Measurement of knee stiffness and laxity in patients with documented absence of the anterior cruciate ligament.

Markolf, Keith L.; Kochan, A; Hc, Amstutz

doi:10.2106/00004623-198466020-00011

Cited by 290 publications

(164 citation statements)

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“…The external rotation as functions of flexion were close to the experimental values and the varus-valgus laxity data were close to the experimental findings of Markolf et al (1976Markolf et al ( ,1978Markolf et al ( , 1984. Here the lack of capsular structures and menisci were well compensated for.…”

Section: Discussionsupporting

confidence: 83%

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Validation of a three-dimensional model of the knee

Blankevoort

Huiskes

1996

Journal of Biomechanics

186

114

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Abstract-Three-dimensional mathematical models of the tibio-femoral joint require input of the geometry of articulating surfaces and ligament insertions, and the mechanical properties of cartilage and ligaments. This paper describes a validation of a knee model through a direct specimen-related comparison between the knee model and the kinematics of four knee joint specimens from which the geometry data were used as input of the model The knee model is quasi-static and is based on equilibrium of forces and moments. The stiffness properties of the ligaments and articular cartilage were estimated on the basis of data reported in the literature. The so-called reference strains in the ligament bundles for the joint in extension, were determined by using an optimization procedure, minimizing the difference between the kinematics of the model and the kinematics of experimentally obtained flexion motions with an internally or an externally rotated tibia (±3 Nm load). A reasonable to good agreement between the model and the experimental kinematics could be obtained for internal-external rotation laxity and the coupled translations and varus-valgus rotation. The disparity between model and experiment varied from knee to knee, average deviations ranging from close to zero to 8° internal rotation deviation and from 5 mm posterior to 3 mm anterior position deviation. The average anterior-posterior laxities at both 20° and 90° flexion were within the variations reported in the literature, although for each individual joint with some underestimation or overestimation. It was concluded that the optimization procedure compensated for the lack of menisci and capsular structures by higher prestrains, thereby overestimating the ligament forces, Despite the gross simplifica tions relative to the complex anatomy of the knee, the present knee model can realistically simulate the passive motion characteristics of the human knee joint.

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Section: Discussionsupporting

confidence: 83%

“…The V-V laxities of the four models at extension and 20° flexion of the four optimized models compare very well with the average data of Markolf et al (1976Markolf et al ( ,1978Markolf et al ( ,1984 (Fig. 5).…”

Section: Experiments Not Optimized Opt To I-e Opt To I-e and A-psupporting

confidence: 72%

Validation of a three-dimensional model of the knee

Blankevoort

Huiskes

1996

Journal of Biomechanics

186

114

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“…Above this degree of flexion, the increase in rotation induced by the lesion was not detectable anymore [25,71]. Early in vivo studies demonstrated a similar increase of rotation in the injured knee by 10 % (3°) compared to the healthy knee [72]. More specifically, the posterolateral bundle may play a specific role in restraining rotation as its section induced the major increase (3°at 5 Nm) in internal rotation [73].…”

Section: Knee Laxity In the Injured Knee Diagnosis Of Acl Injuriesmentioning

confidence: 90%

Objective measurements of static anterior and rotational knee laxity

Mouton

Theisen

Seil

2016

Curr Rev Musculoskelet Med

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Several devices allow to measure anterior and rotational static knee laxity. To date, the use of rotational laxity measurements in the daily clinical practice however remains to be improved. These measurements may be systematically integrated to the follow-up of knee injuries. Physiologic laxity measurements may particularly be of interest for the identification of risk factors in athletes. Furthermore, knee laxity measurements help to improve the diagnosis of knee soft tissue injuries and to follow up reconstructions. Further prospective follow-ups of knee laxity in the injured/reconstructed knees are however required to conclude on the best treatment strategy for knee soft tissue injuries.

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“…Esta, nos termos discutidos aqui, é definida como a propriedade que representa a proporção direta entre a força aplicada e o alongamento observado no tecido, e pode ser percebida pelo grau de inclinação da região linear da curva carga versus alongamento 29 . Portanto, a ausência de incrementos ou decréscimos significativos pode ser parcialmente explicada como um reflexo do comportamento indistinto dos músculos nas propriedades ALP e ALM.…”

Section: Análise Estatísticaunclassified

Efeito do ultrassom terapêutico sobre as propriedades mecânicas do gastrocnêmio em ratos

Barbosa

Filho

Nonato

et al. 2014

Rev Bras Med Esporte

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INTRODUÇÃO: Apesar de algumas controvérsias quanto à sua utilização, o ultrassom terapêutico (UST) é um recurso comumente aplicado na reabilitação desportiva para aceleração do reparo tecidual de lesões musculares. Sabe-se que lesões musculares influenciam negativamente as propriedades mecânicas da musculatura estriada esquelética e algumas evidências demonstram que o UST poderia ter efeitos benéficos sobre o reparo muscular e, consequentemente, sobre suas propriedades mecânicas.OBJETIVO: Analisar o efeito do UST no reparo tecidual por meio das propriedades mecânicas musculares de ratos após trauma por criolesão.MÉTODOS: Foram utilizados no estudo 30 ratos da linhagem Wistar, os quais foram divididos em três grupos: grupo controle intacto (GC), grupo lesionado sem tratamento (GL), e grupo lesionado e estimulado com UST (frequência de 1 MHz; intensidade de 0,5 W/cm2; ciclo de trabalho de 50%; por quatro minutos diários), durante sete dias consecutivos (GLUST). As propriedades mecânicas obtidas através de ensaio mecânico de tração foram avaliadas em uma máquina universal de ensaios.RESULTADOS: Foram analisados estatisticamente, com nível de significância de 95% (P<0,05). Após sete sessões de tratamento, houve melhora estatisticamente significativa nas propriedades mecânicas de carga no limite de proporcionalidade, carga no limite máximo e resiliência para o GLUST em relação ao GL (p<0,05).CONCLUSÃO: O UST foi eficaz no processo de reparo tecidual, conferindo ao tecido muscular maior resistência à tração e absorção de energia.

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Measurement of knee stiffness and laxity in patients with documented absence of the anterior cruciate ligament.

Cited by 290 publications

References 0 publications

Validation of a three-dimensional model of the knee

Validation of a three-dimensional model of the knee

Objective measurements of static anterior and rotational knee laxity

Efeito do ultrassom terapêutico sobre as propriedades mecânicas do gastrocnêmio em ratos

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