Emily S Gardinier1, Kurt Manal, Thomas S Buchanan, Lynn Snyder-Mackler. 1. Biomechanics and Movement Science Program, University of Delaware, Newark, DE, United States; Delaware Rehabilitation Institute, University of Delaware, Newark, DE, United States.
Abstract
UNLABELLED: Adequate test-retest reliability of model estimates is a necessary precursor to examining treatment effects or longitudinal changes in individuals. PURPOSE: The purpose of this study was to establish thresholds for minimal detectable change (MDC) for joint contact forces obtained using a patient specific EMG-driven musculoskeletal model of the knee. DESIGN: A sample of young, active individuals was selected for this study, and subjects were tested on 2 separate days. Three-dimensional motion analysis with electromyography (EMG) was used to obtain data from each subject during gait for model input. An EMG-driven modeling approach was used to estimate joint contact forces at each session. RESULTS: MDC's for contact force variables ranged from 0.30 to 0.66 BW. The lowest MDC was for peak medial compartment force (0.30 BW) and the highest was for peak tibiofemoral contact force (0.66 BW). Test-retest reliability coefficients were also reported for comparison with previous work. CONCLUSIONS: Using the present model, changes in joint contact forces between baseline and subsequent measurements that are greater than these MDCs are greater than typical day-to-day variation and can be identified as real change.
UNLABELLED: Adequate test-retest reliability of model estimates is a necessary precursor to examining treatment effects or longitudinal changes in individuals. PURPOSE: The purpose of this study was to establish thresholds for minimal detectable change (MDC) for joint contact forces obtained using a patient specific EMG-driven musculoskeletal model of the knee. DESIGN: A sample of young, active individuals was selected for this study, and subjects were tested on 2 separate days. Three-dimensional motion analysis with electromyography (EMG) was used to obtain data from each subject during gait for model input. An EMG-driven modeling approach was used to estimate joint contact forces at each session. RESULTS: MDC's for contact force variables ranged from 0.30 to 0.66 BW. The lowest MDC was for peak medial compartment force (0.30 BW) and the highest was for peak tibiofemoral contact force (0.66 BW). Test-retest reliability coefficients were also reported for comparison with previous work. CONCLUSIONS: Using the present model, changes in joint contact forces between baseline and subsequent measurements that are greater than these MDCs are greater than typical day-to-day variation and can be identified as real change.
Authors: Ashutosh Khandha; Kurt Manal; Jacob Capin; Elizabeth Wellsandt; Adam Marmon; Lynn Snyder-Mackler; Thomas S Buchanan Journal: J Orthop Res Date: 2018-10-09 Impact factor: 3.494
Authors: Emily S Gardinier; Stephanie Di Stasi; Kurt Manal; Thomas S Buchanan; Lynn Snyder-Mackler Journal: Am J Sports Med Date: 2014-10-15 Impact factor: 6.202
Authors: Jacob J Capin; Ashutosh Khandha; Ryan Zarzycki; Kurt Manal; Thomas S Buchanan; Lynn Snyder-Mackler Journal: J Orthop Res Date: 2016-11-18 Impact factor: 3.494
Authors: Jacob J Capin; Ashutosh Khandha; Ryan Zarzycki; Amelia J H Arundale; Melissa L Ziegler; Kurt Manal; Thomas S Buchanan; Lynn Snyder-Mackler Journal: J Orthop Res Date: 2018-04-24 Impact factor: 3.494
Authors: Ashutosh Khandha; Kurt Manal; Elizabeth Wellsandt; Jacob Capin; Lynn Snyder-Mackler; Thomas S Buchanan Journal: J Orthop Res Date: 2016-04-27 Impact factor: 3.494
Authors: Jacob J Capin; Ryan Zarzycki; Naoaki Ito; Ashutosh Khandha; Celeste Dix; Kurt Manal; Thomas S Buchanan; Lynn Snyder-Mackler Journal: J Orthop Res Date: 2019-05-20 Impact factor: 3.494
Authors: Elizabeth Wellsandt; Ashutosh Khandha; Jacob Capin; Thomas S Buchanan; Lynn Snyder-Mackler Journal: J Orthop Res Date: 2020-03-20 Impact factor: 3.494