Kinetic and kinematic characteristics of gait in patients with medial knee arthrosis

This paper discusses the kinematic characteristics of lapping process and the main parameters of the process. It was determined that the influencing degree of technological parameters to the forming surface and processes. It was projected the construction of the lapping head for processing of internal cylindrical surfaces, scheme of the lapping operation and graphic description of the forces influencing. The relationships between the axial, radial and tangential cutting forces and the effect of the combined force thereof are determined in order to ensure the necessary surface pressure. During the analysis geometric and mathematical relationships were obtained. The extracted analytical expressions can be realized by further experimental researches and can be used in engineering calculations of technological parameters of processing by lapping. Angular velocity, friction force, linear velocity, also the length of the tactile curve and the radius of the part can be considered the main kinematic and dynamic parameters of the process that the formation of the surface, also the course of the process depends on these parameters. Depending on the kinematic parameters, the wear nature of the tool changes and this changes the linear and angular velocities, which have a significant impact on the accuracy, quality and productivity of processing. When examining the technological capabilities of the process, the nature of the movement between the part and the grinding tool, also changes in cutting speed are often considered as a main factor. Analytical expressions were obtained to determine the main parameters of the process, taking into account the kinematic characteristics of the friction process. These expressions can be used in engineering calculations and allow to determine the optimal values of the processing mode. In order to obtain the required micrometric surface cleanliness and measurement accuracy, correlation relationships were established between the main parameters of the process, equations of the equilibrium system of shear forces were compiled and analytical expressions were obtained based on the analysis of kinematic and dynamic properties of the system.

Download Full-text

Effect of Therapy Using Aquatic Treadmill on the Functional Status of Patients with Knee Arthrosis

Acta Balneologica ◽

10.36740/abal202001105 ◽

2020 ◽

Vol 62 (1) ◽

pp. 27-32 ◽

Cited By ~ 1

Author(s):

Agnieszka Maruszewska ◽

Lech Panasiuk ◽

Agnieszka Buczaj ◽

Anna Pecyna

Keyword(s):

Range Of Motion ◽

Perceived Exertion ◽

Treadmill Exercise ◽

Exercise Programme ◽

Locomotor System ◽

Lequesne Index ◽

Knee Arthrosis ◽

Index Of Severity ◽

And Function ◽

Aquatic Treadmill

Introduction: Arthrosis is considered as a disease of the whole locomotor system, which may be prevented and treated at early stages. Gonarthrosis develops gradually within 10-15 years, interfering with daily activities and capability for work. Aquatic exercises are considered as a potentially effective therapeutic intervention in persons with knee arthrosis. Aim: Assessment of the effectiveness of a 4-week aquatic treadmill exercise programme, with respect to the measurement of pain, balance, function, and mobility. Materials and Methods: The study covered 15 patients with gonarthrosis, using a 4-week cycle of exercises. The results of measurements included a visual-analogue scale for assessing pain, Time Up and Go (TUG) for balance, 6-meter walk test for mobility and Lequesne index for function. The exercise protocol covered an aquatic treadmill using water jets to destabilize while standing, and achieve high ratings of perceived exertion during walking. Results: The comparison of results obtained by the patients after 20 interventions, with those obtained before therapy allowing the presumption that on the level of significance α= 0.05 there occurred statistically significant differences in the results of the tests performed (p<0.05). This concerned both pain complaints (VAS scale, Lequesne index of severity for arthrosis of the knee), as well as functional tests TUG, and measurement of the range of motion (p = 0.041-0.001). Conclusions: Based on the results of the study a decrease was observed in pain complaints, improvement of the range of motion in the joints, balance and function, after participation in a 4-week aquatic treadmill exercise programme, which contained the components of balance and endurance training.

Download Full-text

Responses to gait retraining using pressure-based auditory feedback for medial knee osteoarthritis

Osteoarthritis and Cartilage ◽

10.1016/j.joca.2021.02.111 ◽

2021 ◽

Vol 29 ◽

pp. S81-S82

Author(s):

J. He ◽

C. Ferrigno ◽

N. Shakoor ◽

M.A. Wimmer

Keyword(s):

Knee Osteoarthritis ◽

Auditory Feedback ◽

Gait Retraining ◽

Medial Knee ◽

Medial Knee Osteoarthritis

Download Full-text

A comparison between laterally wedged insoles and ankle-foot orthoses for the treatment of medial osteoarthritis of the knee: A randomized cross-over trial

Clinical Rehabilitation ◽

10.1177/0269215521993636 ◽

2021 ◽

pp. 026921552199363

Author(s):

Martin Schwarze ◽

Leonie P Bartsch ◽

Julia Block ◽

Merkur Alimusaj ◽

Ayham Jaber ◽

...

Keyword(s):

Knee Osteoarthritis ◽

Controlled Trial ◽

Oxford Knee Score ◽

Knee Adduction Moment ◽

Osteoarthritis Of The Knee ◽

Knee Score ◽

Medial Knee ◽

Medial Knee Osteoarthritis ◽

Patient Reported ◽

Angular Impulse

Objective: To compare biomechanical and clinical outcome of laterally wedged insoles (LWI) and an ankle-foot orthosis (AFO) in patients with medial knee osteoarthritis. Design: Single-centre, block-randomized, cross-over controlled trial. Setting: Outpatient clinic. Subjects: About 39 patients with symptomatic medial knee osteoarthritis. Interventions: Patients started with either LWI or AFO, determined randomly, and six weeks later changed to the alternative. Main measures: Change in the 1st maximum of external knee adduction moment (eKAM) was assessed with gait analysis. Additional outcomes were other kinetic and kinematic changes and the patient-reported outcomes EQ-5D-5L, Oxford Knee Score (OKS), American Knee Society Clinical Rating System (AKSS), Hannover Functional Ability Questionnaire – Osteoarthritis and knee pain. Results: Mean age (SD) of the study population was 58 (8) years, mean BMI 30 (5). Both aids significantly improved OKS (LWI P = 0.003, AFO P = 0.001), AKSS Knee Score (LWI P = 0.01, AFO P = 0.004) and EQ-5D-5L Index (LWI P = 0.001, AFO P = 0.002). AFO reduced the 1st maximum of eKAM by 18% ( P < 0.001). The LWI reduced both maxima by 6% ( P = 0.02, P = 0.03). Both AFO and LWI reduced the knee adduction angular impulse (KAAI) by 11% ( P < 0.001) and 5% ( P = 0.05) respectively. The eKAM (1st maximum) and KAAI reduction was significantly larger with AFO than with LWI ( P = 0.001, P = 0.004). Conclusions: AFO reduces medial knee load more than LWI. Nevertheless, no clinical superiority of either of the two aids could be shown.

Download Full-text