8th day, the definitive fixation of the pelvic and left lower leg bones was performed. The patient is activated on the 1st day after the surgery.Outcomes. The early postoperative period was uneventful. The functional result on the Majeed scale in 6 months by remote filling out the questionnaire was 84 points. Lessons. The custom-made implants make it possible the successful fixation of the anterior pelvic ring. The use of 3D printing technologies for the osteosynthesis of pelvic fractures is promising, although requires further study.

Relationship between leg bone length and sprint performance in sprinters; Are there any event-related differences in 100-m and 400-m sprints?

2020 ◽  
Author(s):  
Daichi Tomita ◽  
Tadashi Suga ◽  
Masafumi Terada ◽  
Takahiro Tanaka ◽  
Yuto Miyake ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Body Height ◽  
Lower Leg ◽  
Sprint Performance ◽  
Resonance Imaging ◽  
Femoral Length ◽  
Tibial Length ◽  
Bone Length ◽  
The Relationship ◽  
Leg Bones

Abstract Objective: This study examined the relationship between leg bone length and sprint performance in sprinters. The leg bone lengths in 28 100-m specialized sprinters and 28 400-m specialized sprinters were measured using magnetic resonance imaging. The lengths of the upper and lower leg bones were assessed by calculating the lengths of the femur and tibia, respectively. To minimize differences in body size among participants, both bone lengths were normalized to body height. The ratio of the tibial length to femoral length was calculated to evaluate the interaction between the lengths of the upper and lower leg bones. International Amateur Athletic Federation (IAAF) scores, based on the personal best times of the sprinters in each group were used as parameters for sprint performance. Results: There were no significant correlations between absolute and relative lengths of the femur and tibia and IAAF scores in both 100-m and 400-m sprinters. By contrast, the ratio of the tibial length to femoral length correlated significantly with IAAF score in 400-m sprinters (r = 0.445, P = 0.018), but not 100-m sprinters. These findings suggest that the leg bone lengths may play an important role in achieving superior long sprint performance in 400-m specialized sprinters.

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