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Chris Hopkins

Osteoarthritis (OA) is a highly prevalent disease among older adults ( Lawrence et al., 2008 ) and one of the leading causes of functional loss and disability ( Cross et al., 2014 ). Physical activity has been deemed crucial to optimal health outcomes, which has led to federal recommendations for

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Daniël M. van Leeuwen, Fabian van de Bunt, Cornelis J. de Ruiter, Natasja M. van Schoor, Dorly J.H. Deeg, and Kaj S. Emanuel

Knee osteoarthritis (OA) represents an increasing burden in developed countries ( Arden & Nevitt, 2006 ). Progression of knee OA is usually assessed using radiographic scores such as the Kellgren & Lawrence scale (K&L-score) ( Kellgren & Lawrence, 1957 ). Radiographic scores correlate to some

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Inga Krauss, Thomas Ukelo, Christoph Ziegler, Detlef Axmann, Stefan Grau, Thomas Horstmann, and Alex Stacoff

Results from instrumented gait analysis vary between test situations. Subject characteristics and the biomechanical model can influence the total amount of variability. The purpose of this study was to quantify reliability of gait data in general, and with respect to the applied model, and investigated population group. Reliability was compared between a functional and a predictive gait model in subjects with knee osteoarthritis and healthy controls. Day-to-day consistency for sagittal plane variables was comparable between models and population groups. Transversal plane variables relative to joint excursion showed larger inconsistency for repeated measures, even for a more sophisticated biomechanical approach. In conclusion, the presented reliability data of sagittal plane kinematics should be used for a reasonable interpretation of results derived in clinical gait analysis. Variables of the transversal plane should not be used as long as sources of error are not sufficiently minimized.

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Erik J. Timmermans, Suzan van der Pas, Elaine M. Dennison, Stefania Maggi, Richard Peter, Maria Victoria Castell, Nancy L. Pedersen, Michael D. Denkinger, Mark H. Edwards, Federica Limongi, Florian Herbolsheimer, Mercedes Sánchez-Martínez, Paola Siviero, Rocio Queipo, Laura A. Schaap, Dorly J.H. Deeg, and for the EPOSA research group


Older adults with osteoarthritis (OA) often report that their disease symptoms are exacerbated by weather conditions. This study examines the association between outdoor physical activity (PA) and weather conditions in older adults from 6 European countries and assesses whether outdoor PA and weather conditions are more strongly associated in older persons with OA than in those without the condition.


The American College of Rheumatology classification criteria were used to diagnose OA. Outdoor PA was assessed using the LASA Physical Activity Questionnaire. Data on weather parameters were obtained from weather stations.


Of the 2439 participants (65–85 years), 29.6% had OA in knee, hand and/or hip. Participants with OA spent fewer minutes in PA than participants without OA (Median = 42.9, IQR = 20.0 to 83.1 versus Median = 51.4, IQR = 23.6 to 98.6; P < .01). In the full sample, temperature (B = 1.52; P < .001) and relative humidity (B = –0.77; P < .001) were associated with PA. Temperature was more strongly associated with PA in participants without OA (B = 1.98; P < .001) than in those with the condition (B = 0.48; P = .47).


Weather conditions are associated with outdoor PA in older adults in the general population. Outdoor PA and weather conditions were more strongly associated in older adults without OA than in their counterparts with OA.

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Brian Pietrosimone, Adam S. Lepley, Christopher Kuenze, Matthew S. Harkey, Joseph M. Hart, J. Troy Blackburn, and Grant Norte

, indicating a significant need to optimize rehabilitation for the purpose of minimizing the risk of ACL reinjury. 6 Moreover, 50% of individuals develop posttraumatic osteoarthritis within 2 decades of ACL injury, 7 suggesting that the most serious consequences of ACL injury may extend long after completion

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Christopher M. Saliba, Allison L. Clouthier, Scott C.E. Brandon, Michael J. Rainbow, and Kevin J. Deluzio

The onset and progression of knee osteoarthritis have been attributed to abnormal loading of the knee joint. 1 – 3 Clinical interventions, both surgical and noninvasive, aim to reduce medial compartment knee loads. 4 – 6 Gait retraining is a noninvasive intervention in the treatment of

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Irfan A. Khan and Kelley D. Henderson

Key Points ▸ Patients with medial knee osteoarthritis experienced significantly decreased levels of pain and improved levels of function when utilizing a valgus knee brace. ▸ A combination of a valgus knee brace and other orthoses may be more effective in reducing symptoms and improving function

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Özlem Aslan, Elif Balevi Batur, and Jale Meray

Knee osteoarthritis (OA) is a degenerative disease, and it usually affects medial tibiofemoral and patellofemoral compartmants. 1 Sixty-five percent of people with knee pain over 50 years or older have OA. 2 The main symptoms of OA are pain and physical disability. 3 The pathogenesis of OA is

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Tsuyoshi Saida, Masayuki Kawada, Daijiro Kuroki, Yuki Nakai, Takasuke Miyazaki, Ryoji Kiyama, and Yasuhiro Tsuneyoshi

Knee osteoarthritis (OA) is one of the most common musculoskeletal disorders that cause knee pain and disability in the older population ( Heidari, 2011 ). Many studies have demonstrated that patients with knee OA modify their gait pattern as a strategy to alter the load on the knee joint, decrease

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Dimitrios-Sokratis Komaris, Cheral Govind, Andrew Murphy, Alistair Ewen, and Philip Riches

Movement alterations and neuromuscular adaptations in activities of daily living in patients with knee osteoarthritis are well documented. Studies have reported such changes in level walking, 1 – 3 stair ascent and descent, 4 , 5 and sit-to-stand. 6 – 12 The main reason suggested for the