Frequency content asymmetry of the isokinetic curve between ACL deficient and healthy knee

Tsepis, Εlias; Giakas, Giannis; Vagenas, George; Georgoulis, Anastasios D.

doi:10.1016/j.jbiomech.2003.11.009

Cited by 54 publications

(64 citation statements)

References 46 publications

(62 reference statements)

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“…12 This injury frequently results in knee joint instability, muscle weakness, and neuromuscular control deficits of the involved limb. 6,40,44 In an attempt to restore these deficits and safely return patients to preinjury activities, reconstruction of the ACL is commonly performed. 10,17 Current rehabilitation programs following ACL reconstruction (ACLR) emphasize early weight-bearing activities, restoration of knee range of motion, and muscle strength.…”

mentioning

confidence: 99%

Asymmetries in Functional Hop Tests, Lower Extremity Kinematics, and Isokinetic Strength Persist 6 to 9 Months Following Anterior Cruciate Ligament Reconstruction

Xergia

Pappas²,

Zampeli³

et al. 2013

J Orthop Sports Phys Ther

122

131

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mentioning

confidence: 99%

Asymmetries in Functional Hop Tests, Lower Extremity Kinematics, and Isokinetic Strength Persist 6 to 9 Months Following Anterior Cruciate Ligament Reconstruction

Xergia

Pappas²,

Zampeli³

et al. 2013

J Orthop Sports Phys Ther

122

131

View full text Add to dashboard Cite

“…Possible signals that could be analyzed from a walking pattern include the joint angular movement patterns of the ankle, knee, and hip or the ground reaction forces produced during the stance phase. Frequency domain analysis of the ground reaction forces (GRF) that are produced as forces applied against the ground during the stance phase of walking has previously been used to assess healthy and pathological gait and has proven to be effective in outlining differences between such populations (Stergiou et al, 2002, Giakas et al, 1996, Tsepis et al, 2004). Stergiou et al (2002) investigated the frequency domain in an elderly population and found significantly decreased frequency content in the anterior-posterior direction compared to the healthy young controls.…”

Section: Introductionmentioning

confidence: 99%

Multiple sclerosis affects the frequency content in the vertical ground reaction forces during walking

Wurdeman

Huisinga

Filipi

et al. 2011

Clinical Biomechanics

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Background-Multiple sclerosis is a progressive neurological disease that results in a high incident of gait disturbance. Exploring the frequency content of the ground reaction forces generated during walking may provide additional insights to gait in patients with multiple sclerosis that could lead to specific tools for differential diagnosis. The purpose of this study was to investigate differences in the frequency content of these forces in an effort to contribute to improved clinical management of this disease.

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“…However, the characteristics of quadriceps insufficiency have not been well described 18, 53 , for the group as a whole or specified for ACL deficient subjects classified as potential copers and non-copers 12 . Isokinetic dynamometry is the predominate method for quadriceps muscle strength evaluation both in healthy individuals and after ACL injury 1, 8, 22, 27, 31, 41, 58 .…”

Section: Introductionmentioning

confidence: 99%

Anterior Cruciate Ligament—Deficient Potential Copers and Noncopers Reveal Different Isokinetic Quadriceps Strength Profiles in the Early Stage after Injury

Eitzen

Holm

et al. 2010

Am J Sports Med

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Background Isokinetic muscle strength tests using the peak torque value is the most frequently included quadriceps muscle strength measurement for anterior cruciate ligament (ACL) injured subjects. Aims The purpose of this study was to investigate quadriceps muscle performance during the whole isokinetic curve in ACL deficient subjects classified as potential copers or non-copers, and investigate whether these curve profiles were associated with single-leg hop performance. We hypothesized that quadriceps muscle torque at other knee flexion angles than peak torque would give more information about quadriceps muscle strength deficits. Furthermore, we hypothesized that there would be significant torque differences between potential copers and non-copers, and a significant relationship between angle specific torque values and single-leg hop performance. Study Design Cross-sectional study; Level of evidence, 2 Methods Seventy-six individuals with a complete unilateral ACL rupture within the last 3 months were included. The subjects were classified into potential copers and non-copers according to the criteria from Fitzgerald et al12. Isokinetic quadriceps muscle tests were performed at 60°/sec (Biodex 6000). Mean torque values were calculated for peak torque as well as for specific knee flexion angles. The one-leg hop and the 6 meter timed hop tests were included and symmetry indices were used. Results The peak torque value did not identify the largest quadriceps muscle strength deficit. Rather, these were established at knee flexion angles of less than 40°. There were significant differences in angle specific torque values between potential copers and non-copers (p<0.05). Moderate to strong associations were disclosed between angle specific torque values and single-leg hop performance, but only for non-copers (r≥0.32– 0.58). Conclusions Angle specific quadriceps muscle torque values of less than 40° of knee flexion provide more information on the quadriceps strength deficits after ACL injury compared to the commonly used peak torque values.

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Frequency content asymmetry of the isokinetic curve between ACL deficient and healthy knee

Cited by 54 publications

References 46 publications

Asymmetries in Functional Hop Tests, Lower Extremity Kinematics, and Isokinetic Strength Persist 6 to 9 Months Following Anterior Cruciate Ligament Reconstruction

Asymmetries in Functional Hop Tests, Lower Extremity Kinematics, and Isokinetic Strength Persist 6 to 9 Months Following Anterior Cruciate Ligament Reconstruction

Multiple sclerosis affects the frequency content in the vertical ground reaction forces during walking

Anterior Cruciate Ligament—Deficient Potential Copers and Noncopers Reveal Different Isokinetic Quadriceps Strength Profiles in the Early Stage after Injury

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