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Activities Supporting Work Ability in Workers with Chronic Diseases
Published in Joanna Bugajska, Teresa Makowiec-Dąbrowska, Tomasz Kostka, Individual and Occupational Determinants, 2020
As a rule, the first signs and symptoms of osteoarthritis occur in people between 40 and 60 years of age. They may affect one, several or (less often) multiple joints, and include joint tenderness, especially during movements and later also at rest and at night. The basic symptoms of osteoarthritis include pain and joint stiffness. The later symptoms include bone deformities (bone spurs formed around the affected joint) and mobility limitation. The estimated prevalence of osteoarthritis is 9.6% and 18% in the male and female population over 60 years of age, respectively. In 80% of the population, it is manifested by a limited mobility and in 25% of the limitation of usual daily life activity performance is observed (WHO 2020).
Hysteresis and stiffness of the lateral ankle complex in those with chronic ankle instability
Published in Sports Biomechanics, 2022
Cathleen N. Brown, Christine O. Samson, Katherine L. Hsieh
Joint stiffness is thought to represent a combination of unique stiffness values each contributed by muscles, tendons, ligaments, cartilage and bone (Latash & Zatsiorsky, 1993). Ligaments exhibit viscoelastic properties, which influence passive joint stiffness and are important contributors to joint stability (Lin, Kang et al., 2015; Lin, Shau et al., 2015). Viscoelasticity is a time-dependent mechanical behaviour, and the non-linear relationship between stress and strain depends on the time of displacement or load (Kelc et al., 2013; Solomonow, 2009). Injury may alter these properties, with morphologic changes resulting from improper ligament healing or healing in an elongated state (Malmir et al., 2014). The relationship between the history of ankle sprain and mechanical laxity at the lateral ankle complex is unclear (Kovaleski et al., 2014b). Limited previous research has indicated that CAI populations may demonstrate altered laxity or greater length changes in lateral ligaments during stress testing. However, coper groups did not respond consistently across studies, nor were group differences in stiffness evident (Brown et al., 2015; Croy et al., 2012). While the lateral ankle ligaments are the focus of these investigations, the entire lateral ankle complex, including the joint capsule and associated musculotendinous and other soft tissues, are included. Typically, self-reported joint or functional properties are used as inclusion/exclusion criteria, rather than outcomes.
Arthrogenic muscle inhibition and return to sport after arthrofibrosis complicating anterior cruciate ligament surgery
Published in European Journal of Sport Science, 2022
Marc Dauty, Pierre Menu, Olivier Mesland, Alban Fouasson-Chailloux
A strength deficit, difficult to improve by rehabilitation, has also been described in case of arthrofibrosis (Shelbourne et al., 1996). However, this strength deficit is almost never measured, while it is certainly responsible for difficulties to return to daily activities or previous sport (Mayr et al., 2004). It is the consequence of the arthrogenic muscle inhibition, which may be associated to a mechanical part due to the joint stiffness.
Simulating the effect of muscle stiffness and co-contraction on postural stability
Published in Computer Methods in Biomechanics and Biomedical Engineering: Imaging & Visualization, 2018
Mohammad Shabani, Ian Stavness
Joint stiffness can be estimated using the stiffness of musculotendinous units that are associated with that joint. The stiffness of a muscle fibre in series with tendon stiffness will form the stiffness of a musculotendinous unit. In traditional Hill-type muscle models, the muscle fibre stiffness is the slope of the force–length curve: