Inter‐Session Repeatability of a Smartphone‐Based Markerless System to Measure Segment Length and Lower‐Limb Kinematics in Patients With End‐Stage Knee Osteoarthritis
Chunping Ye, Renxin Ding, Junqing Wang, Yong Nie, Kang Li · 2026
Read Inter‐Session Repeatability of a Smartphone‐Based Markerless System to Measure Segment Length and Lower‐Limb Kinematics in Patients With End‐Stage Knee Osteoarthritis by Chunping Ye, Renxin Ding, Junqing Wang, Yong Nie, Kang Li (2026) in the Tower of Babel, a free online library of public-domain works preserved in clean, searchable text. No sign-up. The full text is served as a plain-text file at a predictable URL, where text is present: https://antarctic-labs.com/tower-of-babel/pmc-13585478.txt.
Description
Chunping Ye and co-authors tested whether a phone-based motion tracker gives the same readings twice in patients with worn-out knees, in a 2026 study. The system, OpenCap, films walking with no markers or lab gear, a gentler option for people awaiting knee replacement. Twenty-three patients with end-stage knee arthritis did walking and sit-to-stand tasks in street clothes at two visits. The team compared body segment lengths and joint angle curves between the visits.
Segment lengths repeated with fair to strong agreement, and walking angles matched well, with average drift near four degrees. Standing up from a chair was shakier, near five degrees of drift and weaker agreement. Error margins for single readings ran about three degrees. The authors judge the tool fit for walking checks in clinic, but urge care with chair-rise tests until the method steadies.
Catalog record
| CREATOR | Chunping Ye, Renxin Ding, Junqing Wang, Yong Nie, Kang Li |
|---|---|
| YEAR | 2026 |
| COLLECTION | PAPERS |
| FORMAT | TXT |
| FILE SIZE | 38 KB |
| VERSION | 1.0 |
| LICENSE | CC BY 4.0 |
| RIGHTS | CC BY |
| SOURCE | Europe PMC |