- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT06130956
The Effect of a 2-week Preoperative Vegan Diet Versus Omnivorous Diet on the Protein Turnover in the Osteoarthritic Knee (KneeT-vegan)
Rationale: Protein from plant-based foods may be unable to stimulate protein synthesis due to a suboptimal essential amino acid content and a lower digestibility. However, a more optimal amino acid profile may be achieved by increasing portions sizes and blending multiple plant-based sources. Studies investigating the anabolic properties of vegan diets (total elimination of animal-based foods) rather than single plant-based foods in older adults are scarce. It remains unknown if a vegan diet can also affect protein synthesis rates in other musculoskeletal tissues than muscle.
Primary objective: To assess the effects of a 2-week preoperative vegan diet in comparison to an omnivorous diet on protein synthesis rates in Hoffa's fat pad, synovium, tendon, bone, ligaments, menisci, and cartilage in older adults with knee osteoarthritis undergoing total knee arthroplasty.
Secondary objective: To assess the effects of a 2-week preoperative vegan diet in comparison to an omnivorous diet on blood pressure and plasma amino acids in older adults with knee osteoarthritis undergoing total knee arthroplasty.
Study design: Multi-center, randomized, controlled trial with an intervention and a control group.
Study population: 40 older adults (60 - 80 years) with osteoarthritis of the knee undergoing total knee replacement.
Intervention: Controlled vegan diet versus controlled omnivorous diet, for a duration of 14 days.
Main study parameters/endpoints: Primary study parameters are protein synthesis rates of Hoffa's fat pad, synovium, tendon, bone, ligament, menisci, and cartilage. Secondary parameters include blood pressure and plasma amino acids.
Study Overview
Status
Conditions
Intervention / Treatment
Study Type
Enrollment (Estimated)
Phase
- Not Applicable
Contacts and Locations
Study Contact
- Name: Lisette de Groot, PhD
- Email: lisette.degroot@wur.nl
Study Contact Backup
- Name: Inge Groenendijk, PhD
- Phone Number: +31628748271
- Email: inge.groenendijk@wur.nl
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
- Adult
- Older Adult
Accepts Healthy Volunteers
Description
Inclusion Criteria:
- Written informed consent;
- Patients scheduled for total knee arthroplasty;
- BMI between 20-32 kg/m2;
- Aged 60 - 80 years;
- Mentally competent, as judged by the treating physician;
Exclusion Criteria:
- Following a vegetarian or vegan diet or a diet that affects protein intake during the six months prior to the study;
- Participating in a structured exercise training program in the past three months;
- Lost more than 4 kg body weight during three months prior to the study;
- Chronic use of medications that affect protein metabolism (i.e. systemic corticosteroids, or prescription strength acne medications);
- Being diagnosed with one of the following: diabetes mellitus, rheumatoid arthritis, peripheral artery disease Fontaine III or IV, COPD GOLD III or IV, neoadjuvant chemotherapy or radiotherapy, phenylketonuria, collagen disorders (e.g. Marfan and Ehler-Danlos);
- Alcohol abuse;
- Surgical intervention to the knee in the past four weeks;
- Total parenteral nutrition at day of surgery;
- Glomerular filtration rate (GFR) <20 mL/min/1.73 m2;
- Allergic or intolerant to any product included in the diets;
- Osteoarthritis of the knee secondary to septic arthritis, osteonecrosis, fracture, osteochondritis dissecans, or malignant processes;
- Any other medical condition that may interfere with the safety of the participants or the outcome parameters, in the investigators judgement;
- Not willing to stop nutritional supplements, with the exception of vitamin D and supplements on medical advice.
- Investigator's uncertainty about the willingness or ability of the participant to comply with the protocol instructions;
- Participation in other studies that may have an impact on the outcomes during the three months before the start of the current study.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Treatment
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Vegan group
Subjects in the vegan group will receive a vegan diet during the 2-week preoperative period.
|
Vegan diet for 2 weeks before surgery
|
Active Comparator: Omnivorous group
Subjects in the omnivorous group will receive an omnivorous diet during the 2-week preoperative period.
|
Omnivorous diet for 2 weeks before surgery
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Change in tissue-specific protein synthesis rates
Time Frame: During the 2-week preoperative period
|
Tissue-specific protein synthesis rates in the knee using D2O dosing methodology
|
During the 2-week preoperative period
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Change in blood pressure
Time Frame: Measured at baseline and 1 day before surgery
|
Blood pressure measurement using an CE-certified ambulatory blood pressure monitor
|
Measured at baseline and 1 day before surgery
|
Change in plasma amino acids
Time Frame: During the 2-week preoperative period
|
Difference in circulating concentrations between the two diets.
In addition, it will be investigated if plasma amino acids can be used as a marker for dietary intake.
|
During the 2-week preoperative period
|
Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Lisette de Groot, PhD, Wageningen University
Study record dates
Study Major Dates
Study Start (Estimated)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 2022023
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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