Minimal Detectable Change in Quadriceps Strength and Voluntary Muscle Activation in Patients With Knee Osteoarthritis

Kean, Crystal O.; Birmingham, Trevor B.; Garland, S. Jayne; Bryant, Dianne; Giffin, J. Robert

doi:10.1016/j.apmr.2010.06.002

Cited by 89 publications

(81 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Therefore, calculation of VA 60-100% may be less accurate for submaximal muscle stimulation. However, in common practice, when VA is usually determined by the superimposed responses upon the highest of a few maximal voluntary contractions, 9,[22][23][24] there are indications that VA may be overestimated with maximal nerve stimulation. Several subjects were able to elicit voluntary torques above MTC 100% , and consequently VA 100% was calculated to be above 100%.…”

Section: Discussion Superimposed Torquementioning

confidence: 99%

“…Therefore, in most studies VA has been calculated with the superimposed responses upon the highest of a few maximal voluntary contractions. 9,[22][23][24] However, if the relationship indeed is curvilinear, VA is overestimated for lower contraction intensities, 2,3,7,25 such as those observed in patients. 2,9,10,12 For maximal contractions VA may also be overestimated, but without a gold standard for the maximal torque capacity (MTC), the extent of overestimation cannot be assessed.…”

Section: Muscle Nerve 45: 841-848 2012mentioning

confidence: 99%

See 1 more Smart Citation

Effect of stimulation intensity on assessment of voluntary activation

2012

View full text Add to dashboard Cite

Introduction: The interpolated twitch technique is often used to assess voluntary activation (VA) of skeletal muscles. We investigated VA and the voluntary torque-superimposed torque relationship using either supramaximal nerve stimulation or better tolerated submaximal muscle stimulation, which is often used with patients. Methods: Thirteen healthy subjects performed maximal and submaximal isometric knee extensions with superimposed maximal or submaximal doublets (100 Hz). Results: Superimposed torque relative to potentiated resting doublets was smaller with maximal nerve than with submaximal muscle stimulation. Maximal VA was 87 6 7% and 93 6 5% for submaximal muscle and maximal nerve stimulation, respectively. The individual voluntary torque-superimposed torque relationships were more linear for submaximal muscle stimulation, possibly leading to less overestimation of VA. Conclusions: Submaximal muscle stimulation can be used to estimate VA in the knee extensors. It is less painful, and overestimation of VA may be less compared with maximal nerve stimulation.

show abstract

Section: Discussion Superimposed Torquementioning

confidence: 99%

Section: Muscle Nerve 45: 841-848 2012mentioning

confidence: 99%

Effect of stimulation intensity on assessment of voluntary activation

2012

View full text Add to dashboard Cite

show abstract

“…This normalized measure (in Nm/kg) was used for the analyses. Excellent intrarater reliability (intraclass correlation coefficient [ICC] 0.93) has been reported for this measure in knee OA patients (28).…”

Section: Biomechanical Factorsmentioning

confidence: 93%

Association of lower muscle strength with self‐reported knee instability in osteoarthritis of the knee: Results from the Amsterdam Osteoarthritis Cohort

Knoop¹,

Leeden²,

Esch³

et al. 2011

Arthritis Care & Research

106

View full text Add to dashboard Cite

Objective. To determine whether muscle strength, proprioceptive accuracy, and laxity are associated with self-reported knee instability in a large cohort of knee osteoarthritis (OA) patients, and to investigate whether muscle strength may compensate for impairment in proprioceptive accuracy or laxity, in order to maintain knee stability. Methods. Data from 283 knee OA patients from the Amsterdam Osteoarthritis cohort were used. Univariable and multivariable logistic regression analyses were performed to assess the association between muscle strength, proprioceptive accuracy (motion sense), frontal plane varus-valgus laxity, and self-reported knee instability. Additionally, effect modification between muscle strength and proprioceptive accuracy and between muscle strength and laxity was determined. Results. Self-reported knee instability was present in 67% of the knee OA patients and mainly occurred during walking. Lower muscle strength was significantly associated with the presence of self-reported knee instability, even after adjusting for relevant confounding. Impaired proprioceptive accuracy and high laxity were not associated with self-reported knee instability. No effect modification between muscle strength and proprioceptive accuracy or laxity was found. Conclusion. Lower muscle strength is strongly associated with self-reported knee instability in knee OA patients, while impairments in proprioceptive accuracy and laxity are not. A compensatory role of muscle strength for impaired proprioceptive accuracy or high laxity, in order to stabilize the knee, could not be demonstrated.

show abstract

“…[16][17][18] Here, a large variation in PF forces is apparent, especially for activities involving high knee flexion, 1 with PF forces during squatting ranging from 1.9 19 to 3.1 BW 15 at 1008 flexion. While some of the variations can be explained by variations in musculoskeletal competence and the specific joint anatomy, 20 the large spread in PF forces could also stem from oversimplified modeling assumptions and inaccurate input data. Here, the kinematics of the limb play a key role.…”

mentioning

confidence: 99%

Patellofemoral joint contact forces during activities with high knee flexion

Trepczynski

Kutzner

Kornaropoulos

et al. 2011

Journal Orthopaedic Research

View full text Add to dashboard Cite

The patellofemoral (PF) joint plays an essential role in knee function, but little is known about the in vivo loading conditions at the joint. We hypothesized that the forces at the PF joint exceed the tibiofemoral (TF) forces during activities with high knee flexion. Motion analysis was performed in two patients with telemetric knee implants during walking, stair climbing, sit-to-stand, and squat. TF and PF forces were calculated using a musculoskeletal model, which was validated against the simultaneously measured in vivo TF forces, with mean errors of 10% and 21% for the two subjects. The in vivo peak TF forces of 2.9-3.4 bodyweight (BW) varied little across activities, while the peak PF forces showed significant variability, ranging from less than 1 BW during walking to more than 3 BW during high flexion activities, exceeding the TF forces. Together with previous in vivo measurements at the hip and knee, the PF forces determined here provide evidence that peak forces across these joints reach values of around 3 BW during high flexion activities, also suggesting that the in vivo loading conditions at the knee can only be fully understood if the forces at the TF and the PF joints are considered together. ß

show abstract

Minimal Detectable Change in Quadriceps Strength and Voluntary Muscle Activation in Patients With Knee Osteoarthritis

Cited by 89 publications

References 27 publications

Effect of stimulation intensity on assessment of voluntary activation

Effect of stimulation intensity on assessment of voluntary activation

Association of lower muscle strength with self‐reported knee instability in osteoarthritis of the knee: Results from the Amsterdam Osteoarthritis Cohort

Patellofemoral joint contact forces during activities with high knee flexion

Contact Info

Product

Resources

About