The Accuracy and Validity of Modus Trex Activity Monitor in Determining Functional Level in Veterans with Transtibial Amputations

This study was a prospective study monitoring walking behavior. Subjects were recruited from an outpatient clinic for persons with amputation at a Veterans Affairs medical center. Subjects were blinded to results of the Global Positioning System and activity data. Physicians were blinded to Modus Trex–derived K-level, 6-minute walk test (6MWT), and Amputee Mobility Predictor with Prosthesis (AMPPRO) results. The study enrolled 29 subjects with transtibial amputation. Twenty-seven subjects were included in the data analysis. Two subjects were excluded due to incomplete or unreliable data. Patients were eligible if they were at least 1 year postamputation surgery and could walk with a well-fitting and functioning prosthesis. Patients were excluded if they had other musculoskeletal injuries that impacted their ambulation ability. A clinical K-level, 6MWT, and AMPPRO were obtained. An activity monitor and Global Positioning System device were attached to the prosthesis to record activity for 2 weeks. Study physicians used number of steps in community, steps per day, peak cadence, and environmental barriers traversed in the subjects' first 6 to 10 days, as well as clinical judgement, to determine a Modified Clinical K-level (MCK-level) for each subject. The MCK-level was the criterion to which all other measures were compared. Results The Modus Trex–derived K-level correlated most strongly with the MCK-levels (r = 0.96, P
Source: JPO Journal of Prosthetics and Orthotics - Category: Orthopaedics Tags: Original Research Articles Source Type: research