A Mathematical Model of Human Knee-Motion and Evaluation of Knee Endoprostheses

1987 ◽  
pp. 379-384
Author(s):  
J. Hoschek ◽  
J. Halt ◽  
G. Selvik ◽  
U. Weber
Keyword(s):  
Mathematical Model ◽  
Knee Motion ◽  
Human Knee

A mathematical model of human knee-motion and evaluation of knee endoprostheses

1987 ◽  
Vol 20 (8) ◽  
pp. 809
Author(s):  
J. Hoschek ◽  
J. Halt ◽  
G. Selvik ◽  
U. Weber
Keyword(s):  
Mathematical Model ◽  
Knee Motion ◽  
Human Knee

Study Surface Roughness and Friction of Synovial Human Knee Joint with Using Mathematical Model

2018 ◽  
Vol 00 (1) ◽  
pp. 109-118
Author(s):  
Enas Y. Abdullah ◽  
◽  
Naktal Moid Edan ◽  
Athraa N. Kadhim ◽  
◽  
...  
Keyword(s):  
Mathematical Model ◽  
Surface Roughness ◽  
Knee Joint ◽  
Human Knee ◽  
Human Knee Joint

scholarly journals A Study of Wear Articular Cartilage of Synovial Human Knee Joint Using Non-Newtonian Elastic Mathematical Model

2020 ◽  
pp. 1407-1418
Author(s):  
Enas Yahya Abdullah ◽  
Hala Khdhie
Keyword(s):  
Mathematical Model ◽  
Articular Cartilage ◽  
Knee Joint ◽  
Elastic Deformation ◽  
Knee Joints ◽  
Squeeze Film ◽  
Human Knee ◽  
Human Knee Joint ◽  
Lubrication Condition ◽  
Film Characteristics

In this paper, the wear in layers of articular cartilage was calculated, parameters effective on elastic deformation were studied in normal and diseased knee joints,   and relations between elastic deformation and squeeze film characteristics under lubrication condition  were discussed with using a mathematical model. Conferring to the results obtained, elastic deformation effects on the performance of synovial human knee joint were analyzed from medical and dynamics perspectives. Relationships between elastic deformation and wear of layers were also discussed.

On Transfemoral Prosthetic Knee Design for Natural Human Knee Motion

2020 ◽  
Vol 13 (1) ◽  
pp. 49-59
Author(s):  
Wen-Tzong Lee ◽  
Kevin Russell ◽  
Raj S. Sodhi
Keyword(s):  
Design Process ◽  
Knee Flexion ◽  
Gait Cycle ◽  
Design Method ◽  
Human Gait ◽  
Motion Generation ◽  
Knee Motion ◽  
Human Knee ◽  
Prosthetic Knee ◽  
Position Data

Background: A transfemoral prosthetic knee is an artificial knee used by above-the-knee amputees. There are two major categories of transfemoral prosthetic knee designs: pin joint-based and polycentric designs. While pin joint-based knee designs only allow pure rotation of the knee, polycentric knee designs allow a combination of rotational and translational knee motion which is exhibited in natural knee motion. Objective: This work presents both the recently-patented design process and the resulting design of a polycentric transfemoral prosthetic knee that approximates natural spatial human knee motion during flexion and extension. Methods: The design process includes tibial motion acquisition, Revolute-Revolute-Spherical-Spherical linkage (or RRSS) motion generation, RRSS linkage axode generation and circle fitting. The polycentric transfemoral prosthetic knee design produced from this process includes a gear joint with a specific spatial orientation to approximate natural spatial human knee motion. Results: Using the design process, a polycentric transfemoral prosthetic knee was designed to replicate a group of five tibial positions over 37.5° of knee flexion (the amount of knee flexion in a standard human gait cycle) with a minimal structural error. Conclusion: The circular gear-based knee design accurately replicated natural spatial knee motion over the tibial position data given for a standard human gait cycle. The knee design method must be implemented over a broader sampling of tibial position data to determine if a circular gear-based knee design is consistently accurate.

Automatic segmentation algorithms and personalized geometric modelling for a human knee

2019 ◽  
Vol 34 (6) ◽  
pp. 361-367
Author(s):  
Victoria Yu. Salamatova ◽  
Alexandra S. Yurova ◽  
Yuri V. Vassilevski ◽  
Lin Wang
Keyword(s):  
Mathematical Model ◽  
Diagnostic Procedure ◽  
Automatic Segmentation ◽  
Patient Specific ◽  
Geometric Representation ◽  
Anatomical Features ◽  
Human Knee ◽  
Attachment Sites ◽  
Segmentation Algorithms ◽  
Surgery Outcomes

Abstract Human knee is one of the most complex joints. Different reasons may lead to knee instability. A personalized mathematical model of the knee may improve both diagnostic procedure and knee surgery outcomes. Such models require accurate geometric representation of bones and attachment sites of ligaments and tendons. This paper addresses automatic segmentation of knee bones and detection of origins and insertions for tendons and ligaments. The approach is based on anatomical features of bones and landmarks of tendons/ligaments attachments on the CT images. It provides a tool for the design of patient-specific geometrical knee models.

Lightweight Piezoelectric Bending Beam-based Energy Harvester for Capturing Energy from Human Knee Motion

2021 ◽  
pp. 1-1
Author(s):  
Fei Gao ◽  
Gaoyu Liu ◽  
Xinlei Fu ◽  
Liang Li ◽  
Wei-Hsin Liao
Keyword(s):  
Energy Harvester ◽  
Knee Motion ◽  
Human Knee

The accuracy of knee motion obtained with different dynamic models of human knee joint

1998 ◽  
Vol 7 (2) ◽  
pp. 161
Author(s):  
Maria K. Lebiedowska ◽  
Richard B. Stein
Keyword(s):  
Knee Joint ◽  
Dynamic Models ◽  
Knee Motion ◽  
Human Knee ◽  
Human Knee Joint

A Method for Optimal Synthesis of a Biomimetic Four-Bar Linkage Knee Joint for a Knee-Ankle-Foot Orthosis

2017 ◽  
Vol 32 ◽  
pp. 20-28 ◽  
Author(s):  
Ganesh M. Bapat ◽  
S. Sujatha
Keyword(s):  
Knee Joint ◽  
Optimal Synthesis ◽  
Average Error ◽  
Optimization Approach ◽  
Knee Motion ◽  
Human Knee ◽  
Ankle Foot Orthosis ◽  
Flexion Extension ◽  
Four Bar Linkage ◽  
Foot Orthosis

A Knee-Ankle-Foot orthosis (KAFO) is used as a supportive device by individuals with lower limb disability. A type of KAFO that allows knee flexion-extension is prescribed for people who need knee stability in the transverse and frontal planes. In such an orthosis, mimicking the human knee motion is vital to avoid relative motion (called pistoning) between the limb and the orthosis. A four-bar mechanism, owing to its polycentric nature, simplicity and ease of fabrication can provide a customizable, biomimetic solution. This paper presents an improved and robust optimization approach to synthesize a four-bar mechanism to closely mimic the anatomical knee motion. The reference human knee centrode is obtained from literature. A genetic algorithm is used for optimal synthesis of the fourbar mechanism. Results show that the average error between the reference centrode and the centrode of the synthesized four-bar mechanism is very small (0.2 mm). Thus, the synthesized crossed four-bar linkage can reproduce better anthropomorphic characteristics of the knee joint. The methodology can be used for the design of customized orthotic knee joints for KAFOs and knee braces.

Mathematical model of hit phenomena and its application to movie advertisement

2008 ◽  
Author(s):  
Ishii Akira ◽  
Yoshida Narihiko ◽  
Hayashi Takafumi ◽  
Umemura Sanae ◽  
Nakagawa Takeshi
Keyword(s):  
Mathematical Model
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