Trial of Essential Amino Acid Supplementation in Protein Deficient Patients Following Total Knee Arthroplasty

Study Overview
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Brief Summary
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The goal of this trial is to assess the efficacy of essential amino acids (EAA) on muscle atrophy and malnutrition compared to a placebo in patients following a total knee arthroplasty. The investigators specific objectives included analysis of (1) muscle strength, (2) change in malnutrition, (3) perioperative complications (4) physical activity.

Detailed Description
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Three orthopedic surgeons will participate in the study (MBC, DJM, SAJ). The surgical procedure will be performed as per each surgeon's routine practice. Patients will be asked to ingest 20g of EAA or placebo two times a day between meals 1 week prior and 2 weeks postoperatively. Patients will be given a pill organizer that has two doses per day with either EAA or placebo. Thigh circumference will be measured at baseline, 2 weeks and 6 weeks post-operatively. The mid-thigh measurement will be taken while the patient stands erect with their feet slightly apart and their weight equally distributed. The girth measurement is taken perpendicular to the long axis of the thigh. The tape measure will be placed at the level midway between the trochanterion and tibiale laterale sites each time to ensure that the same location is measured each time. The investigators will measure strength using a handheld dynamometer and performing a straight leg raise and knee extension at 90 degrees on the operative and the non-operative leg preoperatively, 2 weeks and 6 weeks post-operatively. The medial and lateral epicondyles of the femur will be used to position the subject's knee joint through the axis of rotation on the dynamometer. Strength will be tested at 30, 45 and 60 degrees of flexion. Physical activity will be collected using the Knee Society Score at baseline and at 6 weeks postoperatively. After the trial is commenced, there will be no additional enrollment once study numbers have been met.

Official Title
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Randomized Control Trial of Essential Amino Acid Supplementation in Protein Deficient Patients Following Total Knee Arthroplasty

Conditions
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Quad Atrophy

Intervention / Treatment
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* Drug: Amino Acid
* Other: Placebo


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: All patients will be undergoing a primary unilateral total knee arthroplasty for a diagnosis of osteoarthritis Exclusion Criteria: All patients who were wheelchair bound preoperatively All patients who cannot participate in an outpatient physical therapy program for 3 days per week after surgery

Ages Eligible for Study
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Minimum Age: 40 Years
Maximum Age: 100 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: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Amino Acid<br>Patients will be asked to ingest 20g of EAA o two times a day between meals 1 week prior and 2 weeks postoperatively. | Drug: Amino Acid<br>* Treatment arm<br>|
| Placebo Comparator: Placebo<br>Patients will be asked to ingest 20g of placebo two times a day between meals 1 week prior and 2 weeks postoperatively. | Other: Placebo<br> <br> |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change Quad Strength | As Measured by Quad circumference in inches | Change between preop and 6 weeks. | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Total Knee Arthroplasty