Patellar Tendinopathy Alters the Distribution of Lower Extremity Net Joint Moments during Hopping

2010 ◽  
Vol 26 (3) ◽  
pp. 249-255 ◽  
Author(s):  
Richard B. Souza ◽  
Shruti Arya ◽  
Christine D. Pollard ◽  
George Salem ◽  
Kornelia Kulig
Keyword(s):  
Articular Cartilage ◽  
Lower Extremity ◽  
Sagittal Plane ◽  
Patellar Tendinopathy ◽  
Current Investigation ◽  
Long Term Effects ◽  
Joint Moments ◽  
Control Subjects ◽  
Plane Joint

The purpose of the current investigation was to test the hypothesis that subjects with patellar tendinopathy would demonstrate altered sagittal plane joint moment contributions during hopping tasks. Fourteen subjects (7 patellar tendinopathy, 7 controls) participated. Sagittal net joint moments of the lower extremity, total support moment, and joint contributions to the total support moment were calculated while subjects hopped continuously at a self-selected frequency and at 1.67 Hz. Significant differences were observed for contributions to the total support moment (p= .022). When averaged across hopping frequencies, subjects with patellar tendinopathy demonstrated greater hip contribution (p= .030) and lesser knee contribution (p= .006) compared with the control subjects. Shifting the workload away from the knee and toward the hip may result in a detrimental increase in hip demand and potentially harmful long-term effects on the articular cartilage of the hip.

scholarly journals The effect of stride length on lower extremity joint kinetics at various gait speeds

2018 ◽  
Author(s):  
Robert L. McGrath ◽  
Melissa L. Ziegler ◽  
Margaret Pires-Fernandes ◽  
Brian A. Knarr ◽  
Jill S. Higginson ◽  
...  
Keyword(s):  
Lower Extremity ◽  
Gait Speed ◽  
Stride Length ◽  
Inverse Dynamics ◽  
Sagittal Plane ◽  
Gait Training ◽  
Joint Moment ◽  
Joint Moments ◽  
Joint Kinetics ◽  
Trailing Limb Angle

AbstractRobot-assisted training is a promising tool under development for improving walking function based on repetitive goal-oriented task practice. The challenges in developing the controllers for gait training devices that promote desired changes in gait is complicated by the limited understanding of the human response to robotic input. A possible method of controller formulation can be based on the principle of bio-inspiration, where a robot is controlled to apply the change in joint moment applied by human subjects when they achieve a gait feature of interest. However, it is currently unclear how lower extremity joint moments are modulated by even basic gaitspatio-temporal parameters.In this study, we investigated how sagittal plane joint moments are affected by a factorial modulation of two important gait parameters: gait speed and stride length. We present the findings obtained from 20 healthy control subjects walking at various treadmill-imposed speeds and instructed to modulate stride length utilizing real-time visual feedback. Implementing a continuum analysis of inverse-dynamics derived joint moment profiles, we extracted the effects of gait speed and stride length on joint moment throughout the gait cycle. Moreover, we utilized a torque pulse approximation analysis to determine the timing and amplitude of torque pulses that approximate the difference in joint moment profiles between stride length conditions, at all gait speed conditions.Our results show that gait speed has a significant effect on the moment profiles in all joints considered, while stride length has more localized effects, with the main effect observed on the knee moment during stance, and smaller effects observed for the hip joint moment during swing and ankle moment during the loading response. Moreover, our study demonstrated that trailing limb angle, a parameter of interest in programs targeting propulsion at push-off, was significantly correlated with stride length. As such, our study has generated assistance strategies based on pulses of torque suitable for implementation via a wearable exoskeleton with the objective of modulating stride length, and other correlated variables such as trailing limb angle.

Intralimb Joint Coordination Patterns of the Lower Extremity in Maximal Velocity Phase Sprint Running

2010 ◽  
Vol 26 (2) ◽  
pp. 188-195 ◽  
Author(s):  
Marianne J.R. Gittoes ◽  
Cassie Wilson
Keyword(s):  
Lower Extremity ◽  
Sagittal Plane ◽  
Coordination Pattern ◽  
Maximal Velocity ◽  
Joint Coordination ◽  
Sprint Running ◽  
Joint Coupling ◽  
Plane Joint ◽  
Coordination Patterns ◽  
Coordinate Data

This study aimed to develop insight into the lower extremity joint coupling motions used in the maximal velocity phase of sprint running. Two-dimensional coordinate data were used to derive sagittal plane joint angle profiles of sprint running trials. Intralimb joint coupling motions were examined using a continuous relative phase (CRP) analysis. The knee-ankle (KA) coupling was more out of phase compared with the hip-knee (HK) coupling across the step phase (mean CRP: KA 89.9° HK 34.2°) and produced a lower within-athlete CRP variability (VCRP) in stance. Touchdown (TD) produced more out-of-phase motions and a larger VCRP than toe-off. A destabilization of the lower extremity coordination pattern was considered necessary at TD to allow for the swing-to-stance transition. The key role that the KA joint motion has in the movement patterns used by healthy athletes in the maximal velocity phase of sprint running was highlighted.

scholarly journals Lower Extremity Kinematics and Ground Reaction Forces After Prophylactic Lace-Up Ankle Bracing

2008 ◽  
Vol 43 (3) ◽  
pp. 234-241 ◽  
Author(s):  
Lindsay J. DiStefano ◽  
Darin A. Padua ◽  
Cathleen N. Brown ◽  
Kevin M. Guskiewicz
Keyword(s):  
Lower Extremity ◽  
Range Of Motion ◽  
Knee Flexion ◽  
Sagittal Plane ◽  
Control Group ◽  
Ground Contact ◽  
Long Term Effects ◽  
Ankle Motion ◽  
Reaction Forces ◽  
Ankle Bracing

Abstract Context: Long-term effects of ankle bracing on lower extremity kinematics and kinetics are unknown. Ankle motion restriction may negatively affect the body's ability to attenuate ground reaction forces (GRFs). Objective: To evaluate the immediate and long-term effects of ankle bracing on lower extremity kinematics and GRFs during a jump landing. Design: Experimental mixed model (2 [group] × 2 [brace] × 2 [time]) with repeated measures. Setting: Sports medicine research laboratory. Patients or Other Participants: A total of 37 healthy subjects were assigned randomly to either the intervention (n  =  11 men, 8 women; age  =  19.63 ± 0.72 years, height  =  176.05 ± 10.58 cm, mass  =  71.50 ± 13.15 kg) or control group (n  =  11 men, 7 women; age  =  19.94 ± 1.44 years, height  =  179.15 ± 8.81 cm, mass  =  74.10 ± 10.33 kg). Intervention(s): The intervention group wore braces on both ankles and the control group did not wear braces during all recreational activities for an 8-week period. Main Outcome Measure(s): Initial ground contact angles, maximum joint angles, time to reach maximum joint angles, and joint range of motion for sagittal-plane knee and ankle motion were measured during a jump-landing task. Peak vertical GRF and the time to reach peak vertical GRF were assessed also. Results: While participants were wearing the brace, ankle plantar flexion at initial ground contact (brace  =  35° ± 13°, no brace  =  38° ± 15°, P  =  .024), maximum dorsiflexion (brace  =  21° ± 7°, no brace  =  22° ± 6°, P  =  .04), dorsiflexion range of motion (brace  =  56° ± 14°, no brace  =  59° ± 16°, P  =  .001), and knee flexion range of motion (brace  =  79° ± 16°, no brace  =  82° ± 16°, P  =  .036) decreased, whereas knee flexion at initial ground contact increased (brace  =  12° ± 9°, no brace  =  9° ± 9°, P  =  .0001). Wearing the brace for 8 weeks did not affect any of the outcome measures, and the brace caused no changes in vertical GRFs (P > .05). Conclusions: Although ankle sagittal-plane motion was restricted with the brace, knee flexion upon landing increased and peak vertical GRF did not change. The type of lace-up brace used in this study appeared to restrict ankle motion without increasing knee extension or vertical GRFs and without changing kinematics or kinetics over time.

scholarly journals Effect of Previous Groin Pain on Sagittal Plane Joint Moments During Soccer Instep Kicks

2019 ◽  
Vol 51 (Supplement) ◽  
pp. 64-65
Author(s):  
Anna C. Severin ◽  
Daniel B. Mellifont ◽  
Mark GL Sayers
Keyword(s):  
Groin Pain ◽  
Sagittal Plane ◽  
Joint Moments ◽  
Plane Joint

The long-term effects of combined radiation therapy and chemotherapy on articular cartilage: animal study

1999 ◽  
Vol 35 ◽  
pp. S188
Author(s):  
H.H.W. Chen ◽  
F.F. Chen ◽  
I.M. Jou ◽  
A.W.R. Su ◽  
N.T. Chiu ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
Articular Cartilage ◽  
Animal Study ◽  
Long Term Effects
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