Dynamic measurement of patellofemoral contact pressure following reconstruction of the medial patellofemoral ligament: An in vitro study

Ostermeier, Sven; Holst, Marc; Bohnsack, Michael; Hurschler, Christof; Stukenborg-Colsman, Christina; Cj, Wirth

doi:10.1016/j.clinbiomech.2006.10.002

Cited by 37 publications

(41 citation statements)

References 36 publications

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“…7 Cadaver studies of simulated weight bearing with knee external rotation or hip adduction indicate that these altered kinematics increase retropatellar stress, which might exacerbate PFPS symptoms. [8][9][10][11] It has been speculated that there is an association between decreased proximal strength and increased altered joint excursion among subjects with PFPS. For example, recent studies demonstrate significantly decreased hip abduction, hip external rotation, and lateral trunk strength among women with PFPS compared with a healthy female control group.…”

Section: Original Research Reportsmentioning

confidence: 99%

Lower Extremity Strength and Mechanics during Jumping in Women with Patellofemoral Pain

Willson

Davis²

2009

Journal of Sport Rehabilitation

119

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Context: Lower extremity (LE) weakness might be associated with altered mechanics during weight bearing in subjects with patellofemoral pain syndrome (PFPS). Objective: To analyze LE strength, mechanics, and the association between these variables among women with and without PFPS during a simulated athletic task. Design: Case control. Setting: Motion-analysis laboratory. Subjects: 20 women with PFPS and 20 healthy women. Main Outcome Measures: Peak isometric lateral trunk-flexion, hipabduction, hip external-rotation, knee-flexion, and knee-extension strength, as well as hip-and knee-joint excursions and angular impulses during single-leg jumps. Results: PFPS subjects produced less hip-abduction, hip external-rotation, and trunk lateralflexion force than the control group. The PFPS group also demonstrated greater hipadduction excursion and hip-abduction impulses. The association between the strength measurements and LE mechanics was low. Conclusions: Women with PFPS demonstrate specific weaknesses and altered LE mechanics. Weakness is not, however, highly correlated with observed differences in mechanics.

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Section: Original Research Reportsmentioning

confidence: 99%

Lower Extremity Strength and Mechanics during Jumping in Women with Patellofemoral Pain

Willson

Davis²

2009

Journal of Sport Rehabilitation

119

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“…For this reason, a torque value corresponding to one third of the value of 31 N.m was applied for the flexion moment, as discussed by Beck et al (30) . With the aim of maintaining the same proportions between the flexion torque and the load applied to the patella, the value of one third of 100 N recommended by Ostermeier et al (40) was used to promote lateralization of the patella.…”

Section: Discussionmentioning

confidence: 99%

Método de ensaio biomecânico para análise da isometricidade na reconstrução do ligamento patelofemoral medial

Sadigursky¹,

Gobbi²,

Pereira³

et al. 2012

Rev. bras. ortop.

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Objective: To present a biomechanical device for evaluating medial patellofemoral ligament (MPFL) reconstruction and its isometricity. Methods: An accessible biomechanical method that allowed application of physiological and non-physiological forces to the knee using a mechanical arm and application of weights and counterweights was developed, so as to enable many different evaluations and have a very accurate measurement system for distances between different structures, for analysis on experiments. This article describes the assembly of this system, and suggests some practical applications. Six cadaver knees were studied. The knees were prepared in a testing machine developed at the Biomechanics Laboratory of IOT--HCFMUSP, which allowed dynamic evaluation of patellar behavior, with quantification of patellar lateralization beRev Bras Ortop. 2012;47(5):598-605

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“…To measure the patellofemoral contact pressure distribution during in vitro tests with native knees, the Tekscan sensor is mostly fixed to the patella (see Figure 2) [17][18][19], only one experiment in which the sensor was fixed to the trochlea of the femur was reported [20]. If the tibiofemoral contact pressure has to be measured, the sensor can be fixed on the femoral plateau underneath [21][22][23][24][25] or on top of the menisci [26].…”

Section: Mounting Techniquesmentioning

confidence: 99%

“…Accuracy of Tekscan sensor for intra-articular pressure measurements The accuracy of the Tekscan sensor changes when used for intra-articular measurements compared to static measurements between flat surfaces [5,19,29,37]. However, most researchers use the accuracy of a static calibration test between flat surfaces without performing a validation test to define the accuracy level of the intra-articular pressure measurements.…”

Section: 3mentioning

confidence: 99%

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Use of Tekscan pressure sensors for measuring contact pressures in the human knee joint

Herregodts

Baets

Victor

et al. 2015

SCAD

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Abstract:The Tekscan pressure sensor is a common instrument to quantify in vitro tibiofemoral and patellofemoral contact pressures, which helps to understand the impact of surgical intervention such as total knee arthroplasty (TKA). As a result of the non-linear behavior of the sensor, the conditioning, normalization and calibration of the sensor are critical to achieve correct measurements. In this paper, a literature review is presented that provides insight in the correct use of these sensors, resulting in optimal accuracy. To guarantee the repeatability of the measurements, a secure and correct fixation of the sensor in the joint is required. Using the sensor for intra-articular measurements induces several unintended effects, which potentially lower the accuracy of the measurement. First, the uneven surface can result in wrinkling and destruction of the sensor, in turn leading to measurement results that can be corrupted. Second, the presence of shear forces on the sensor can lead to wear of the sensor and reduction in sensitivity with loss of accuracy as a result. Also the fixation method can worsen the accuracy. In literature, a deterioration of the accuracy from 3% under optimal conditions to errors of more than 50% are reported as a result of the aforementioned effects.

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Dynamic measurement of patellofemoral contact pressure following reconstruction of the medial patellofemoral ligament: An in vitro study

Cited by 37 publications

References 36 publications

Lower Extremity Strength and Mechanics during Jumping in Women with Patellofemoral Pain

Lower Extremity Strength and Mechanics during Jumping in Women with Patellofemoral Pain

Método de ensaio biomecânico para análise da isometricidade na reconstrução do ligamento patelofemoral medial

Use of Tekscan pressure sensors for measuring contact pressures in the human knee joint

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