The effect of prosthetic alignment on hip and knee joint kinetics in individuals with transfemoral amputation

2020 ◽  
Vol 76 ◽  
pp. 85-91 ◽  
Author(s):  
Tengyu Zhang ◽  
Xuefei Bai ◽  
Fei Liu ◽  
Run Ji ◽  
Yubo Fan
Keyword(s):  
Knee Joint ◽  
Transfemoral Amputation ◽  
Joint Kinetics ◽  
Prosthetic Alignment

scholarly journals Effects of prophylactic knee bracing on knee joint kinetics and kinematics during netball specific movements

2017 ◽  
Vol 23 ◽  
pp. 93-98 ◽  
Author(s):  
Jonathan K. Sinclair ◽  
Hayley Vincent ◽  
Jim D. Richards
Keyword(s):  
Knee Joint ◽  
Joint Kinetics

scholarly journals Machine Learning-Based Estimation of Ground Reaction Forces and Knee Joint Kinetics from Inertial Sensors While Performing a Vertical Drop Jump

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7709
Author(s):  
Serena Cerfoglio ◽  
Manuela Galli ◽  
Marco Tarabini ◽  
Filippo Bertozzi ◽  
Chiarella Sforza ◽  
...  
Keyword(s):  
Neural Network ◽  
Machine Learning ◽  
Knee Joint ◽  
Field Analysis ◽  
Ground Reaction Forces ◽  
Drop Jump ◽  
Joint Moments ◽  
Data Set ◽  
Joint Kinetics ◽  
Reaction Forces

Nowadays, the use of wearable inertial-based systems together with machine learning methods opens new pathways to assess athletes’ performance. In this paper, we developed a neural network-based approach for the estimation of the Ground Reaction Forces (GRFs) and the three-dimensional knee joint moments during the first landing phase of the Vertical Drop Jump. Data were simultaneously recorded from three commercial inertial units and an optoelectronic system during the execution of 112 jumps performed by 11 healthy participants. Data were processed and sorted to obtain a time-matched dataset, and a non-linear autoregressive with external input neural network was implemented in Matlab. The network was trained through a train-test split technique, and performance was evaluated in terms of Root Mean Square Error (RMSE). The network was able to estimate the time course of GRFs and joint moments with a mean RMSE of 0.02 N/kg and 0.04 N·m/kg, respectively. Despite the comparatively restricted data set and slight boundary errors, the results supported the use of the developed method to estimate joint kinetics, opening a new perspective for the development of an in-field analysis method.

Elevated Knee Joint Kinetics and Reduced Ankle Kinetics Are Present During Jogging and Hopping After Achilles Tendon Ruptures

2017 ◽  
Vol 45 (5) ◽  
pp. 1124-1133 ◽  
Author(s):  
Richard W. Willy ◽  
Annelie Brorsson ◽  
Hayley C. Powell ◽  
John D. Willson ◽  
Roy Tranberg ◽  
...  
Keyword(s):  
Knee Joint ◽  
Lower Extremity ◽  
Achilles Tendon ◽  
Patellofemoral Joint ◽  
Tendon Rupture ◽  
Achilles Tendon Rupture ◽  
Joint Power ◽  
Joint Stress ◽  
Joint Kinetics ◽  
Joint Loads

Background: Deficits in plantarflexor function are common after an Achilles tendon rupture. These deficits may result in an altered distribution of joint loads during lower extremity tasks. Hypothesis: We hypothesized that, regardless of treatment, the Achilles tendon–ruptured limb would exhibit deficits in ankle kinematics and joint power while exhibiting elevated knee joint power and patellofemoral joint loads during walking, jogging, and hopping. We further hypothesized that this loading pattern would be most evident during jogging and hopping. Study Design: Controlled laboratory study. Methods: Thirty-four participants (17 participants treated surgically, 17 treated nonsurgically) were tested at a mean 6.1 ± 2.0 years after an Achilles tendon rupture. Lower extremity kinematics and kinetics were assessed while participants completed walking, jogging, and single-legged hopping trials. Patellofemoral joint stress was calculated via a musculoskeletal model. Data were analyzed via mixed-model repeated analyses of variance (α = .05) and the limb symmetry index (LSI). Results: No differences ( P ≥ .05) were found between the surgical and nonsurgical groups. In both groups, large side-to-side deficits in the plantarflexion angle at toeoff (LSI: 53.5%-73.9%) were noted during walking, jogging, and hopping in the involved limb. Side-to-side deficits in the angular velocity were only present during jogging (LSI: 93.5%) and hopping (LSI: 92.5%). This pattern was accompanied by large deficits in eccentric (LSI: 80.8%-94.7%) and concentric (LSI: 82.2%-84.7%) ankle joint powers in the involved limb during all tasks. Interestingly, only jogging and hopping demonstrated greater knee joint loads when compared with the uninvolved limb. Concentric knee power was greater during jogging (LSI: 117.2%) and hopping (LSI: 115.9%) compared with the uninvolved limb. Similarly, peak patellofemoral joint stress was greater in the involved limb during jogging (LSI: 107.5%) and hopping (LSI: 107.1%), while only hopping had a greater loading rate of patellofemoral joint stress (LSI: 110.9%). Conclusion: Considerable side-to-side deficits in plantarflexor function were observed during walking, jogging, and hopping in patients after an Achilles tendon rupture. As a possible compensation, increased knee joint loads were present but only during jogging and hopping. Clinical Relevance: These data suggest that after an Achilles tendon rupture, patients may be susceptible to greater mechanical loading of the knee during sporting tasks, regardless of surgical or nonsurgical treatment.

scholarly journals EFFECTS OF QUADRICEPS FATIGUE ON KNEE JOINT KINETICS DURING SLIP INDUCED FALLS

2007 ◽  
Vol 40 ◽  
pp. S112
Author(s):  
Prakriti Parijat ◽  
Thurmon Lockhart
Keyword(s):  
Knee Joint ◽  
Joint Kinetics

Biomechanical responses of young adults with unilateral transfemoral amputation using two types of mechanical stance control prosthetic knee joints

2020 ◽  
Vol 44 (5) ◽  
pp. 314-322
Author(s):  
Jan Andrysek ◽  
Daniela García ◽  
Claudio Rozbaczylo ◽  
Carlos Alvarez-Mitchell ◽  
Rebeca Valdebenito ◽  
...  
Keyword(s):  
Young Adults ◽  
Knee Joint ◽  
Stance Phase ◽  
Pelvic Tilt ◽  
Swing Phase ◽  
Knee Joints ◽  
Transfemoral Amputation ◽  
Phase Duration ◽  
Prosthetic Knee ◽  
Stance Control

Background: Prosthetic knee joint function is important in the rehabilitation of individuals with transfemoral amputation. Objectives: The objective of this study was to assess the gait patterns associated with two types of mechanical stance control prosthetic knee joints—weight-activated braking knee and automatic stance-phase lock knee. It was hypothesized that biomechanical differences exist between the two knee types, including a prolonged swing-phase duration and exaggerated pelvic movements for the weight-activated braking knee during gait. Study design: Prospective crossover study. Methods: Spatiotemporal, kinematic, and kinetic parameters were obtained via instrumented gait analysis for 10 young adults with a unilateral transfemoral amputation. Discrete gait parameters were extracted based on their magnitudes and timing. Results: A 1.01% ± 1.14% longer swing-phase was found for the weight-activated braking knee (p < 0.05). The prosthetic ankle push-off also occurred earlier in the gait cycle for the weight-activated braking knee. Anterior pelvic tilt was 3.3 ± 3.0 degrees greater for the weight-activated braking knee. This range of motion was also higher (p < 0.05) and associated with greater hip flexion angles. Conclusions: Stance control affects biomechanics primarily in the early and late stance associated with prosthetic limb loading and unloading. The prolonged swing-phase time for the weight-activated braking knee may be associated with the need for knee unloading to initiate knee flexion during gait. The differences in pelvic tilt may be related to knee stability and possibly the different knee joint stance control mechanisms. Clinical relevance Understanding the influence of knee function on gait biomechanics is important in selecting and improving treatments and outcomes for individuals with lower-limb amputations. Weight-activated knee joints may result in undesired gait deviations associated with stability in early stance-phase, and swing-phase initiation in the late stance-phase of gait.

Experimentally Induced Anterior Knee Pain Results In Altered Knee Joint Kinetics

2005 ◽  
Vol 37 (Supplement) ◽  
pp. S144
Author(s):  
Anthony G. Schache ◽  
Kay M. Crossley ◽  
Tim V. Wrigley
Keyword(s):  
Knee Joint ◽  
Knee Pain ◽  
Anterior Knee Pain ◽  
Joint Kinetics ◽  
Anterior Knee ◽  
Experimentally Induced

Effect of BMI on Knee Joint Torques in Ergometer Rowing

2013 ◽  
Vol 29 (6) ◽  
pp. 763-768 ◽  
Author(s):  
Karen Roemer ◽  
Tibor Hortobagyi ◽  
Chris Richter ◽  
Yolanda Munoz-Maldonado ◽  
Stephanie Hamilton
Keyword(s):  
Knee Joint ◽  
Weight Bearing ◽  
Normal Weight ◽  
Obese Adults ◽  
Joint Kinetics ◽  
Joint Torques ◽  
Ergometer Rowing ◽  
Lower Extremity Biomechanics ◽  
High Bmi

Although an authoritative panel recommended the use of ergometer rowing as a non-weight-bearing form of exercise for obese adults, the biomechanical characterization of ergometer rowing is strikingly absent. We examined the interaction between body mass index (BMI) relative to the lower extremity biomechanics during rowing in 10 normal weight (BMI 18–25), 10 overweight (BMI 25–30 kg·m−2), and 10 obese (BMI > 30 kg·m−2) participants. The results showed that BMI affects joint kinematics and primarily knee joint kinetics. The data revealed that high BMI leads to unfavorable knee joint torques, implying increased loads of the medial compartment in the knee joint that could be avoided by allowing more variable foot positioning on future designs of rowing ergometers.

Three-Dimensional Knee Joint Kinetics During a Golf Swing

1998 ◽  
Vol 26 (2) ◽  
pp. 285-294 ◽  
Author(s):  
Charles J. Gatt ◽  
Michael J. Pavol ◽  
Richard D. Parker ◽  
Mark D. Grabiner
Keyword(s):  
Knee Joint ◽  
Three Dimensional ◽  
Skill Level ◽  
Golf Swing ◽  
Joint Kinetics ◽  
Peak Loads ◽  
Knee Rehabilitation ◽  
Peak Knee ◽  
Knee Loading ◽  
Joint Loads

This study characterized knee joint kinetics during a golf swing and determined the influence of shoe type and golfer skill on the peak knee joint loads. Thirteen golfers each hit a golf ball using a five iron under two footware conditions: spiked and spikeless golf shoes. Data from a video-based motion capture system and force plates were used to compute the knee joint kinetics. Mean peak forces and moments differed significantly between the lead and trail knees, but these peak loads were not significantly affected by shoe type. Only the lead knee flexion and internal rotation moments were significantly correlated to skill level. The magnitude of some of the peak loads at the knee during the golf swing approached those reached during activities prohibited until late-stage knee rehabilitation. We concluded the following: The type of shoe worn and the skill level of the golfer need not be considered in deciding time to return to golfing; however, the leg that is recovering from surgery or injury should be considered. The most stressful phase of the golf swing, relative to the knee, is the downswing. There is probably no “normal” swing; each golfer seems to possess consistent, characteristic, patterns of knee loading.

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