Moment arm of the patellar tendon in the human knee

2004 ◽  
Vol 37 (5) ◽  
pp. 785-788 ◽  
Author(s):  
Janet L. Krevolin ◽  
Marcus G. Pandy ◽  
John C. Pearce
2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Miyuki Hori ◽  
Tadashi Suga ◽  
Masafumi Terada ◽  
Yuto Miyake ◽  
Akinori Nagano ◽  
...  
Keyword(s):  

2018 ◽  
Vol 6 (12) ◽  
pp. 232596711881603 ◽  
Author(s):  
Michael J. Dan ◽  
James McMahon ◽  
William C.H. Parr ◽  
David Broe ◽  
Phil Lucas ◽  
...  

Background: Patellar tendinopathy is an overuse condition often affecting athletes. It has been postulated that patellar tendinopathy is associated with patella alta; however, this and any other anatomic risk factors have not been identified. Purpose: To explore whether lever arm differences from radiographic measurements exist between patients with and without tendinopathy. This may provide surgeons with a simple radiographic means to identify patients at risk. Study Design: Cross-sectional study; Level of evidence, 3. Methods: Magnetic resonance imaging scans of the knee from a sports imaging facility were screened and reviewed to identify 2 groups of patients: those with and those without imaging signs of patellar tendinopathy. The lateral radiographs were reviewed and measurements made to determine (1) lever arm ratio, (2) moment arm ratio, (3) angle between the moment and line of pull of the patellar tendon, (4) patellar tendon pivot point angle, and (5) patellar height (alta). Measurements were obtained directly from radiographs. The images and measurements were reviewed by 2 experienced orthopaedic clinicians. Results: A total of 105 patients were included in this study: 52 with patellar tendinopathy and 53 without patellar tendinopathy (controls). The mean age was similar between groups (23 years); females accounted for 8 of 52 patients with patellar tendinopathy and 24 of 53 patients without. The lever arm ratio in the group with patellar tendinopathy versus controls was 1.71 versus 1.01 ( P = .01), with a moment arm difference of 1.00 versus 0.80 ( P < .01), respectively. There was no difference detected between groups for patellar tendon angle, patellar tendon pivot point angle, knee flexion angle, or incidence of patella alta. No correlation was found with our measurements and the Insall-Salvati ratio. Statistical analysis was also performed according to sex, and a statistically significant difference between groups was found for differences in lever arm ratio and moment arm. Conclusion: The lever arm ratio and moment arm ratio from lateral radiographs were significantly different between patients with and without patellar tendinopathy. Further study is needed on the biomechanical implications of the pivot point and how altering it can affect stress within the patellar tendon, patellofemoral joint, and associated clinical outcomes.


2009 ◽  
Vol 105 (5) ◽  
pp. 809-814 ◽  
Author(s):  
Dimitrios E. Tsaopoulos ◽  
Vasilios Baltzopoulos ◽  
Paula J. Richards ◽  
Constantinos N. Maganaris

2007 ◽  
Vol 40 (15) ◽  
pp. 3325-3332 ◽  
Author(s):  
Dimitrios E. Tsaopoulos ◽  
Vasilios Baltzopoulos ◽  
Paula J. Richards ◽  
Constantinos N. Maganaris

Author(s):  
Oliver Dandridge ◽  
Amy Garner ◽  
Andrew A. Amis ◽  
Justin P. Cobb ◽  
Richard J. Arkel

The Knee ◽  
2012 ◽  
Vol 19 (5) ◽  
pp. 564-570 ◽  
Author(s):  
T.R. Ward ◽  
H. Pandit ◽  
D. Hollinghurst ◽  
P. Moolgavkar ◽  
A.B. Zavatsky ◽  
...  

2014 ◽  
Vol 47 (6) ◽  
pp. 1294-1298 ◽  
Author(s):  
Robert M. Erskine ◽  
Christopher I. Morse ◽  
Stephen H. Day ◽  
Alun G. Williams ◽  
Gladys L. Onambele-Pearson
Keyword(s):  

2007 ◽  
Vol 40 (3) ◽  
pp. 645-651 ◽  
Author(s):  
Dimitrios E. Tsaopoulos ◽  
Constantinos N. Maganaris ◽  
Vasilios Baltzopoulos

2006 ◽  
Vol 21 (7) ◽  
pp. 657-667 ◽  
Author(s):  
Dimitrios E. Tsaopoulos ◽  
Vasilios Baltzopoulos ◽  
Constantinos N. Maganaris

2019 ◽  
Vol 9 (20) ◽  
pp. 4301 ◽  
Author(s):  
Jianping Wang ◽  
Yongqiang Yang ◽  
Dong Guo ◽  
Shihua Wang ◽  
Long Fu ◽  
...  

Objectives: This paper studies the patellar tendon release’s effect on the movement characteristics of the artificial patellofemoral joint squat to provide reference data for knee joint surgery. Methods: Firstly, the dynamic finite element model of the human knee joint under squatting was established. Secondly, in the above no-release models, the release of 30% of the attachment area at the upper end, the lower end, or both ends of the patellar tendon were conducted, respectively. Then the simulations of all above four models were conducted. Finally, the results of the simulation were compared and analyzed. Results: The simulation results show that, after releasing the patellar tendon (compared with the no-release simulation’s results), the relative flexion, medial-lateral rotation, medial-lateral tilt, and superior-inferior shift of the patella relative to the femur increased; the medial-lateral shift and anterior-posterior shift of the patella relative to the femur decreased. Conclusion: In this paper, the maximum flexion angle of the patella increased after the patellar tendon being released (compared with the no-release model), which indicated that the mobility of knee joint was improved after the patellar tendon release. The simulation data in this paper can provide technical reference for total knee arthroplasty.


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