COMPARISON OF A MUSCULOSKELETAL SHOULDER MODEL WITH IN-VIVO JOINT FORCES

2007 ◽  
Vol 40 ◽  
pp. S67 ◽  
Author(s):  
John Rasmussen ◽  
Mark de Zee ◽  
Søren Tørholm ◽  
Michael Damsgaard
Keyword(s):  
Joint Forces

IN VIVO SHOULDER JOINT FORCES AT ISOLATED MOTIONS

2008 ◽  
Vol 41 ◽  
pp. S144 ◽  
Author(s):  
Peter Westerhoff ◽  
Antonius Rohlmann ◽  
A. Bender ◽  
Friedmar Graichen ◽  
Georg Bergmann
Keyword(s):  
Shoulder Joint ◽  
Joint Forces

scholarly journals Effect of Perturbing a Simulated Motion on Knee and Anterior Cruciate Ligament Kinetics

2012 ◽  
Vol 134 (10) ◽  
Author(s):  
Safa T. Herfat ◽  
Daniel V. Boguszewski ◽  
Rebecca J. Nesbitt ◽  
Jason T. Shearn
Keyword(s):  
Anterior Cruciate Ligament ◽  
Cruciate Ligament ◽  
Degree Of Freedom ◽  
Joint Kinetics ◽  
Motion Measurement ◽  
Joint Forces ◽  
Anterior Cruciate ◽  
Intact Knee

Current surgical treatments for common knee injuries do not restore the normal biomechanics. Among other factors, the abnormal biomechanics increases the susceptibility to the early onset of osteoarthritis. In pursuit of improving long term outcome, investigators must understand normal knee kinematics and corresponding joint and anterior cruciate ligament (ACL) kinetics during the activities of daily living. Our long term research goal is to measure in vivo joint motions for the ovine stifle model and later simulate these motions with a 6 degree of freedom (DOF) robot to measure the corresponding 3D kinetics of the knee and ACL-only joint. Unfortunately, the motion measurement and motion simulation technologies used for our project have associated errors. The objective of this study was to determine how motion measurement and motion recreation error affect knee and ACL-only joint kinetics by perturbing a simulated in vivo motion in each DOF and measuring the corresponding intact knee and ACL-only joint forces and moments. The normal starting position for the motion was perturbed in each degree of freedom by four levels (−0.50, −0.25, 0.25, and 0.50 mm or degrees). Only translational perturbations significantly affected the intact knee and ACL-only joint kinetics. The compression-distraction perturbation had the largest effect on intact knee forces and the anterior-posterior perturbation had the largest effect on the ACL forces. Small translational perturbations can significantly alter intact knee and ACL-only joint forces. Thus, translational motion measurement errors must be reduced to provide a more accurate representation of the intact knee and ACL kinetics. To account for the remaining motion measurement and recreation errors, an envelope of forces and moments should be reported. These force and moment ranges will provide valuable functional tissue engineering parameters (FTEPs) that can be used to design more effective ACL treatments.

Five month in vivo measurement of hip joint forces

1989 ◽  
Vol 22 (10) ◽  
pp. 986 ◽  
Author(s):  
G. Bergmann ◽  
F. Graichen ◽  
A. Rohlmann
Keyword(s):  
Hip Joint ◽  
In Vivo Measurement ◽  
Joint Forces

Ligament Property Optimization Within a Virtual Biomechanical Knee

2008 ◽  
Author(s):  
Jeffrey E. Bischoff ◽  
Eik Siggelkow ◽  
Daniel Sieber ◽  
Mariana Kersh ◽  
Heidi Ploeg ◽  
...  
Keyword(s):  
Material Model ◽  
Specific Model ◽  
Design Tool ◽  
Implant Design ◽  
Orthopaedic Implant ◽  
Knee Mechanics ◽  
Joint Forces ◽  
Specific Material

Specimen-specific modeling of the knee can be an effective tool for understanding knee mechanics [1–2]. It can also serve as a design tool for orthopaedic implant design through enhancing understanding of mechanics in the reconstructed knee [3], particularly when used in conjunction with instrumented components that record in vivo joint forces [4]. Techniques for developing specimen-specific computational geometric models of hard tissue and soft tissue are fairly commonplace, using imaging tools such as computed tomography (CT) and magnetic resonance (MR) in conjunction with software tools for image processing. Determination of specimen-specific material properties relies on measuring kinematics of the tissue associated with a defined load, either in vivo or in vitro, selecting an appropriate material model, and estimating values of the parameters of the model that closely match the experimental data. The goal of this work was to utilize inverse finite element (FE) analysis to determine material parameters of ligaments in a specimen-specific model of the knee, using both local and global optimization algorithms.

In Vivo Hip Joint Forces Recorded on a Strain Gauged ‘English’ Prosthesis Using an Implanted Transmitter

1981 ◽  
Vol 10 (4) ◽  
pp. 175-187 ◽  
Author(s):  
M Kilvington ◽  
R M F Goodman
Keyword(s):  
Hip Joint ◽  
Single Channel ◽  
Peak Load ◽  
Stair Climbing ◽  
Processing Unit ◽  
Hip Joint Replacement ◽  
Fm Radio ◽  
Joint Forces ◽  
Implanted Transmitter

This paper describes the results obtained from implanting a strain gauged version of an ‘English’ hip joint replacement together with a totally implantable FM radio transmitter. The implant is based upon a new concept in the design of femoral hip components having a diminished head offset to reduce head load and improved stem shape permitting alignment of the neck along the theoretical axis of peak load transmitted during the gait cycle. The implant was inserted using the ‘English’ trochanteric approach (English, 1975) which further reduces the load on a prosthetic hip joint with the use of a spacer out from the redundant femoral head to rearrange the trochanteric muscle lever arms. The resulting axial load is detected by four strain gauges mounted on a ‘piston in cylinder’ arrangement contained within the thickened neck of the prosthesis. The single channel FM transmitter relays the gauge output to a signal processing unit to give a direct output of activity for recording on a UV recorder. Recordings were taken during implantation, recovery, walking (at three days) physiotherapy, stair climbing and walking over a period of forty days.

Effect of ACL graft material on joint forces during a simulated in vivo motion in the porcine knee: Examining force during the initial cycles

2014 ◽  
Vol 32 (11) ◽  
pp. 1458-1463 ◽  
Author(s):  
Daniel V. Boguszewski ◽  
Christopher T. Wagner ◽  
David L. Butler ◽  
Jason T. Shearn
Keyword(s):  
Graft Material ◽  
Acl Graft ◽  
Joint Forces ◽  
Porcine Knee

Intact Knee and ACL Forces for the Human and Ovine Model During Simulated In Vivo Human and In Vivo Ovine Motions

2011 ◽  
Author(s):  
Safa T. Herfat ◽  
Daniel V. Boguszewski ◽  
Jason T. Shearn
Keyword(s):  
Animal Model ◽  
Knee Joint ◽  
Daily Living ◽  
Knee Injuries ◽  
Joint Degeneration ◽  
Ovine Model ◽  
Joint Forces ◽  
Intact Knee

Patients frequently experience knee injuries, with the ACL being one of the most commonly injured structures requiring surgery [1]. ACL tears typically lead to osteoarthritis in the long term, even after surgical treatment [2]. This chronic joint degeneration has been attributed to the failure of current ACL reconstructions to restore the native biomechanics of the knee joint [3]. To design more effective treatments, investigators must first understand normal knee function for multiple activities of daily living (ADLs). The 3D in vivo forces and moments of the normal intact knee, as well as those for just the ACL have not yet been determined for any ADL. These in vivo forces and moments can potentially be measured for multiple ADLs in an animal model. A biomechanical surrogate allows for 1) sensors or marker systems to be rigidly fixed to the knee joint to accurately measure the 6 degree of freedom (DOF) kinematics, and for 2) the kinematics to be simulated and applied to the harvested limb to measure the corresponding joint forces and moments.

scholarly journals A Critical Analysis of TKR In Vitro Wear Tests Considering Predicted Knee Joint Loads

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1597 ◽  
Author(s):  
Saverio Affatato ◽  
Alessandro Ruggiero
Keyword(s):  
Knee Joint ◽  
Detailed Knowledge ◽  
Musculoskeletal Modelling ◽  
Assessment Protocol ◽  
Joint Forces ◽  
Joint Reaction Forces ◽  
Reaction Forces ◽  
Wear Tests

Detailed knowledge about loading of the knee joint is essential for preclinical testing of total knee replacement. Direct measurement of joint reaction forces is generally not feasible in a clinical setting; non-invasive methods based on musculoskeletal modelling should therefore be considered as a valid alternative to the standards guidelines. The aim of this paper is to investigate the possibility of using knee joint forces calculated through musculoskeletal modelling software for developing an in vitro wear assessment protocol by using a knee wear simulator. In particular, in this work we preliminarily show a comparison of the predicted knee joint forces (in silico) during the gait with those obtained from the ISO 14243-1/3 and with those measured in vivo by other authors. Subsequently, we compare the wear results obtained from a knee wear joint simulator loaded by calculated forces in correspondence to the “normal gait” kinematics with those obtained in correspondence to the loads imposed by the ISO. The obtained results show that even if the predicted load profiles are not totally in good agreement with the loads deriving from ISO standards and from in vivo measurements, they can be useful for in vitro wear tests, since the results obtained from the simulator in terms of wear are in agreement with the literature data.

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