Journal of Biomechanical Science and Engineering
Online ISSN : 1880-9863
ISSN-L : 1880-9863
Development of a feedback training protocol and clinical force measuring walker for older patients with restricted upper extremity weight bearing
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2022 Volume 17 Issue 2 Pages 21-00330


Patients recovering from bone disruption due to trauma or surgery need to limit movement to minimize shear force, thereby protecting callus formation and osteogenesis. Patients often use their arms to assist with functional activities, but pushing is frequently limited to < 4.5 kg when upper body bone fracture has occurred. With only verbal instructions, patients’ ability to limit weight bearing (WB) accurately is poor. A therapeutic intervention to improve patient adherence with upper extremity (UE) WB guidelines during functional mobility using an instrumented walker could be beneficial. Therefore, the purpose this article is to describe a feedback training protocol to improve ability to modulate UE WB in older adults and then provide an overview of the efficacy of this protocol and subsequent development of a Clinical Force Measuring Walker. An instrumented walker was used to measure UE WB during functional mobility in healthy older subjects (n = 30) before, during, and after (immediately and 2 hours) practice with visual and auditory concurrent feedback training. During feedback training, force was significantly reduced after all 3 sessions as compared to baseline. When using the front wheeled walker, UE WB force during the second and third feedback training sessions went down compared to the first session. Force during the third feedback training session was greater than the two previous sessions while transferring sit-to-stand and stand-to-sit. After completion of practice with feedback, UE WB force was significantly reduced and remained so 2 hours later. These findings suggest that feedback training is effective for helping patients to modulate UE WB. Use of an instrumented walker and feedback training would be beneficial in clinical practice, especially with older patients. More intensive feedback training with additional sessions and or simultaneous visual and auditory cues during whole practice may be needed to get UE WB force below a 4.5 kg (44.5 N) threshold.

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© 2022 by The Japan Society of Mechanical Engineers

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