Simultaneous In Vitro Measurement of Patellofemoral Kinematics and Forces

2004 ◽  
Vol 126 (3) ◽  
pp. 351-356 ◽  
Author(s):  
Amy B. Zavatsky ◽  
Paul T. Oppold ◽  
Andrew J. Price
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Motion ◽  
Leg Extension ◽  
Total Knee ◽  
Quadriceps Force ◽  
The Individual ◽  
Six Degree Of Freedom ◽  
Tibiofemoral Kinematics ◽  
Patellofemoral Kinematics

This study involved the development and testing of a system for the simultaneous in vitro measurement of tibiofemoral kinematics and patellofemoral kinematics and forces. Knee motion was tracked using a Vicon 370, and patellofemoral force was measured using a six degree-of-freedom transducer based on the design of Singerman et al. Using this system, twelve knee specimens were tested in supine leg extension under a simulated quadriceps force. The comprehensive set of results corresponds well to the individual results of previous studies. The measurement system will be of value in assessing the effects of total knee arthroplasty on patellar function.

Patellar resurfacing has minimal impact on in vitro tibiofemoral kinematics during deep knee flexion in total knee arthroplasty

The Knee ◽  
2021 ◽  
Vol 30 ◽  
pp. 163-169
Author(s):  
Kenichi Kono ◽  
Tetsuya Tomita ◽  
Takaharu Yamazaki ◽  
Keiji Iwamoto ◽  
Masashi Tamaki ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Knee Flexion ◽  
Patellar Resurfacing ◽  
Minimal Impact ◽  
Total Knee ◽  
Tibiofemoral Kinematics

Femorotibial kinematics and load patterns after total knee arthroplasty: An in vitro comparison of posterior-stabilized versus medial-stabilized design

2016 ◽  
Vol 33 ◽  
pp. 42-48 ◽  
Author(s):  
Arnd Steinbrück ◽  
Christian Schröder ◽  
Matthias Woiczinski ◽  
Andreas Fottner ◽  
Vera Pinskerova ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Posterior Stabilized ◽  
Total Knee ◽  
In Vitro Comparison

The influence of polyethylene bearing thickness on the tibiofemoral kinematics of a bicruciate retaining total knee arthroplasty

The Knee ◽  
2017 ◽  
Vol 24 (4) ◽  
pp. 751-760 ◽  
Author(s):  
Geert Peersman ◽  
Josh Slane ◽  
Margo Dirckx ◽  
Arne Vandevyver ◽  
Philipp Dworschak ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Knee Arthroplasty ◽  
Total Knee ◽  
Tibiofemoral Kinematics

scholarly journals Tranexamic Acid Increases Early Postoperative Pain and Decreases Time to First Opioid Following Total Knee Arthroplasty

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Sachin Seetharam ◽  
Sydney Keller ◽  
Mary Ziemba-Davis ◽  
R. Michael Meneghini MD
Keyword(s):  
Total Knee Arthroplasty ◽  
Postoperative Pain ◽  
Blood Loss ◽  
Tranexamic Acid ◽  
Knee Arthroplasty ◽  
Ex Vivo ◽  
Pain Scores ◽  
Average Pain ◽  
Total Knee

Background and Hypothesis: Tranexamic acid (TXA) decreases blood loss in total knee arthroplasty (TKA). However, TXA evoked pain in rats by inhibiting GABA and glycine receptors in the spinal dorsal horn, and caused cellular death in ex vivo and in vitro human periarticular tissues exposed to clinical concentrations of TXA. We evaluated inpatient postoperative pain and blood loss in TKA performed with and without TXA. Project Methods: 105 consecutive cemented TKAs without TXA were compared to 72 consecutive cemented TKAs with TXA. Procedures were performed by a single surgeon using identical perioperative medical and pain-control protocols. Outcomes included: average of q2-4 hour pain scores during the first 24 hours after PACU discharge, average pain during remainder of stay, final pain score prior to discharge, time in minutes to first opioid after PACU discharge, total opioids in morphine equivalents (MEQs) during the first 24 hours after PACU discharge, average MEQs per remaining days of stay, and mean g/dL pre- to postoperative decrease in hemoglobin. Multivariate analyses accounted for 15 demographics and covariates. Results: The sex (p=0.393), age (p=0.784), and BMI (p=0.930) of the two cohorts were similar. Mean pain during the first 24 hours was greater (4.1 vs. 3.2, p=0.001), MEQs consumed during the first 24 hours were greater (45 vs. 37, p=0.069), and time to first opioid medication was shorter (326 vs. 414, p=0.023) in patients who received TXA. The decrease in hemoglobin was less in patients who received TXA (-2.2 vs. -2.7, p<0.001).   Conclusion and Potential Impact: Our hypothesis based on animal and laboratory studies that TXA may increase early postoperative pain was confirmed by three metrics. Consistent with the effective life of TXA, pain and opioid consumption after 24 hours did not differ based on TXA use. Further work is warranted to investigate the nature consequences associated with TXA, relative to its demonstrated benefits for blood conservation.  

Continuous Passive Motion Not Affect the Knee Motion and the Surgical wound Aspect After Total Knee Arthroplasty

2021 ◽  
Author(s):  
Sergi Gil-Gonzalez ◽  
Ricardo Andrés Barja Rodriguez ◽  
Antoni Lopez Pujol ◽  
Hussein Berjaoui ◽  
Jose Enrique Fernandez Bengoa ◽  
...  
Keyword(s):  
Total Knee Arthroplasty ◽  
Range Of Motion ◽  
Knee Arthroplasty ◽  
Continuous Passive Motion ◽  
Surgical Wound ◽  
Knee Motion ◽  
Passive Motion ◽  
Significant Difference ◽  
Flexion Extension ◽  
Total Knee

Abstract Background. This study aimed to assess whether use of continuous passive motion (CPM) can improve range of motion in patients after total knee arthroplasty (TKA). Moreover, the relationship between the use of CPM with the surgical wound aspect (SWA) and pain management after TKA was analysed.Methods. We randomized 210 patients, 102 patients in the CPM group, who received a standard rehabilitation protocol together with CPM application; and 108 patients in the no-CPM group, without CPM. Variables as knee motion (flexion, extension, range of motion) and pain was measured before surgery, on the 1s, 2nd and 3rd postoperative day, and in the 2nd, 6th, 12th and 24th postoperative weeks following TKA. The SWA was determined by the “surgical wound aspect score” (SWAS) in the next 48 hours after surgery. This scale analyses swelling, erythema, haematoma, blood drainage and blisters. Results. There was an improvement in the knee motion over the course of follow-up in both groups, without significant difference in flexion parameter. We found no significant differences in the total score of SWA, except for haematoma, with less severity in the CPM group. Furthermore, we found no differences in the others SWAS parameters and pain. Conclusions. The application of CPM does not provide benefit to our patients undergoing TKA in terms of either improved flexion mobility or decreased pain. No relationship was found between the use of CPM and the global score of SWA following a TKA, except for a decrease in haematoma appearance.

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