Biomechanical behavior of valgus foot in children with cerebral palsy: A comparative study

Guo, Junchao; Wang, Lizhen; Mo, Zhongjun; Chen, Wei

doi:10.1016/j.jbiomech.2015.07.004

Cited by 10 publications

(3 citation statements)

References 42 publications

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“…Prior to applying the correct loading on the navicular bone condition, the superior cross section surface of the tibia, fibula, and skin was fixed at the six degrees of freedom, and the initial tendon force of 375 N was properly adjusted until the foot was properly aligned relative to the insole [15–17]. In the second step, the displacement of the navicular bone achieved in the previously described in vivo experiment was applied on the reference point of the navicular bone in vertical direction by keeping the freedom in other direction to allow coupling motion and to simulate the correcting effect of different orthopedic insoles.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Arch Height and Material Hardness of Personalized Insole on Correction and Tissues of Flatfoot

Guo

2017

Journal of Healthcare Engineering

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Flat foot is one of the common deformities in the youth population, seriously affecting the weight supporting and daily exercising. However, there is lacking of quantitative data relative to material selection and shape design of the personalized orthopedic insole. This study was to evaluate the biomechanical effects of material hardness and support height of personalized orthopedic insole on foot tissues, by in vivo experiment and finite element modeling. The correction of arch height increased with material hardness and support height. The peak plantar pressure increased with the material hardness, and these values by wearing insoles of 40° were apparently higher than the bare feet condition. Harder insole material results in higher stress in the joint and ligament stress than softer material. In the calcaneocuboid joint, the stress increased with the arch height of insoles. The material hardness did not apparently affect the stress in the ankle joints, but the support heights of insole did. In general, insole material and support design are positively affecting the correction of orthopedic insole, but negatively resulting in unreasonable stress on the stress in the joint and ligaments. There should be an integration of improving correction and reducing stress in foot tissues.

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Section: Methodsmentioning

confidence: 99%

The Effect of Arch Height and Material Hardness of Personalized Insole on Correction and Tissues of Flatfoot

Guo

2017

Journal of Healthcare Engineering

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“…The contact option of surface-to-surface in software was used in the relationship of joint setting. To simulate the covering layers of articular cartilages, compressive properties resembling cartilaginous material was used between each pair of joint contact surfaces [23,26]. The interaction between the ankle brace and the skin was defined by the pretension force in ABAQUS.…”

Section: Fe Modelmentioning

confidence: 99%

Effect of Different Protection on Lateral Ankle during Landing: An Instantaneous Impact Analysis

Yang

Wang

et al. 2022

Bioengineering

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Ankle sprain is the most common injury during parachute landing. The biomechanical behavior of the tissues can help us understand the injury mechanism of ankle inversion. To accurately describe the injury mechanism of tissues and assess the effect of ankle protection, a stable time of landing was obtained through the dynamic stability test. It was used for the boundary condition of the foot finite element (FE). The FE model was provided a static load equal to half of the bodyweight applied at the distal tibia and fibula; a foot-boot-brace FE model was established to simulate the landing of subjects on an inversion inclined platform of 0°–20°, including non-, external, and elastic ankle braces. Compared with the non-ankle brace, both the external and elastic ankle braces decreased the peak strains of the cal-fibular, anterior Ta-fibular, and posterior Ta-fibular ligaments (15.2–33.0%), and of the peak stress of the fibula (15.2–24.5%). For the strain decrement of the aforementioned ligaments, the elastic brace performed better than the external ankle brace under the inversion of the 10° condition. The peak stress of the fibula (15.6 MPa) decreased up to 24.5% with an elastic brace and 5.6–10.3% with an external brace. The findings suggested that the behaviors of lateral ankle ligaments and fibula were meaningful for the functional ability of the ankle. This provides some suggestions regarding the optimal design of ankle protection.

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“…Surgical treatment is indicated for patients who no longer tolerate orthotics or when lever arm dysfunction interferes with function. Surgical procedures described include subtalar extraarticular arthrodesis, triple arthrodesis, and arthroereisis of the sinus tarsi [12][13][14]. CLO, initially introduced by Evans in 1975, underwent modifications by Mosca in 1995 [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Corrective Efficacy of Calcaneal Lengthening Osteotomy for Planovalgus Deformity in Cerebral Palsy Patients

Dubey,

Pathan,

Sharma

2024

Cureus

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IntroductionPlanovalgus deformity is common in children with spastic cerebral palsy (CP), particularly spastic diplegia and spastic quadriplegia. It results from muscle imbalance over the immature foot skeleton, leading to hindfoot valgus, forefoot abduction, and joint subluxation. Surgical interventions, like calcaneal lengthening osteotomy (CLO), are frequently employed to correct this deformity, but objective guidelines for its use in CP patients are lacking. Material and methodsThis retrospective cohort study examined the efficacy of CLO in correcting plano valgus deformity in pediatric CP patients at the Pediatric Orthopedic Unit of Christian Medical College (CMC) in Vellore, India. Data from patient records and radiographs were collected, including demographics, pre-and postoperative angles, and surgical details. Statistical analysis was performed to assess changes in angles and associations with various factors. ResultsAfter the surgery, there was a notable enhancement in the calcaneal pitch, lateral talo-first metatarsal angle, and naviculocuboid overlap, as shown by the CLO results. However, tibiocalcaneal angles did not show significant changes. Associations were observed between age, Gross Motor Function Classification System (GMFCS) level, additional surgeries, and postoperative angle corrections. ConclusionCLO shows promise in correcting plano valgus deformity, with age, GMFCS level, and comorbidities influencing outcomes. Long-term follow-up is crucial to monitor correction durability. Specific radiographic angles provide insights into CLO's biomechanical effects, but study limitations warrant caution in interpretation. CLO effectively corrects plano valgus deformity in pediatric CP patients, with age, GMFCS level, and comorbidities influencing outcomes. Long-term follow-up and further research are needed to optimize management strategies and enhance understanding of surgical outcomes.

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Biomechanical behavior of valgus foot in children with cerebral palsy: A comparative study

Cited by 10 publications

References 42 publications

The Effect of Arch Height and Material Hardness of Personalized Insole on Correction and Tissues of Flatfoot

The Effect of Arch Height and Material Hardness of Personalized Insole on Correction and Tissues of Flatfoot

Effect of Different Protection on Lateral Ankle during Landing: An Instantaneous Impact Analysis

Corrective Efficacy of Calcaneal Lengthening Osteotomy for Planovalgus Deformity in Cerebral Palsy Patients

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