Jaap Harlaar

Videoradiography-based motion analysis: The future of assessing joint pathomechanics in orthopedics?

Wouter Schallig, Niels Dur, Erin Macri, Edwin Oei et autres

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Perspective: One and one make three - leveraging the synergy of imaging and biomechanics in osteoarthritis research and care

Wouter Schallig, N.B.J. Dur, Mariska Wesseling, Rianne A. van der Heijden et autres

Mechanical stress on joint tissues is a central driver of osteoarthritis (OA), yet our understanding of OA pathomechanics remains incomplete, obstructing etiology-driven personalized treatments. Current joint assessment approaches are largely monodisciplinary. In this perspective we aim to advocate for the integration of …

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Quantitative Measurement of Rotational Knee Stability: A Systematic Review of Instrument Reliability and Validity

Frederique Oosterbaan, Mariska Wesseling, T.M. Piscaer, Tjep Hoedemakers et autres

CONTEXT: Objectively evaluating knee stability in multiple planes in individuals with anterior cruciate ligament injury may provide more comprehensive information than evaluating subjectively or in only a single plane. This could support both research and clinical decision making. However, for the clinical …

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Effects of using different optimization metrics in selecting the optimal ankle-foot orthosis stiffness in patients with calf muscle weakness

Yvette Keij, Merel‐Anne Brehm, Niels Wateval, Frans Nollet et autres

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Gait analysis in a matched cohort short versus conventional stems in total hip replacement, is there a measurable difference?

Sheryl de Waard, Inger N. Sierevelt, M.J. Booij, Jaap Harlaar et autres

Introduction By means of gait analysis and EMG measurements, we evaluated the difference between short and conventional hip stems in patients who underwent hip replacement for osteoarthritis. The remaining gait differences after hip replacements are well documented and caused by many factors, …

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Review of upper extremity passive joint impedance identification in people with Duchenne Muscular Dystrophy

Suzanne J. Filius, Kyriacos Papa, Jaap Harlaar

Duchenne Muscular Dystrophy (DMD) progressively leads to loss of limb function due to muscle weakness. The incurable nature of the disease shifts the focus to improving quality of life, including assistive supports to improve arm function. Over time, the passive joint impedance …

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The Design of the Dummy Arm: A Verification Tool for Arm Exoskeleton Development

Suzanne J. Filius, Bas J. van der Burgh, Jaap Harlaar

Motorised arm supports for individuals with severe arm muscle weakness require precise compensation for arm weight and elevated passive joint impedance (e.g., joint stiffness as a result of muscle atrophy and fibrosis). Estimating these parameters in vivo, along with the arm's centre …

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A footmounted sensor assesses the foot progression angle sufficiently accurate during walking when aiming to minimize knee load

Jaap Harlaar, Mariska Wesseling, Heijs Floor, Martin Schepers

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Minimization of metabolic cost of transport predicts changes in gait mechanics over a range of ankle-foot orthosis stiffnesses in individuals with bilateral plantar flexor weakness

Bernadett Kiss, Niels Waterval, Marjolein M. van der Krogt, Merel‐Anne Brehm et autres

Neuromuscular disorders often lead to ankle plantar flexor muscle weakness, which impairs ankle push-off power and forward propulsion during gait. To improve walking speed and reduce metabolic cost of transport (mCoT), patients with plantar flexor weakness are provided dorsal-leaf spring ankle-foot orthoses …

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A FOOTMOUNTED SENSOR ASSESSES THE FOOT PROGRESSION ANGLE DURING WALKING SUFFICIENTLY ACCURATE FOR GAIT RETRAINING

Jaap Harlaar, Mariska Wesseling, Floor Heijs, Martin Schepers

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ANTERIOR CRUCIATE LIGAMENT TEAR AFFECTS TIBIOFEMORAL KINEMATICS, BUT NOT PATELLOFEMORAL KINEMATICS DURING UNLOADED FLEXION

Mariska Wesseling, Frederique Oosterbaan, Jaap Harlaar, T.M. Piscaer

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Skin marker-based versus bone morphology-based coordinate systems of the hindfoot and forefoot

Chantal M. Hulshof, Wouter Schallig, Josien C. van den Noort, Geert J. Streekstra et autres

Segment coordinate systems (CSs) of marker-based multi-segment foot models are used to measure foot kinematics, however their relationship to the underlying bony anatomy is barely studied. The aim of this study was to compare marker-based CSs (MCSs) with bone morphology-based CSs (BCSs) …

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