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Rachel L. Wright, Joseph W. Bevins, David Pratt, Catherine M. Sackley and Alan M. Wing

Asymmetry in weight-bearing is a common feature in poststroke hemiparesis, with the nonparetic lower limb being favored during quiet standing. 1 , 2 This weight-bearing asymmetry remains in more dynamic tasks such as swaying, 3 standing up from a chair, 4 and walking, 5 , 6 and a reduced

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Janina M. Prado-Rico and Marcos Duarte

-6736(12)61263-X Rougier , P.R. , & Genthon , N. ( 2009 ). Dynamical assessment of weight-bearing asymmetry during upright quiet stance in humans . Gait & Posture, 29 ( 3 ), 437 – 443 . PubMed ID: 19070493 doi:10.1016/j.gaitpost.2008.11.001 10.1016/j.gaitpost.2008.11.001 Sackley , C.M. , & Lincoln , N

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

Patients with osteoarthritis of the knee commonly alter their movement to compensate for lower limb weakness and alleviate joint pain. Movement alterations may lead to weight-bearing asymmetries, and potentially to the progression of the disease. This study presents a novel numerical procedure for the identification of sit-to-walk strategies and differences in movement habits between control adults and persons with knee osteoarthritis. Ten control and 12 participants with osteoarthritis performed the sit-to-walk task in a motion capture laboratory. Participants sat on a stool with the height adjusted to 100% of their knee height, then stood and walked to pick up an object from a table in front of them. Different movement strategies were identified by means of hierarchical clustering. Trials were also classified as to whether the left and right extremities used a bilateral or an asymmetrical strategy. Participants with osteoarthritis used significantly more asymmetrical arm strategies (P = .03) while adopting the pushing through the chair strategy more often than the control subjects (P = .02). The results demonstrated that the 2 groups favor different sit-to-walk strategies. Asymmetrical arm behavior possibly indicates a compensation for the weakness of the affected leg. The proposed procedure may be useful to rapidly assess postoperative outcomes and developing rehabilitation strategies.

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P.R. Rougier, S. Berger, S. Barral and O. Rachet

To assess the postural strategies developed over the first 2 months following surgery by ACL patients during rehabilitation and highlight the sensory-motor impairment recovery, 21 patients were measured at three timeframes. Three two-legged standing conditions were assessed: with the eyes open, with the eyes closed either wearing or not wearing a knee orthosis. The results indicate that the weight-bearing asymmetry, initially observed (i.e., 56–44% of body-weight), disappeared progressively during rehabilitation (51–49%). The comparison of the plantar center-of-pressure displacements under both sound and operated legs demonstrated noticeable differences that also tended to decrease but without reaching a matched behavior during the last measures. These effects were seen in both eyes open and eyes closed conditions with the greatest effects in the latter condition. Wearing a knee orthosis inferred no particular changes in the postural control behaviors. These data could be used as benchmarks for highlighting the effects on undisturbed postural control of various surgery techniques and/or rehabilitation protocols.

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Mary Emily Littrell, Young-Hui Chang and Brian P. Selgrade

to assess balance 6 , 11 , 12 and to improve motor function for patients with Parkinson’s disease, 13 stroke, 14 amputations, 15 or multiple sclerosis. 16 More recently, researchers have used the Wii Balance Board to assess weight-bearing asymmetry during squatting 17 and sit-to-stand tasks. 18

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Yuko Kuramatsu, Yuji Yamamoto and Shin-Ichi Izumi

hemiparesis. An upright stance and STS transfer in individuals with stroke are reported to be characterized by weight-bearing asymmetry, with more weight being placed on the nonparetic limb ( Genthon et al., 2008 ; Roy et al., 2006 ). de Kam et al. ( 2017 ) reported that postural control was impaired in

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Jose Morales, Carla Ubasart, Mónica Solana-Tramunt, Israel Villarrasa-Sapiña, Luis-Millán González, David Fukuda and Emerson Franchini

inexpensive and portable dynamic weight bearing asymmetry assessment system incorporating dual Nintendo Wii balance boards . Gait Posture . 2011 ; 34 ( 2 ): 288 – 291 . PubMed ID: 21570290 doi:10.1016/j.gaitpost.2011.04.010 10.1016/j.gaitpost.2011.04.010 21570290 26. Perrot C , Mur JM , Mainard D

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Wai-Ting Lo, Kit-Lun Yick, Newman Lau, Lok-Tung Tse, Sun-Pui Ng and Joanne Yip

smoothness and stability to rise from a chair, which may contribute to a greater degree of trunk tilt and higher risks of falling. The trunk displacement in the mediolateral plane and weight-bearing asymmetry were also observed during the STS transition ( Lecours, Nadeau, Gravel, & Teixera-Salmela, 2008

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Timothy A. Hanke, Bruce Kay, Michael Turvey and David Tiberio

age on hip kinematics and kinetics . Clinical Orthopaedics and Related Research, 132 , 140 – 144 . de Kam , D. , Kamphuis , J.F. , Weerdesteyn , V. , & Geurts , A.C.H. ( 2016 ). The effect of weight-bearing asymmetry on dynamic postural stability in healthy young individuals . Gait

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Moataz Eltoukhy, Christopher Kuenze, Jeonghoon Oh, Eryn Apanovitch, Lauren Butler and Joseph F. Signorile

, Gillispie G , Marmon A , Zeni J . Validity of the Nintendo Wii Balance Board to assess weight bearing asymmetry during sit-to-stand and return-to-sit task . Gait Posture . 2015 ; 41 ( 2 ): 676 – 682 . PubMed ID: 25715680 doi:10.1016/j.gaitpost.2015.01.023 10.1016/j.gaitpost.2015.01.023 25715680