Ignite Creation Date:
2024-05-05 @ 12:09 PM
Last Modification Date:
2024-10-26 @ 9:21 AM
Study NCT ID:
NCT00256958
Status:
UNKNOWN
Last Update Posted:
2008-05-13
First Post:
2005-11-20
Brief Title:
Static and Dynamic Balance in Correlation With Quality of Life in Primary Total Knee Replacement
Sponsor:
Hadassah Medical Organization
Organization:
Hadassah Medical Organization
Study Overview
Official Title:
Static and Dynamic Balance During Standing and Walking in Correlation With Quality of Life in Primary Total Knee Replacement
Status:
UNKNOWN
Status Verified Date:
2005-11
Last Known Status:
RECRUITING
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
Knee osteoarthritis OA is one of the most prevalent musculoskeletal complaints worldwide affecting 30-40 of the population by the age of 65 yrIndividuals with knee OA suffer progressive loss of functionBalance is an integral component of these and many other activities of daily living Individuals with knee OA display impairment in postural control mostly under dynamic testing condition Total knee replacement TKR has an established place in the treatment of knee osteoarthritis and is considered to be an effective interventionIt remains unknown whether TKR impact significantly at balance state of the patients with OA and whether improving in functional abilities after TKR correlates with balance control ability in this populationThe purpose of this study is to determine whether TKR have any effects on relatively new postural control measures using force platform system - Balance master in correlation with functional balance assessment
Methods
Participants During a year of prospective study we plan to recruit 150 participants with symptomatic OA of the knee hospitalizing in orthopedic department of Hadassah Hospital for primary TKR Participants will undergo evaluation just before a surgery and a year afterThey will be asked to perform Balance Master measurements ambulation and balance tests Additional information will be collected through a questionnaire and physical examination
Methods
Participants During a year of prospective study we plan to recruit 150 participants with symptomatic OA of the knee hospitalizing in orthopedic department of Hadassah Hospital for primary TKR Participants will undergo evaluation just before a surgery and a year afterThey will be asked to perform Balance Master measurements ambulation and balance tests Additional information will be collected through a questionnaire and physical examination
Detailed Description:
Balance Master Testing
The Pro Balance Master system with software version 8 will be used in the study The Pro Balance Master system is comprised of two 23cm 46cm dual force plates connected at the midline of the anterioposterior axis by a pin joint Each force plate is mounted on a pair of symmetrically positioned force transducers The four transducers measure vertical ground reaction forces which form the basis of subsequent calculations of center of pressure COP and center of gravity COG sway angels All test data are acquired and then stored on a PC
Subjects are instructed to remove their shoes and step onto the forceplates which have to be covered with tracing paper Their feet are positioned by aligning the lateral border of the foot with the appropriate height line marked on the forceplates ie short 76 to 140 cm medium 141 to 165cm or tail 166 to 203cm The medial maileoli are aligned with the transverse forceplate line and subjects adopted a comfortable amount of forefoot splay The outline of their feet is traced onto paper to ensure the same placement in subsequent testing sessions The visual display monitor is adjusted to the subjects eye level Subjects are instructed not to move their feet and are asked to stand with their arms at their sides throughout the testing procedure The standard test suite protocol will be administered consisting of 6 tests 3 of which are static and 3 dynamic The static tests require the subject to look straight ahead while standing as still as possible initially with eyes open then with eyes closed and finally focusing on the display monitor using visual feedback to maintain the position of a cursor representing the subjects COG within a centrally positioned target box For each test data relating to postural sway is recorded for a period of 20 seconds and the area of the sway is calculated and expressed as a percentage of the subjects theoretical limits of stability LOS Assuming that movement about the ankle with a fixed foot position resembles an inverted pendulum these limits are defined as extending 625 anteriorly 445 posteriorly and 800 to each side 2 and delimit the area over which the COG can safely move without changing the base of support
All three dynamic tests require subjects to shift their COG The first dynamic test involves rhythmic weight shifting side to side to 50 of the LOS at 3-second then 2-second pacing Subjects are instructed to match the timing and movement of a bail on the screen by shifting their body weight side to side to target lines denoted on the screen The second test is similar to the first except movement was now in an anterioposterior direction Data reflecting the average magnitude of the movement path expressed as a percentage of the LOS are produced from six trials at each pace for each movement direction The absolute error relative to the targets set at 50 of the LOS is calculated by subtracting 50 from the score obtained 50 indicating perfect execution and recording it in absolute terms
The final dynamic test involved weight shifting to 8 targets positioned in an ellipse the perimeter of which corresponded to 75 of the LOS The subjects are required to follow a ball to each target as it is highlighted and remain at that target for 3 seconds before returning to the central target neutral
Targets are highlighted in random order but each target is selected only once The maximum allowable movement time to reach a target is 8 seconds The average movement time and path sway in terms of percentage of the LOS is determined across targets A score of 100 indicated that no path deviation had occurred ie perfect execution It should be noted that the processing of the data to produce the outcome measures described above is hard coded by NeuroComª
Main Outcome Measures
Oxford Knee Score OKS The OKS is a self-completed patient based outcome score It is a 12 item self-completed patient based outcome score The questionnaire was developed from patient interview and validated against two generic health scales the SF-36 and Health Assessment Questionnaire HAQ 44 It was originally intended for use in large randomised controlled trials for patients undergoing total knee replacement to assess levels of and changes in pain and function of the knee solely from the patients viewpoint Data collection can be via a postal questionnaire or by directed interview
Visual Analog Scale VASThe severity of knee pain is evaluated by the VAS 45 after patients remain in a weight-bearing position walking or standing for 5 minutes in the parallel bars The VAS instrument consisted of horizontal lines 10cm long with anchor points of 0 no pain and 10 maximum pain
Four Square Step Test FSST FSST is a clinical measure of rapid stepping and obstacle avoidance The equipment required for the FSST includes a stopwatch and 4 canes The square is formed by using 4 canes resting flat on the floor Canes are 90cm long and the direction and type of handle used is not important The subject stands in square number 1 facing square number 2 The aim is to step as fast as possible into each square in the following sequence Square number 2 3 4 1 4 3 2 and 1 This sequence requires the subject to step forward backward and sideway to the right and left The score is recorded as the time taken to complete the sequence The stopwatch starts when the first foot contacts the floor in square 2 and finishes when the last foot comes back to touch the floor in square 1 The following instructions are given to the subject Try to complete the sequence as fast as possible without touching the sticks Both feet must make contact with the floor in each square If possible face forward during the entire sequence The sequence is then shown to the subject
One practice trial is completed to ensure the subject knows the sequence Two FSST are completed with the best time taken as the score A trial is repeated if the subject fails to complete the sequence successfully loses balance or makes contact with a cane during the sequence Subjects who were unable to face forward during the entire sequence and needed to turn before stepping into the next square were still given a score All subjects wore their preferred shoes The examiner stood in a position to see all steps taken by the subject and an assistant provided the subject with close supervision The entire test including giving instructions and a practice trial took less than 5 minutes to complete
Time Up and Go test TUG Subjects are required to stand up from a chair with armrests walk 3m turn around return to the chair and sit down The time taken to complete this task is measured in seconds with a stopwatch 47 The TUG test showed a high degree of test-retest reliability in TUG scores in elderly subjects
SF-36 This is a 36-item questionnaire which measures health functioning on eight scales including a physical functioning scale and is among the most widely used measures of quality of life in studies of patients and populations Missing data and scoring procedures followed the SF-36 user guidelines
The Pro Balance Master system with software version 8 will be used in the study The Pro Balance Master system is comprised of two 23cm 46cm dual force plates connected at the midline of the anterioposterior axis by a pin joint Each force plate is mounted on a pair of symmetrically positioned force transducers The four transducers measure vertical ground reaction forces which form the basis of subsequent calculations of center of pressure COP and center of gravity COG sway angels All test data are acquired and then stored on a PC
Subjects are instructed to remove their shoes and step onto the forceplates which have to be covered with tracing paper Their feet are positioned by aligning the lateral border of the foot with the appropriate height line marked on the forceplates ie short 76 to 140 cm medium 141 to 165cm or tail 166 to 203cm The medial maileoli are aligned with the transverse forceplate line and subjects adopted a comfortable amount of forefoot splay The outline of their feet is traced onto paper to ensure the same placement in subsequent testing sessions The visual display monitor is adjusted to the subjects eye level Subjects are instructed not to move their feet and are asked to stand with their arms at their sides throughout the testing procedure The standard test suite protocol will be administered consisting of 6 tests 3 of which are static and 3 dynamic The static tests require the subject to look straight ahead while standing as still as possible initially with eyes open then with eyes closed and finally focusing on the display monitor using visual feedback to maintain the position of a cursor representing the subjects COG within a centrally positioned target box For each test data relating to postural sway is recorded for a period of 20 seconds and the area of the sway is calculated and expressed as a percentage of the subjects theoretical limits of stability LOS Assuming that movement about the ankle with a fixed foot position resembles an inverted pendulum these limits are defined as extending 625 anteriorly 445 posteriorly and 800 to each side 2 and delimit the area over which the COG can safely move without changing the base of support
All three dynamic tests require subjects to shift their COG The first dynamic test involves rhythmic weight shifting side to side to 50 of the LOS at 3-second then 2-second pacing Subjects are instructed to match the timing and movement of a bail on the screen by shifting their body weight side to side to target lines denoted on the screen The second test is similar to the first except movement was now in an anterioposterior direction Data reflecting the average magnitude of the movement path expressed as a percentage of the LOS are produced from six trials at each pace for each movement direction The absolute error relative to the targets set at 50 of the LOS is calculated by subtracting 50 from the score obtained 50 indicating perfect execution and recording it in absolute terms
The final dynamic test involved weight shifting to 8 targets positioned in an ellipse the perimeter of which corresponded to 75 of the LOS The subjects are required to follow a ball to each target as it is highlighted and remain at that target for 3 seconds before returning to the central target neutral
Targets are highlighted in random order but each target is selected only once The maximum allowable movement time to reach a target is 8 seconds The average movement time and path sway in terms of percentage of the LOS is determined across targets A score of 100 indicated that no path deviation had occurred ie perfect execution It should be noted that the processing of the data to produce the outcome measures described above is hard coded by NeuroComª
Main Outcome Measures
Oxford Knee Score OKS The OKS is a self-completed patient based outcome score It is a 12 item self-completed patient based outcome score The questionnaire was developed from patient interview and validated against two generic health scales the SF-36 and Health Assessment Questionnaire HAQ 44 It was originally intended for use in large randomised controlled trials for patients undergoing total knee replacement to assess levels of and changes in pain and function of the knee solely from the patients viewpoint Data collection can be via a postal questionnaire or by directed interview
Visual Analog Scale VASThe severity of knee pain is evaluated by the VAS 45 after patients remain in a weight-bearing position walking or standing for 5 minutes in the parallel bars The VAS instrument consisted of horizontal lines 10cm long with anchor points of 0 no pain and 10 maximum pain
Four Square Step Test FSST FSST is a clinical measure of rapid stepping and obstacle avoidance The equipment required for the FSST includes a stopwatch and 4 canes The square is formed by using 4 canes resting flat on the floor Canes are 90cm long and the direction and type of handle used is not important The subject stands in square number 1 facing square number 2 The aim is to step as fast as possible into each square in the following sequence Square number 2 3 4 1 4 3 2 and 1 This sequence requires the subject to step forward backward and sideway to the right and left The score is recorded as the time taken to complete the sequence The stopwatch starts when the first foot contacts the floor in square 2 and finishes when the last foot comes back to touch the floor in square 1 The following instructions are given to the subject Try to complete the sequence as fast as possible without touching the sticks Both feet must make contact with the floor in each square If possible face forward during the entire sequence The sequence is then shown to the subject
One practice trial is completed to ensure the subject knows the sequence Two FSST are completed with the best time taken as the score A trial is repeated if the subject fails to complete the sequence successfully loses balance or makes contact with a cane during the sequence Subjects who were unable to face forward during the entire sequence and needed to turn before stepping into the next square were still given a score All subjects wore their preferred shoes The examiner stood in a position to see all steps taken by the subject and an assistant provided the subject with close supervision The entire test including giving instructions and a practice trial took less than 5 minutes to complete
Time Up and Go test TUG Subjects are required to stand up from a chair with armrests walk 3m turn around return to the chair and sit down The time taken to complete this task is measured in seconds with a stopwatch 47 The TUG test showed a high degree of test-retest reliability in TUG scores in elderly subjects
SF-36 This is a 36-item questionnaire which measures health functioning on eight scales including a physical functioning scale and is among the most widely used measures of quality of life in studies of patients and populations Missing data and scoring procedures followed the SF-36 user guidelines
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
None
Is a FDA Regulated Device?:
None
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
None