Rising from chair after total knee arthroplasty

Su, Fong Chin; Lai, Kou-An; Hong, W.H.

doi:10.1016/s0268-0033(97)00039-9

Cited by 101 publications

(84 citation statements)

References 7 publications

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“…Waveforms with a flexion moment pattern are associated to the control group and distinguished from those with an extension pattern, representative of the patients' group. This is in agreement with results obtained by Su et al (22). They studied the STS movement of osteoarthritic patients and compared it with function of normal subjects and patients after successful total knee replacement.…”

Section: Discussionsupporting

confidence: 92%

“…Concerning the range of knee flexion, no other published studies have found a significant difference between osteoarthritic and healthy subjects while performing the STS movement. Nevertheless so far, the only published study on the topic of the effect of osteoarthritis in knee function during the STS movement performance is the one by (22). They just considered the maximal knee flexion angle as kinematic comparative variable between groups.…”

Section: Discussionmentioning

confidence: 99%

“…Selection of discrete variables was done according to previous literature related to STS movement analysis (18)(19)(20)(21)(22). Most authors choose peak flexion moment, initial and final flexion angles, range of flexion and total movement duration as the main scalar parameters to be considered in the study of knee biomechanics during STS movement.…”

Section: Data Processingmentioning

confidence: 99%

“…Flexion-extension moments are the most relevant moments at the knee and play a significant role in identifying functional differences or changes at this joint when studying the execution of many different daily activities (18)(19)(20)(21). Moreover, previous studies (22) have shown that variables associated to knee flexion angles and moments are the most relevant variables for identifying differences between osteoarthritic patients and healthy subjects in STS movement performance; so it is interesting to analyze the same variables from a functional point of view. Last but not least, artifacts associated to skin and soft tissues can significantly affect the accuracy of motions in coronal and frontal planes (medial-lateral motions and internal-external rotations), whereas motion in the sagittal plane as well as the related kinetic variables are more consistent or less affected by this type of measuring error (23).…”

mentioning

confidence: 99%

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Analysis of multiple waveforms by means of functional principal component analysis: normal versus pathological patterns in sit-to-stand movement

Epifanio

Ávila

Page

et al. 2008

Med Biol Eng Comput

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This paper presents an application of Functional Principal Component Analysis (FPCA) to describe inter-subject variability of multiple waveforms. This technique was applied to the study of sit-to-stand movement in two groups of people, osteoarthritic patients and healthy subjects.Although STS movement has not been much applied to the study of knee osteoarthritis, it can provide relevant information about the effect of osteoarthritis disease on knee joint function.Two waveforms, knee flexion angle and flexion moment, were simultaneously analysed. Instead of using the common multivariate approach we used the functional one, which allows working with continuous functions without neither discretization nor time scale normalization.The results show that time-scale normalization can alter the FPCA solution. Furthermore, FPCA presents a better discriminatory power compared to the classical multivariate approach. Then, this technique can be applied as a functional assessment tool, allowing the identification of relevant variables to discriminate heterogeneous groups, such as healthy and pathological subjects.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Data Processingmentioning

confidence: 99%

mentioning

confidence: 99%

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Analysis of multiple waveforms by means of functional principal component analysis: normal versus pathological patterns in sit-to-stand movement

Epifanio

Ávila

Page

et al. 2008

Med Biol Eng Comput

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“…Lower scores on tests of physical function persist at least 1 year after surgery [19,21,32] with greater dysfunction during greater strength-demanding activities such as stair climbing [4,6,12,18,32] and sit-to-stand transfers [18,31]. Tests that measure functional performance have a low correlation with perceived function when self-reported on outcome questionnaires [23].…”

Section: Introductionmentioning

confidence: 99%

The Chitranjan Ranawat Award: The Nonoperated Knee Predicts Function 3 Years after Unilateral Total Knee Arthroplasty

Farquhar

Snyder‐Mackler

2010

Clinical Orthopaedics &Amp; Related Research

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The long-term functional abilities of patients after a unilateral total knee arthroplasty (TKA) are influenced by the status of the nonoperated knee at the time of the TKA. We hypothesized that in the 3 years after TKA, the nonoperated limb would become more painful, and the quadriceps muscles would weaken; pain and strength would influence performance on functional testing by 3 years after TKA. Healthy control subjects were tested over the same time interval; we hypothesized the controls would also decline in strength and function over time. Individuals with unilateral knee pain (less than 4/10 on a verbal analog scale) were recruited preoperatively. We tested patients 1, 2, and 3 years after TKA to determine changes in strength, self-report outcome measures, and performance on a stair climbing test and the 6-minute walk test. Control subjects without osteoarthritis were tested twice, 2 years apart. The nonoperated limb of patients with TKA weakened from 1 to 2 years, and further weakened from 2 to 3 years after TKA; by 3 years after TKA, the nonoperated limb was more painful compared to the operated limb. Three years after TKA, nonoperated knee pain contributed 44% of the variability in the 6-minute walk and 33% of the variability in the stair climbing test. Patients with TKA were weaker, slower, and had lower self-report outcome measures compared with control subjects at both time intervals. Control subjects also weakened over time, yet were stable on self-report outcome measures and the 6 minute walk test. Weakening of the quadriceps muscles in all participants represents changes due to ageing; however on average the nonoperated limb weakened over time, possibly representing not only changes resulting from aging, but progression of osteoarthrosis in some patients with unilateral TKA.

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Lower‐limb joint mechanics after total hip arthroplasty during sitting and standing tasks

Lamontagne

Beaulieu

Varin

et al. 2012

Journal Orthopaedic Research

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While the effect of total hip arthroplasty on the operated limb mechanics is well documented, little is known on its effect on the contralateral limb. The purpose of this study was to measure the joint mechanics of both lower limbs during the tasks of sit-tostand and stand-to-sit. Twenty total hip arthroplasty patients and 20 control participants performed three trials of each task from which 3D lower-limb joint kinematics and kinetics were obtained. Total hip arthroplasty patients exhibited lower operated-hip joint flexion, extension moments, and power, occurring most frequently near seat-on and seat-off. Despite these reduced kinetic variables in the operated hip, the joints of the non-operated limb generated similar joint kinetics as the matched control participants. These results indicated the patients who underwent total hip arthroplasty could adopt a strategy that allowed them to reduce moments and power generated at the operated lower-limb joints without overcompensating with the non-operated leg. Although such a strategy may be desirable given that higher loads can increase friction and accelerate wear of the prosthesis, reduced loading may be an indication of inadequate muscle strength that needs to be addressed. reported that older adults stand up on average 65 times a day, making this task important to assess the overall function. Reduced lower-limb muscle strength greatly affects sit-to-stand biomechanics in healthy adults, 7,8 and since THA patients already demonstrate reduced peak torques in flexion, extension, and abduction in both operated and non-operated hips, 9 abnormal sitting and standing biomechanics and joint loading are expected. 10 This could contribute to the onset and/or development of disorders at other joints, such as the contralateral knee.11 Differences have been found in gait for hip range of motion 12 and pelvic obliquity.1 To our knowledge, no study has inquired into side differences in a sit-to-stand task. Therefore, our purpose was to measure 3D-kinematics and kinetics of lower-limb joints during sit-to-stand and standto-sit by comparing both limbs of THA patients with those of healthy, matched control participants.We hypothesized that extensor moments and powers would be lower on the operated side as compared to the control group. As asymmetries have been found in ground reaction forces for THA patients, 5 the non-operated limb was expected to have greater moments and powers at the hip and knee articulations to compensate for the operated side. For kinematics, we also hypothesized that THA patients would have a reduction in hip sagittal-plane range of motion and peak hip flexion, as this group already demonstrated this pattern during stair climbing. 13 METHODS ParticipantsTwenty patients that had THA 6-15 months prior to testing (10 men, 10 women; mean age 66.2 AE 6.7 years; mean BMI 27.2 AE 5 kg/m 2 ; mean post-operative testing 317 AE 85 days) participated. Exclusion criteria were: any surgeries at the other lower-limb joints, THA secondary to an infection, a frac...

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Rising from chair after total knee arthroplasty

Cited by 101 publications

References 7 publications

Analysis of multiple waveforms by means of functional principal component analysis: normal versus pathological patterns in sit-to-stand movement

Analysis of multiple waveforms by means of functional principal component analysis: normal versus pathological patterns in sit-to-stand movement

The Chitranjan Ranawat Award: The Nonoperated Knee Predicts Function 3 Years after Unilateral Total Knee Arthroplasty

Lower‐limb joint mechanics after total hip arthroplasty during sitting and standing tasks

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