Walking Distance and Interlimb Gait Differences Across 51 kg of Weight Loss After Total Knee Arthroplasty: A Three-Session Wearable Sensor Case Report.
6 affiliations
- 1Faculty of Medicine, University Evangelica of Goiás, Anápolis 75083-515, Brazil.
- 2Department of Orthopedics Surgery, Hospital Municipal de Aparecida de Goiânia (HMAP), Aparecida de Goiânia 74936-600, Brazil.
- 3Postgraduate Program in Health Sciences, Santa Casa de São Paulo School of Medical Sciences, São Paulo 01221-020, Brazil.
- 4Hospital Israelita Albert Einstein, São Paulo 05652-900, Brazil.
- 5Human Movement and Rehabilitation Post Graduation Program, University Evangelica of Goiás, Anápolis 75083-515, Brazil.
- 6Health Sciences Program, Santa Casa de São Paulo School of Medical Sciences, São Paulo 01221-020, Brazil.
Abstract
Background and Clinical Significance: Longitudinal observations that combine major postoperative weight loss with limb-specific gait assessment after total knee arthroplasty (TKA) are uncommon. This case report describes three single-trial instrumented assessments in one patient and is intended as a descriptive observation; it does not establish causality, measurement stability, mechanical loading, or a clinically meaningful persistent deficit; Case Presentation: A man in his early sixties at the first assessment had undergone left TKA for end-stage osteoarthritis and subsequently underwent Roux-en-Y gastric bypass. Three assessments were available from approximately 31 to 67 months after TKA. Body mass was 120, 88, and 69 kg (body mass index 43.03, 31.55, and 24.74 kg/m²), while two-minute walk distance (2MWT) was 67.8, 105.1, and 118.1 m. The third walk test was launched in the software's six-minute module and stopped at 1 min 58 s, so 118.1 m is the distance accumulated over 118 s and was neither adjusted nor extrapolated to 120 s. The operated limb showed longer stance duration than the non-operated limb by 3.04, 5.28, and 2.05 percentage points, and a proprietary propulsion index was lower on the operated side by 18.18%, 17.95%, and 14.06%; the direction of both differences was the same at every session but the magnitude was not, and the index has no published calculation or post-TKA interpretive threshold. Each session comprised one trial, and the third-session gait means were based on only five operated-limb and four non-operated-limb steps. Valid Timed Up and Go (TUG) totals were available for sessions 1 and 2 (13.41 and 14.95 s); the available source documentation did not contain a valid session-3 TUG result. Vendor-derived walk-test speed was excluded from primary interpretation because its calculation could not be reconciled with distance divided by test duration; Conclusions: Across these three observations, 2MWT distance increased while side-to-side differences in stance duration and the exploratory propulsion index were present at each session. These co-occurring changes cannot be attributed to weight loss specifically, because time since arthroplasty, rehabilitation exposure and repeated testing varied together with body mass. The findings are descriptive and hypothesis-generating; confirmation requires prospective studies with repeated trials per session, an adequate number of analysed steps, and validated kinetic or limb-specific outcomes.
Related
- Positive emotional responses while walking along a forest route compared with a city route: evidence from wearable facial electromyography
- Age differences in motivations, barriers, and facilitators of wearable and mobile app use in a government-led digital health initiative: a qualitative study
- Feasibility of Distributed Wearable Ultrasound for Detecting Neuromuscular Coordination Differences After Knee Injury
- Effects of wearable lower-limb robotic exoskeleton–assisted gait training on balance, walking, and activities of daily living after stroke: a systematic review and meta-analysis
- Agreement and Systematic Differences Between Intraoperative ROSA Hip-Knee-Ankle Measurements and Standing Radiographic Alignment After Robotic-Assisted Total Knee Arthroplasty: A Retrospective Agreement Study
BibTeX
@article{trindade2026walking,
title = {{Walking Distance and Interlimb Gait Differences Across 51 kg of Weight Loss After Total Knee Arthroplasty: A Three-Session Wearable Sensor Case Report.}},
author = {Andrei Machado Viegas da Trindade and Leonardo Pinheiro Rezende and Junichiro Sado Junior and Marcos Henrique Alves Resende and Claudia Santos Oliveira},
journal = {Reports (MDPI)},
year = {2026},
month = oct,
doi = {10.3390/reports9040345},
url = {https://europepmc.org/article/MED/42924796},
note = {CC BY},
}
RIS
TY - JOUR
TI - Walking Distance and Interlimb Gait Differences Across 51 kg of Weight Loss After Total Knee Arthroplasty: A Three-Session Wearable Sensor Case Report.
AU - Andrei Machado Viegas da Trindade
AU - Leonardo Pinheiro Rezende
AU - Junichiro Sado Junior
AU - Marcos Henrique Alves Resende
AU - Claudia Santos Oliveira
PY - 2026
DA - 2026/10/12
JO - Reports (MDPI)
DO - 10.3390/reports9040345
UR - https://europepmc.org/article/MED/42924796
AB - Background and Clinical Significance: Longitudinal observations that combine major postoperative weight loss with limb-specific gait assessment after total knee arthroplasty (TKA) are uncommon. This case report describes three single-trial instrumented assessments in one patient and is intended as a descriptive observation; it does not establish causality, measurement stability, mechanical loading, or a clinically meaningful persistent deficit; Case Presentation: A man in his early sixties at the first assessment had undergone left TKA for end-stage osteoarthritis and subsequently underwent Roux-en-Y gastric bypass. Three assessments were available from approximately 31 to 67 months after TKA. Body mass was 120, 88, and 69 kg (body mass index 43.03, 31.55, and 24.74 kg/m²), while two-minute walk distance (2MWT) was 67.8, 105.1, and 118.1 m. The third walk test was launched in the software's six-minute module and stopped at 1 min 58 s, so 118.1 m is the distance accumulated over 118 s and was neither adjusted nor extrapolated to 120 s. The operated limb showed longer stance duration than the non-operated limb by 3.04, 5.28, and 2.05 percentage points, and a proprietary propulsion index was lower on the operated side by 18.18%, 17.95%, and 14.06%; the direction of both differences was the same at every session but the magnitude was not, and the index has no published calculation or post-TKA interpretive threshold. Each session comprised one trial, and the third-session gait means were based on only five operated-limb and four non-operated-limb steps. Valid Timed Up and Go (TUG) totals were available for sessions 1 and 2 (13.41 and 14.95 s); the available source documentation did not contain a valid session-3 TUG result. Vendor-derived walk-test speed was excluded from primary interpretation because its calculation could not be reconciled with distance divided by test duration; Conclusions: Across these three observations, 2MWT distance increased while side-to-side differences in stance duration and the exploratory propulsion index were present at each session. These co-occurring changes cannot be attributed to weight loss specifically, because time since arthroplasty, rehabilitation exposure and repeated testing varied together with body mass. The findings are descriptive and hypothesis-generating; confirmation requires prospective studies with repeated trials per session, an adequate number of analysed steps, and validated kinetic or limb-specific outcomes.
SN - 2571-841X
ER -