ankle joint

..The kinematics from these populations are being compared to our normative database. In Vivo Ankle Joint Function Currently we are developing the first normative database (n=32) for in vivo ankle joint kinematics, ..

..and up slopes, running, and jumping, all of which require significant net positive power at the knee joint, ankle joint, or both...

..and up slopes, running, and jumping, all of which require significant net positive power at the knee joint, ankle joint, or both...

..Our past research revealed that the generation of forward velocity during normal gait arises primarily from ankle joint plantar flexor push-off, rather than through a controlled fall...

..measure the change in in vivo joint kinematics after lateral ankle ligament injuries, using the contralateral ankle joint as a control...

..The focus of this proposal is on the ankle joint and its ligament injuries...

..and pathologically progressive (degenerative) aging by documenting changes in a joint that rarely develops OA (ankle joint) compared to changes in a joint with the higher prevalence of OA (knee joint)...

..We hypothesize that feedback loop delay in ankle joint force output in response to a perturbation, related primarily to a DPN-associated impairment in rate of ..

..The powered orthoses will exert a torque about the ankle joint, altering normal lower limb kinematics if muscle activity patterns are not modified...

..This project will relate the properties of muscles controlling the ankle joint to balance performance in healthy young (21-35 yrs) and older (65-80 yrs) humans...

..objective of the proposed research is to quantify the neuromechanical influence of sensory feedback from the ankle joint over a range of speeds and gaits during cat locomotion...

..This application focuses specifically on the KC-mediated recruitment and activation of neutrophils in the ankle joint during Bb infection...

..of restitution of motor and sensory reinnervation of muscles and the recovery of normal muscle activity and ankle joint movements will be studied in rats after transection and surgical repair of the sciatic nerve...

..of this study are to develop a new portable rehabilitation device with intelligent control to stretch an ankle joint with spasticity and/or contracture repeatedly to reduce spasticity/contracture in neurologically impaired ..

..In 3Dal space, these variables will be quantified at systematically varying ankle joint positions and muscle activation levels...

..In 3Dal space, these variables will be quantified at systematically varying ankle joint positions and muscle activation levels...

..This model gives a repeatable and quantifiable index of persistent pain in the ankle joint and the preliminary data show that acupuncture at a remote site produces long-lasting analgesia in this model...

..on potential risk factors suggested by preliminary and other studies, demographic information, morphometry, ankle joint laxity, anatomic alignment of the foot and ankle, isokinetic ankle strength, postural stability, and muscle ..

..The human ankle joint provides a unique opportunity for the study of post-traumatic OA because of the low risk of primary OA and the ..

..mechanisms could be developed to provide a more stable base to users during standing activities (locked ankle joint) and allowing the ankle-foot system to conform to an appropriate roll-over shape during walking (unlocked ankle ..

..mechanisms could be developed to provide a more stable base to users during standing activities (locked ankle joint) and allowing the ankle-foot system to conform to an appropriate roll-over shape during walking (unlocked ankle ..

..status of the neural mechanisms of articular pain has relied mainly on experimental models of the knee or ankle joint. However, organizational differences between trigeminal and spinal systems suggest the mechanisms that mediate ..

..Overground versus treadmill gait patterns revealed minimal differences. Consideration of the effects of slower walking speed may help clinicians create interventions to target primary gait deficits on overground or treadmill walking...

..Of the moment parameters, four had a linear relationship with gait speed, while four had a quadratic one. These relationships shown in the tables and graphs here can be used as a reference for 'normal' gait parameter values...

..abductors had more knee extensor loading due to plantarflexor weakness and dorsiflexion angle of the orthotic ankle joint. The subjects with orthoses also generated more power at the hip to supplement the power generation lost to ..

..stiffness (change in joint moment divided by change in joint angle) was constant (7 N x m x deg(-1)) in the ankle joint and increased from 17 to 24 N x m x deg(-1) (P < 0.01) in the knee joint...

..Altered joint kinematics due to the absence of individual muscle action is discussed in the light of pathological gait kinematics and clinical decision-making...

..Power generation at the hip in stance is pointed out to be an important mechanism for propulsion during walking...

..Three-dimensional gait analysis may assist future investigations of the effects of orthopaedic surgery on functional mobility in RA to prevent irreversible disablement...

..These kinematic and kinetic changes, along with previously studied effects of pressure relief at the metatarsal heads, should aid medical professionals in prescribing prophylactic footwear...

..Hip joint power was decreased by 37% while knee joint power was increased by 13%. Ankle joint power did not change...

..These intra- and interlimb motor-programming alterations (ie, substitution strategies) could potentially slow or limit rehabilitation, and induce strength and performance deficits...

..4. The results indicate that time-distance parameters and sagittal plane gait kinematics of the paretic lower limb, measured by the Vicon 370 gait analysis system, are repeatable and can be used to assess treatment effects after stroke...

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..Overall, the new stance-control knee-ankle-foot orthosis provided more natural gait kinematics for orthosis users compared to conventional knee-ankle-foot-orthoses...

..It is the intention that the results of this study may be used as a basis for comparison with patient data...

..The results of this study demonstrated improved function during walking as assessed using gait analysis techniques...

..It was concluded that the modified new heel cushion of the shoe provided freedom to the lower legs and thereby increased walking efficiency...

..We assume that the difference is due to gender features of the gait-related anatomy and habits. Comparison with other research shows some evidence for racial differences...

..This new methodology will be useful in clinical settings to identify, characterize, and monitor recovery from asymmetric behaviors associated with injuries or pathologies...

..This study shows that MADYMO can be successfully applied to accomplish forward dynamic simulations, given kinetic inputs. Future applications include predicting muscle forces and decomposing external kinetics...

..The reduced MF seen when wearing AFOs suggested an improvement of walking endurance. The DAFO had the advantage of less restriction on ankle movement, which avoids muscular atrophy and improves orthotic compliance...

..1m height and thickness and 1m width. Outcome measures were gait velocity, hip, knee and ankle joint angles and leading limb preference...

..From a therapeutic perspective, this suggests that training individuals with neurological injuries on a treadmill appears to be justified...

..The authors conclude that well-selected surgery improves function of the spastic muscle. The importance of assessing clinical, kinematic, and kinetic data together for proper evaluation of gait is stressed...

..Future studies are needed to delineate the differential contributions of each potential factor to gait abnormalities. Understanding the underlying neuromechanical changes after stroke may aid the development of rehabilitation strategies...

..The maximum hip extension was not significant in all three groups. Conclusion: when indicated to improve the extension of the knees and ankle in the stance of the CP patients floor reaction ankle-foot orthosis was effective...

..Research aimed at determining how to best maximize surgical knee function must continue if these potential negative sequela are to be minimized...

..05). Together, these results suggest that passive-elastic mechanisms can contribute substantially to normal human walking and that biarticular muscles play a role in passively transferring energy between joints...

..Thus, rollator walking did not result in an overall unloading of the muscles and joints of the lower extremities. However, the long-term effect of rollator walking is unknown and further investigation in this field is needed...

..This point should be confirmed with other subjects, possibly pathologic, and other movements...

..That is, elderly individuals' adaptations to walking in water differ from those in the younger age group. This fact should be considered when prescribing rehabilitation or fitness programs for these populations...

..The IAA model provides a tool for examining various aspects of abnormal gait independently and quantitatively...

..Based on our model, we suggested that the altered steady state gait patterns observed in the elderly may be due to an altered neuromuscular memory of prior joint behaviors...

..The dichotomy between internal moments and muscle effort (ie, electromyographic activity) was consistent with the reduction in force-generation capacity of the calf muscles when the ankle was in a plantarflexed position...

..In addition, the technique and muscle activation are similar between the two types of squats. This observation supports the view that HG resistance training may represent an important countermeasure to microgravity...

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..These findings suggest that in the case of transferring the body-mass to another supporting base the central nervous system immediately adjusts the size of the initial impetus to optimize the performance...

..In contrast, performing a forward lunge with the trunk extended did not alter joint impulse or activation of the lower extremity musculature. LEVEL OF EVIDENCE: Therapy, level 5...

..This suggests that the use of a weight belt may improve a lifter's explosive power by increasing the speed of the movement without compromising the joint range of motion or overall lifting technique...

The aim of this study was to investigate motor control in subjects with functional instability of the ankle joint. This was achieved by analysing patterns of lower extremity motion prior to and immediately following landing during single ..

..These results indicate that biomechanical indications and limitations of lateral wedges in unstable lateral ankles should be analyzed in more detail, possibly leading to new guidelines for the use of such foot orthoses...

..data it was assumed that passive ankle torque was the sum of torque due to structures which crossed only the ankle joint (this torque was a 6-parameter function of ankle joint angle) and a torque due to the gastrocnemius muscle (a 3-..

..Spasticity in only the ankle joint muscles influenced the subject's gait and standing position compared to the subgroups with a flaccid paresis...

..The elimination of knee flexor activity of semitendinosus and gastrocnemius combined with transfer of distal rectus femoris led to an improvement in gait as confirmed by gait analysis...

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..Although our findings offer some insight into the relationship between foot characteristics and lateral ankle injuries, future research is needed to confirm the results of this review and expand this area of investigation...

..The results show that, although general locomotor strategies are the same for active and inactive young adults, locomotor behavior is not homogeneous...

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..RELEVANCE: This study highlights the challenges of stair climbing compared to level walking in a within subject design. Key features of stair climbing that are important for the rehabilitation of step management are also reported...

..This and further findings suggest that there is a certain inclination angle or angular range where subjects do switch between a level walking and a stair walking gait pattern...

..The low mechanical advantage in running humans may also explain previous observations of a greater metabolic cost of transport for running humans compared with trotting and galloping quadrupeds of similar size...

..After training, subjects were able to generate higher levels of powers and demonstrated increases in positive work performed by the ankle plantar flexor and hip flexor/extensor muscles...

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..The Broström operation improved stability without excessively restricting subtalar movement, but was not effective in addressing the internal rotation laxity...

..007), and increased hip external rotation ROM (P=.008). CONCLUSIONS: The MKD group exhibited tight and weak ankle musculature. Interventions focusing on improving strength and ROM of the ankle may improve kinematics during a squat...

..We believe this is due to either an ankle-stiffening strategy during heel strike or from the inversion of the foot causing external rotation of the tibia as a stabilizing technique for the knee...

..The foot calibration rig employed in both the AL and FUN model provided an easy alternative to define the foot segment and obtain repeatable data, without accurately locating ALs on the foot...

..This difference between the response to hip flexion and the response to extension indicates a specificity of the reflex, suggesting that organized pathways for coordinating leg movements are involved...

..Use of this synthetic homogeneous method developed for both kinematics and dynamics of rigid bodies demonstrates good promise for applications in biomechanics...

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..Changes in single-leg hop landing performance could be used to demonstrate functional improvement in patients due to training or physical therapy...

..24 to 1.92 N.m/kg. The peak knee joint moment ranged from 0.51 to 1.97 N.m/kg, and the peak ankle joint moment ranged from -0.11 to 1.32 N.m/kg...