Active Versus Passive Motion Device Following Knee Replacement Surgery

Study Overview
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Brief Summary
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The purpose of this study is to determine how well an active motion device, Camoped, works compared to a continuous passive motion device, CPM, for rehabilitation after partial or total knee replacement. It is hypothesized that the Camoped active motion device will provide outcomes equal to or superior than the CPM. Patients undergoing either partial or total knee replacement will be given the opportunity to participate. If they elect to participate, preoperative data will be collected including demographics, measures of strength, balance and knee bending, as well as surveys regarding current physical and mental health, as well as knee function. After surgery, patients will be randomly selected to receive either the Camoped or the CPM for use during their rehabilitation. After discharge, participants will be asked to maintain a daily diary tracking their use of the assigned device, as well as their daily pain levels. At a visit 4 weeks after surgery, participants will be asked to complete a series of surveys pertaining to their health and knee function, as well as to perform tests of strength, balance and knee bending. These results will be used to determine if one device produces superior rehabilitation results following total or partial knee replacement surgery.

Detailed Description
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The purpose of this study is to determine how well an active motion device, Camoped, works compared to a continuous passive motion device, CPM, for rehabilitation after partial or total knee replacement. It is hypothesized that the Camoped active motion device will provide outcomes equal to or superior than the CPM. 110 patients will be randomized during the course of the study. Participation lasts approximately 4 weeks. Data for patients who begin the trial, but choose to drop out or are lost to follow up will not be included in analysis. Patients who have elected to undergo surgery with one of the PIs, either a total knee replacement with Dr. Richard Scott or a partial knee replacement with Dr. Wolfgang Fitz, will be informed about the study and offered participation if they meet eligibility criteria. The PI will obtain written consent in the office for those who choose to participate. For participants, demographic data including height, weight, BMI, age and sex will be collected. Additionally, sit-to-stand, knee flexion, proprioception, strength and balance testing will be performed in the office by a physical therapist. Participant responses to the SF-36 physical and mental health surveys, knee function score, KSS and WOMAC questionnaires will also be collected. Patients will be randomized to receive either the Camoped or CPM device after surgery. Patients will receive the device and its protocol for usage in the hospital following surgery. They will use the device for the duration of their hospital stay, and then take the device home. At home, patients will be asked to keep a daily diary tracking device usage as well as daily pain and medication intake. These results will be compared as part of the study analysis. When patients return for their follow-up appointment four weeks after surgery, demographic data including height, weight, BMI, age and sex will be collected. Additionally, sit-to-stand, knee flexion, proprioception, strength and balance testing will be performed in the office. Participant responses to the SF-36 physical and mental health surveys, knee function score, KSS and WOMAC questionnaires will also be collected. These measures will be compared to the preoperative results. Two-sample t-tests will be used to analyze the similarity between the two treatment groups before the intervention and to assess any differences afterwards. The Wilcoxon-Mann Whitney test will be performed as a non-parametric alternative to t-testing for any data sets found to be non-normal. Data collection and management will be the responsibility of the PIs. All adverse events will be reported as necessary.

Official Title
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A Prospective, Randomized, Controlled, Single Center Study Evaluating the Clinical Performance of CAMOPED Following Knee Replacement

Conditions
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Knee Arthroplasty

Intervention / Treatment
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* Device: CAMOPED
* Device: CPM passive motion device


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: • At least 18 years of age Undergoing unilateral knee replacement If female, not pregnant Agree to participate in the follow-up appointment Understand and sign the informed consent form Exclusion Criteria: Bilateral UKA or TKA planned Cannot use non-operated leg post-operatively to propel active motion splint, caused by neurological or muscular diseases such as complete or incomplete paralysis or other causes of weakness with an inability to bend or extend knee Loss of sensation of/in? operated or non-operated leg Received investigational articles <30 days prior to enrollment or was currently receiving investigational products or devices. Below or above knee amputations of non-operated leg Below knee amputation of operated side Chronic pain syndrome with inability to walk and/or use active or passive motion device post-operatively Patients taking chronic narcotics and/or are taking more than 10mg codeine per day, or any Hydrocodone, more than 200 mg of tramadol, or any other narcotics prescribed for moderate to severe pain Patients involved in pain clinics for chronic pain, or pain that is not related to the knee Diagnosis of knee disorder other than osteoarthritis, post-traumatic osteoarthritis, gout, pseudo gout Inability to walk due to disorders unrelated to the knee (e.g., hip disorders, spinal stenosis, paralysis, hemiparalysis)

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: active motion device<br>An active motion device (CAM) known as a CAMOPED was given after surgery. The device was used for 3 sessions of 20 minutes for 3 weeks. | Device: CAMOPED<br>* Camoped given after surgery<br>|
| Active Comparator: CPM passive motion device<br>A continuous passive motion device (CPM) given after surgery. The device bends and moved the knee passively. It was used for 4 hours daily for 3 weeks. | Device: CPM passive motion device<br>* passive motion device given after surgery<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Early Functional Outcome Strength | Quadriceps strength measurements using a hand held dynamometer | 4-6 weeks post-op | 
| Early Functional Outcome by Sit to Stand Test | Sit-to-Stand test: After one demonstration of the sit-to-stand test, standing up from a seated position without support, two tests were timed and the better value recorded. Patient was asked to sit with back against chair and told to stand up without using any support. Arms were suggested to be folded in front of chest. Time started with recorded said Go. | 4-6 weeks post-op | 
| Early Functional Outcome Proprioception | Biodex Balance Machine Score. The system consists of a multiaxial standing platform with a maximum tilt of 20 degrees. All participants were tested on level 8, and a balance index was calculated using the time and deviation (in degrees) on the platform relative to a neutral position. The normal range for adults 54-71 is 1.79 - 3.35. Lower values indicate better/greater stability. | 4-6 weeks post-op | 
| Early Function Outcome Kinesthesia | Kinesthesia was measured by recording the angle of the flexed knee and documenting how close the patient was able to reproduce the angle with closed eyes. The differences were recorded in degrees using an 8-inch goniometer. | 4-6 weeks post op | 
| Early Functional Outcome Knee Flexion | Knee-flexion was measured using an 8-inch goniometer. | 4-6 weeks post op | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| General Mental Orthopaedic Outcome Measures | Short form 36 mental health score. The scale is measured from 0-100. 0 is the lowest or worst possible level of functioning and 100 is the highest or best possible level of functioning. | 4-6 weeks post-op | 
| General Activity Orthopaedic Outcome Measures | Western Ontario and McMaster Universities Arthritis Index is measured on a scale of 0-68. Higher scores on the WOMAC indicate worse pain, stiffness, and functional limitations. | 4-6 weeks post-op | 
| General Functional Orthopaedic Outcome Measures | Knee society score is an objective patient reported outcome survey to measure a patient's functional ability before and after knee arthroplasty. It is measured on a scale of 1-100. A score between 80-100 indicated excellent functioning, a score between 70-79 indicates good functioning, a score between 60-69 indicates fair functioning, and a score below 60 indicates poor functioning. | 4-6 weeks post-op | 
| General Pain | Self-reported total pain medication consumption was recorded by patients and at the end of the four-week period converted into standard units for comparison as oxycodone equivalent dosage. | 4-6 weeks post-op | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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CPM, Knee, Arthroplasty, Camoped, Active vs Passive Motion Device