scholarly journals Accuracy of Measuring Knee Flexion after TKA through Wearable IMU Sensors

2021 ◽  
Vol 6 (3) ◽  
pp. 60
Author(s):  
Ricardo Antunes ◽  
Paul Jacob ◽  
Andrew Meyer ◽  
Michael A. Conditt ◽  
Martin W. Roche ◽  
...  

Wearable sensors have the potential to facilitate remote monitoring for patients recovering from knee replacement surgery. Using IMU sensors attached to the patients’ leg, knee flexion can be monitored while the patients are recovering in their home environment. Ideally, these flexion angle measurements will have an accuracy and repeatability at least on par with current clinical standards. To validate the clinical accuracy of a two-sensor IMU system, knee flexion angles were measured in eight subjects post-TKA and compared with other in-clinic angle measurement techniques. These sensors are aligned to the patients’ anatomy by taking a pose resting their operated leg on a box; an initial goniometer measurement defines the patients’ knee flexion while taking that pose. The repeatability and accuracy of the system was subsequently evaluated by comparing knee flexion angles against goniometer readings and markerless optical motion capture data. The alignment pose was repeatable with a mean absolute error of 1.6 degrees. The sensor accuracy through the range of motion had a mean absolute error of 2.6 degrees. In conclusion, the presented sensor system facilitates a repeatable and accurate measurement of the knee flexion, holding the potential for effective remote monitoring of patients recovering from knee replacement surgery.

2014 ◽  
Vol 120 (4) ◽  
pp. 852-860 ◽  
Author(s):  
Cynthia So-Osman ◽  
Rob G. H. H. Nelissen ◽  
Ankie W. M. M. Koopman-van Gemert ◽  
Ewoud Kluyver ◽  
Ruud G. Pöll ◽  
...  

Abstract Background: Patient blood management is introduced as a new concept that involves the combined use of transfusion alternatives. In elective adult total hip- or knee-replacement surgery patients, the authors conducted a large randomized study on the integrated use of erythropoietin, cell saver, and/or postoperative drain reinfusion devices (DRAIN) to evaluate allogeneic erythrocyte use, while applying a restrictive transfusion threshold. Patients with a preoperative hemoglobin level greater than 13 g/dl were ineligible for erythropoietin and evaluated for the effect of autologous blood reinfusion. Methods: Patients were randomized between autologous reinfusion by cell saver or DRAIN or no blood salvage device. Primary outcomes were mean intra- and postoperative erythrocyte use and proportion of transfused patients (transfusion rate). Secondary outcome was cost-effectiveness. Results: In 1,759 evaluated total hip- and knee-replacement surgery patients, the mean erythrocyte use was 0.19 (SD, 0.9) erythrocyte units/patient in the autologous group (n = 1,061) and 0.22 (0.9) erythrocyte units/patient in the control group (n = 698) (P = 0.64). The transfusion rate was 7.7% in the autologous group compared with 8.3% in the control group (P = 0.19). No difference in erythrocyte use was found between cell saver and DRAIN groups. Costs were increased by €298 per patient (95% CI, 76 to 520). Conclusion: In patients with preoperative hemoglobin levels greater than 13 g/dl, autologous intra- and postoperative blood salvage devices were not effective as transfusion alternatives: use of these devices did not reduce erythrocyte use and increased costs.


2004 ◽  
Vol 51 (1) ◽  
pp. 110-116 ◽  
Author(s):  
Joe Feinglass ◽  
Hagay Amir ◽  
Patricia Taylor ◽  
Ithai Lurie ◽  
Larry M. Manheim ◽  
...  

2010 ◽  
Vol 2 (2) ◽  
pp. 3483-3488 ◽  
Author(s):  
Hamed Sabri ◽  
Brent Cowan ◽  
Bill Kapralos ◽  
Mark Porte ◽  
David Backstein ◽  
...  

2016 ◽  
Vol 68 (4) ◽  
pp. 463-471 ◽  
Author(s):  
Genevieve Fleeton ◽  
Alison R. Harmer ◽  
Lillias Nairn ◽  
Jack Crosbie ◽  
Lyn March ◽  
...  

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