Loading...
Search for:
knee-function
0.006 seconds
Rehabilitation after ACL injury: A fluoroscopic study on the effects of type of exercise on the knee sagittal plane arthrokinematics
, Article BioMed Research International ; Volume 2013 , July , 2013 ; 23146133 (ISSN) ; Esfandiarpour, F ; Shakourirad, A ; Salehi, R ; Akbar, M ; Farahmand, F ; Sharif University of Technology
2013
Abstract
A safe rehabilitation exercise for anterior cruciate ligament (ACL) injuries needs to be compatible with the normal knee arthrokinematics to avoid abnormal loading on the joint structures. The objective of this study was to measure the amount of the anterior tibial translation (ATT) of the ACL-deficient knees during selective open and closed kinetic chain exercises. The intact and injured knees of fourteen male subjects with unilateral ACL injury were imaged using uniplanar fluoroscopy, while the subjects performed forward lunge and unloaded/loaded open kinetic knee extension exercises. The ATTs were measured from fluoroscopic images, as the distance between the tibial and femoral reference...
Effects of prosthetic mass distribution on the spatiotemporal characteristics and knee kinematics of transfemoral amputee locomotion
, Article Gait and Posture ; Volume 37, Issue 1 , 2013 , Pages 78-81 ; 09666362 (ISSN) ; Farahmand, F ; Ebrahimi, I ; Sharif University of Technology
2013
Abstract
This study was designed to investigate the effect of changing the location of the center of mass (COM) of transfemoral prostheses on the spatiotemporal and kinematical characteristics of the amputee gait, while maintaining the prosthetic mass fixed. Ten men with unilateral traumatic transfemoral amputation participated in gait analysis, 2-min walk and subject preference tests. Weights were added to the original prosthetic legs in three conditions: 600. g added to the ankle, 600. g added at 10. cm distal to the prosthetic knee, and 300. g added to the ankle, and 300. g at 10. cm distal to the knee. For each prosthetic mass condition, the stride and step lengths, stepping speed, stance, swing...
Diagnosing anterior cruciate ligament injuries using a knee arthrometer: Design, fabrication, and clinical evaluation
, Article Biomedical Engineering - Applications, Basis and Communications ; Volume 23, Issue 3 , April , 2011 , Pages 181-192 ; 10162372 (ISSN) ; Sahraei, E ; Shirin, M. B ; Farahmand, F ; Tahmasebi, M. N ; Parnianpour, M ; Sharif University of Technology
2011
Abstract
Every year many people suffer from knee injuries. Previous studies on patients with knee injuries have shown that about 40% of knee injuries are Ligament injuries, and about 50% of the ligament injuries are the Anterior Cruciate Ligament (ACL) injuries. Along with other methods, knee arthrometers are widely used to diagnose ACL injuries. In the current research, a knee arthrometer was designed and developed to provide a reliable and repeatable measurement of knee laxity under anteriorposterior applied loads. Testretest configurations to examine repeatability of the device resulted in less than 1.5-mm difference for more than 97% of tests under applied loads of up to 90 N. These tests...
Electromyographic analysis of anterior cruciate deficient knees with and without functional bracing during lunge exercise
, Article Prosthetics and Orthotics International ; Volume 40, Issue 2 , 2016 , Pages 270-276 ; 03093646 (ISSN) ; Farahmand, F ; Rezaeian, T ; Ramsey, D. K ; Mousavi, S. M. E ; Sharif University of Technology
SAGE Publications Inc
2016
Abstract
Background: The use of functional knee braces for returning to sports or during demanding activities following anterior cruciate ligament rupture is common; yet despite being commonly prescribed, its mechanism of action remains unknown. Objectives: To examine the effect of functional knee braces on mean muscle activity when performing lunge exercises. Study design: Pre-/post-test (within-subject research design). Methods: A total of 10 male participants with unilateral isolated anterior cruciate ligament deficiency participated. Electromyographic activities of six muscles around the knee were recorded during lunge exercises, with and without wearing a custom functional knee brace. The lunge...
The gait and energy efficiency of stance control knee-ankle-foot orthoses: A literature review
, Article Prosthetics and Orthotics International ; Volume 40, Issue 2 , 2016 , Pages 202-214 ; 03093646 (ISSN) ; Bahramizadeh, M ; Arazpour, M ; Samadian, M ; Hutchins, S. W ; Farahmand, F ; Mardani, M. A ; Sharif University of Technology
SAGE Publications Inc
2016
Abstract
Background: The use of knee-ankle-foot orthoses with drop locked knee joints produces some limitations for walking in subjects with quadriceps muscle weakness. The development of stance control orthoses can potentially improve their functionality. Objectives: The aim of this review was to compare the evidence of the effect of stance control orthoses to knee-ankle-foot orthoses with drop locked knee joints in improving kinematic variables and energy efficiency of walking by subjects with quadriceps muscle weakness caused by different pathologies. Study design: Literature review. Methods: Based on selected keywords and their composition, a search was performed in Google Scholar, PubMed,...
P 134 – Absence of the patella has minimal effects on sagittal plane gait parameters
, Article Gait and Posture ; Volume 65 , 2018 , Pages 462-464 ; 09666362 (ISSN) ; Khandan, A ; Arab Baniasad, M ; Darbandi, H ; Vafaei, A. R ; Sharif University of Technology
Elsevier B.V
2018
Abstract
Patella is the latest addition to the animal's skeleton. It's role in normal walking has not been clearly defined. A 9-year-old girl with congenital absence of the patella was assessed using instrumented gait analysis. The results show a tendency for the limb for external rotation, which is more pronounced during swing. We suggest that the role of the patella is mainly to redirect the force of the quadriceps tendon medially. The classically described role, which is to increase the lever arm of the quadriceps tendon, was not confirmed in this study. © 2018 Elsevier B.V
Biomechanical analysis of the pelvis angular excursion in sagittal plane in response to asymmetric leg loading tasks in females with and without nonspecific chronic low back pain
, Article Journal of Biomedical Physics and Engineering ; Volume 11, Issue 3 , 2021 , Pages 367-376 ; 22517200 (ISSN) ; Kamali, F ; Parni Anpour, M ; Davoudi, M ; Sharif University of Technology
Shriaz University of Medical Sciences
2021
Abstract
Background: Controlling pelvic excursions is the focus of stabilization exercises such as legs loading tasks in rehabilitation of non-specific chronic low back pain (NSCLBP) patients. Progression of these exercises is based on the ability to perform tasks with minimal sagittal pelvic excursions. In spite of emphasis on minimizing pelvic motions, no previous studies have investigated kinematic analysis of the pelvic excursions during leg loading exercises in NSCLBP patients. Objective: This study aims to investigate the sagittal pelvis excursion during performing asymmetric leg loading tasks in individuals with and without NSCLBP. Material and Methods: In this cross-sectional study, kinematic...
Trunk, pelvis, and knee kinematics during running in females with and without patellofemoral pain
, Article Gait and Posture ; Volume 89 , 2021 , Pages 80-85 ; 09666362 (ISSN) ; Ebrahimi, S ; Rezaie, M ; Shafiee, E ; Shokouhyan, S. M ; Motealleh, A ; Parnianpour, M ; Sharif University of Technology
Elsevier B.V
2021
Abstract
Background: Females are two times more likely to develop patellofemoral pain (PFP) than males. Abnormal trunk and pelvis kinematics are thought to contribute to the pathomechanics of this condition. However, there is a scarcity of evidence investigating proximal segments kinematics in females with PFP. Research question: The purpose of this study was to investigate whether females with PFP demonstrate altered trunk, pelvis, and knee joint kinematics compared with healthy controls during running. Methods: Thirty-four females (17 PFP, 17 controls) underwent a 3-dimensional motion analysis during treadmill running at preferred and fixed speeds, each trial for 30 s. Variables of interest...
Comparison of kinematics of ACL-deficient and healthy knees during passive flexion and isometric leg press
, Article Knee ; Volume 20, Issue 6 , December , 2013 , Pages 505-510 ; 09680160 (ISSN) ; Shakourirad, A ; Talebian Moghaddam, S ; Olyaei, G ; Eslami, A ; Farahmand, F ; Sharif University of Technology
Abstract
Background: Studying the kinematics of the ACL deficient (ACLD) knees, during different physiological activities and muscle contraction patterns, can improve our understanding of the joint's altered biomechanics due to ACL deficiency as well as the efficacy and safety of the rehabilitations exercises. Methods: Twenty-five male volunteers, including 11 normal and 14 unilateral ACLD subjects, participated in this study. The kinematics of the injured knees of the ACLD subjects was compared with their intact knees and the healthy group during passive flexion and isometric leg press with the knees flexed from full extension to 45° flexion, with 15° intervals. An accurate registration algorithm...
Mechanical characterization of the ligaments in subject-specific models of the patellofemoral joint using in vivo laxity tests
, Article Knee ; Volume 26, Issue 6 , 2019 , Pages 1220-1233 ; 09680160 (ISSN) ; Farahmand, F ; Arjmand, N ; Sharif University of Technology
Elsevier B.V
2019
Abstract
Background: The purpose of this study was to propose a methodology for mechanical characterization of the ligaments in subject-specific models of the patellofemoral joint (PFJ) of living individuals. Method: PFJ laxity tests were performed on a healthy volunteer using a specially designed loading apparatus under biplane fluoroscopy. A three-dimensional (3D) parametric model of the PFJ was developed in the framework of the rigid body spring model using the geometrical data acquired from the subject's computed tomography and magnetic resonance images. The stiffness and pre-strains of the medial and lateral PFJ ligaments were characterized using a two-step optimization procedure which minimized...
A detailed and validated three dimensional dynamic model of the patellofemoral joint
, Article Journal of Biomechanical Engineering ; Volume 134, Issue 4 , 2012 ; 01480731 (ISSN) ; Farahmand, F ; Jafari, A ; Foumani, M. S ; Sharif University of Technology
2012
Abstract
A detailed 3D anatomical model of the patellofemoral joint was developed to study the tracking, force, contact and stability characteristics of the joint. The quadriceps was considered to include six components represented by 15 force vectors. The patellar tendon was modeled using four bundles of viscoelastic tensile elements. Each of the lateral and medial retinaculum was modeled by a three-bundle nonlinear spring. The femur and patella were considered as rigid bodies with their articular cartilage layers represented by an isotropic viscoelastic material. The geometrical and tracking data needed for model simulation, as well as validation of its results, were obtained from an in vivo...