Isometric Quadriceps Strength Test Device to Improve the Reliability of Handheld Dynamometry in Patient With Anterior Cruciate Ligament Injury

McNamara, Stephanie; Hevia, Elizabeth Gallardo; Louis, Reggie St.; Cho, William; Lee, Sang-Jun; Moyne, Martina Margaret; Quinlivan, Brendan; Walsh, Conor J.; Schiller, Greg; Awad, Louis N.

doi:10.1115/dmd2018-6848

Cited by 2 publications

(4 citation statements)

References 5 publications

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“…It should be noted that the reliability of the LC, as with any device, is dependent on the set-up and therefor clinicians should be vigilant in following the set-up instructions set out in the procedures section and keep the set-up consistent when doing testing and re-testing in clinical settings, to ensure reliable results. Belt-stabilisation seems to be improving reliability in LC-based devices and are recommended to use by practitioners [25,34].…”

Section: Discussionmentioning

confidence: 99%

“…The ID (Cybex II, CSMi, Stoughton, MA, USA) was used as the gold standard for evaluating isometric muscle strength and a LC (Crane & Hanging Scale, Micro Mini CS300, Border Scales & Labels) served as the low-cost alternative to measure isometric quadriceps strength. Strength was evaluated with the knee joint at 60° of knee flexion, where peak force of the quadriceps is usually generated [25]. A digital goniometer (EasyAngle, Meloq AB, Stockholm, Sweden) was used to measure the knee angle in all instances to ensure true validity and replicability.…”

Section: Methodsmentioning

confidence: 99%

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Assessing quadriceps strength in patellofemoral pain patients: A study on the reliability and validity of a low-cost load-cell for clinical practice

Deysel,

van Aswegen,

Kramer

2024

Preprint

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Background Patellofemoral pain (PFP) is a common knee complaint affecting diverse populations both acutely and chronically. Quadriceps muscle weakness is one possible aetiology, but current devices for measuring muscle strength (isokinetic dynamometer and hand-held dynamometers) are frequently too expensive for practitioners, especially in under-resourced settings. There is a need to evaluate a low-cost device to manage rehabilitation of people with PFP. Methods Isometric quadriceps strength of participants aged 18-35 years (total [n = 33], control group [n = 17] and PFP group [n = 16]) were evaluated on an isokinetic dynamometer and a low-cost load cell at baseline and after an 8-week non-standardised intervention for validity scores. Results The load cell showed high absolute and relative reliability (intraclass correlation coefficient = 0.89-0.99; typical error of measurement = 3.9-10.4%). Clinically meaningful difference scores (12.2-45 Nm) were greater than the typical error of measurement, implying sufficient sensitivity of the load cell to measure true changes in isometric quadricep strength. Strong to very strong correlations were evident between the load cell and isokinetic dynamometer torque measurements (r = 0.88-0.90, SEE = 0.05-0.07 Nm), but slope values (β = 0.65-0.77) indicated that torque from the load cell was typically lower than that obtained from the isokinetic dynamometer. An average systematic bias of 16.3-28.8 Nm was evident in favour of the isokinetic dynamometer, with no statistically significant between-group differences being noted between the baseline and follow-up testing. Conclusion The load cell is a reliable instrument, sensitive enough to detect clinically meaningful differences in quadriceps strength in healthy individuals and those with PFP. The load cell lacks validity and cannot replace isokinetic dynamometry. Given the low cost and excellent reliability, the load cell can be a valuable tool to assess quadriceps muscle deficits and track rehabilitation progress in people with PFP.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Assessing quadriceps strength in patellofemoral pain patients: A study on the reliability and validity of a low-cost load-cell for clinical practice

Deysel,

van Aswegen,

Kramer

2024

Preprint

View full text Add to dashboard Cite

show abstract

“…It should be noted that the reliability of the SG, as with any device, is dependent on the set-up and therefore clinicians should be vigilant in following the set-up instructions set out in the procedures section and keep the set-up consistent when doing testing and re-testing in clinical settings, to ensure reliable results. Belt-stabilisation seems to improve reliability in SG-based devices and is recommended for use by practitioners [ 26 , 35 ].…”

Section: Discussionmentioning

confidence: 99%

“…The ID (Cybex II, CSMi, Stoughton, MA, USA) was used as the gold standard for evaluating isometric muscle strength and a SG (Crane & Hanging Scale, Micro Mini CS300, Border Scales & Labels) served as the low-cost alternative to measure isometric quadriceps strength. Strength was evaluated with the knee joint at 60° of knee flexion, where peak force of the quadriceps is usually generated [ 26 ]. A digital goniometer (EasyAngle, Meloq AB, Stockholm, Sweden) was used to measure the knee angle in all instances to ensure true validity and replicability.…”

Section: Methodsmentioning

confidence: 99%

Assessing quadriceps strength in patellofemoral pain patients: A study on the reliability and validity of a low-cost strain-gauge for clinical practice

Deysel,

van Aswegen,

Kramer

2024

PLoS ONE

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Background Patellofemoral pain (PFP) is a common knee complaint affecting diverse populations both acutely and chronically. Quadriceps muscle weakness is one possible aetiology, but current devices for measuring muscle strength (isokinetic dynamometer [ID] and hand-held dynamometers [HHD]) are frequently too expensive (e.g., ID) or lack reliability (e.g., HHD) for practitioners, especially in under-resourced settings. There is a need to evaluate a low-cost device to manage rehabilitation of people with PFP. Methods Isometric quadriceps strength of participants aged 18–35 years (total [n = 33], control group [n = 17] and PFP group [n = 16]) were evaluated on an isokinetic dynamometer and a commercially available strain gauge at baseline and after an 8-week non-standardised intervention. Results The strain gauge showed high absolute and relative reliability (intraclass correlation coefficient = 0.89–0.99; typical error of measurement = 3.9–10.4%). Clinically meaningful difference scores (12.2–45 Nm) were greater than the typical error of measurement, implying sufficient sensitivity of the strain gauge to measure true changes in isometric quadricep strength. Strong to very strong correlations were evident between the strain gauge and isokinetic dynamometer torque measurements (r = 0.88–0.90, SEE = 0.05–0.07 Nm), but slope values (β = 0.65–0.77) indicated that torque from the strain gauge was lower than that obtained from the isokinetic dynamometer. An average systematic bias of 16.3–28.8 Nm was evident in favour of the isokinetic dynamometer, with no statistically significant between-group differences apparent between baseline and follow-up testing. Conclusion The present commercially available strain gauge is reliable and sensitive enough to detect clinically meaningful differences in quadriceps strength of both healthy individuals and those with PFP. However, the strain gauge lacks validity and therefore cannot replace isokinetic dynamometry. Given the low cost and excellent reliability, the strain gauge can be a valuable tool to assess quadriceps muscle deficits and track rehabilitation progress in people with PFP.

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Isometric Quadriceps Strength Test Device to Improve the Reliability of Handheld Dynamometry in Patient With Anterior Cruciate Ligament Injury

Cited by 2 publications

References 5 publications

Assessing quadriceps strength in patellofemoral pain patients: A study on the reliability and validity of a low-cost load-cell for clinical practice

Assessing quadriceps strength in patellofemoral pain patients: A study on the reliability and validity of a low-cost load-cell for clinical practice

Assessing quadriceps strength in patellofemoral pain patients: A study on the reliability and validity of a low-cost strain-gauge for clinical practice

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