TY - JOUR T1 - Compensatory strategies for muscle weakness during stair ascent in subjects with total knee arthroplasty. AU - Bjerke,Joakim, AU - Öhberg,Fredrik, AU - Nilsson,Kjell G, AU - Stensdotter,Ann K, Y1 - 2014/02/03/ PY - 2013/10/14/received PY - 2014/01/13/revised PY - 2014/01/27/accepted PY - 2014/3/12/entrez PY - 2014/3/13/pubmed PY - 2014/11/14/medline KW - electromyography KW - kinematics KW - maximal voluntary contraction KW - muscular utilization KW - stairs SP - 1499 EP - 502 JF - The Journal of arthroplasty JO - J Arthroplasty VL - 29 IS - 7 N2 - Subjects with total knee arthroplasty (TKA) exhibit decreased quadriceps and hamstring strength. This may bring about greater relative effort or compensatory strategies to reduce knee joint moments in daily activities. To study gait and map out the resource capacity, knee muscle strength was assessed by maximal voluntary concentric contractions, and whole body kinematics and root mean square (RMS) electromyography (EMG) of vastus lateralis and semitendinosus were recorded during stair ascent in 23 unilateral TKA-subjects ~19 months post-operation, and in 23 healthy controls. Muscle strength and gait velocity were lower in the TKA group, but no significant group differences were found in RMS EMG or forward trunk lean. The results suggest that reduced walking velocity sufficiently compensated for reduced knee muscle strength. SN - 1532-8406 UR - https://www.unboundmedicine.com/medline/citation/24612738/Compensatory_strategies_for_muscle_weakness_during_stair_ascent_in_subjects_with_total_knee_arthroplasty_ DB - PRIME DP - Unbound Medicine ER -