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Completed

NCT Number: NCT01782885

Comparison of Acetaminophen and PRP Therapy for Knee OA

The purpose of this study is to test whether the platelet-rich plasma (PRP) intra-articular injection therapy is effective as an alternative treatment option in patients with mild knee osteoarthritis within a controlled randomized study compared to first line treatment acetaminophen. The investigators will evaluate patients outcome in level of pain, knee function and quality of life before the treatment and at 6, 12 and 24 weeks follow up.

The study will be complemented with in vitro experiments of human osteoarthritic cartilage explants culture (treated with PRP) for histological and gene expression assays.

PRP intra-articular injections therapy is effective in patients with mild knee osteoarthritis by modifying the biochemical joint environment and cartilage regeneration capability.

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Key information

Conditions

Knee Osteoarthritis Arthritis Joint Diseases Musculoskeletal Diseases Osteoarthritis Osteoarthritis, Knee Rheumatic Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Hospital Universitario Dr. José E. González

Monterrey, Nuevo León, 64460, Mexico

About this study

This is a randomized controled study. Patients enroled in the study will be divided into two groups (calculated n=30 per group). One group will be treated with acetaminophen (500 mg/8 h) for 6 weeks, the experimental group will receive a total of 3 intra-articular injections of PRP, one injection every 2 weeks. The intake of any other analgesic or anti-inflammatory drug will be prohibited in patients from two groups.

For those who received the infiltrations, the procedure consist of a 27-mL venous blood sample in 6 vacutainer tubes with sodium citrate 0.109 M for each injection. Samples are gently agitated to ensure mixing the anticoagulant with the blood. An extra tube with anticoagulated EDTA blood is obtained for initial platelet count. Blood samples are centrifuged for 10 minutes at 1800 rpm to separate the erythrocyte layer. The upper plasma layer is carefully collected in a new sterile propylene tube trying not to remove the leukocyte layer. Plasma from all tubes is centrifuged again for 12 minutes at 3400 rpm to obtain a two-part plasma: the upper part consisting on platelet-poor plasma and lower part consisting of platelet-rich plasma (PRP). The platelet-poor plasma is discarded to obtain a final volume of 3 mL. This volume, consisting of PRP, is mixed carefully through pipetting to resuspend platelets and it was then transferred to a new sterile glass tube. An aliquot of the final PRP is sent to the laboratory for platelet count. All open handling sample procedures are performed within a high-efficiency particulate air-filtered laminar flow hood.

Application of injections is carry out after disinfection of skin in the knee joint area. After local anesthesia with lidocaine chlorohydrate, platelets are activated using 10% calcium gluconate solution and the liquid PRP is injected in a sterile condition using a 22 G needle. The needle is inserted using the superolateral approach in an angle of approximately 45°.

Patients from PRP group will be asked to flex and extend their knees immediately after injection so that PRP could distribute adequately across the joint space. After 5-10 minutes of observation the patients are sent home with written indications including to have relative rest 24 to 48 hours after the injection, the use of cold therapy for 15 minutes three times a day and 500 mg of acetaminophen in case of pain and inflammation.

The use of NSAIDs or any steroids is prohibited. All the patients will be evaluated before the beginning of their respective treatment and at 6, 12 and 24 weeks after. Three different scales are used to evaluate clinical outcome, the VAS (Visual Analog Scale) that scores pain level, the WOMAC (Western Ontario and McMaster Universities Arthritis Index) which assesses pain, articular stiffness and functional limitation, and the Spanish (México) version of the SF-12 (Short Form-12) for assessment of quality of life.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Older than 18 years old
  • Patients who haven't received steroids injection or medical treatment 1 month before the study
  • Patients with knee osteoarthritis grade I and II (Kellgren-Lawrence scale)
  • Indistinct gender
  • Patients who accept to participate in the study with previous signed informed consent

Exclusion criteria

  • Patients with knee osteoarthritis grade III and IV (Kellgren-Lawrence scale)
  • Patients with prosthesis
  • Pregnancy
  • Patients with rheumatic diseases
  • Patients with diabetes, hepatic diseases, coagulopathy, cardiovascular diseases, immunosuppression, infections
  • Patients taking anticoagulants
  • Patients with concentrations of hemoglobin under 11 g/dL and platelets under 150,000/uL

Treatment and study plan

intra-articular injection of PRP

Procedure

Patients from this arm will receive 3 intra-articular knee injections of autologous platelet-rich plasma, one injection every two weeks (6 weeks total).

Acetaminophen

Drug

Patients from this arm will receive a dosis of acetaminophen (500 mg/8 hours) while PRP treatment lasts (6 weeks total).

Primary outcomes

  1. Change in Western Ontario and McMaster Universities Arthritis Index (WOMAC)

    Time frame: 0 weeks

    The WOMAC evaluation will be performed on patients who received the treatment at 0, 6, 12, 24 weeks after treatment is finished. The WOMAC measures five items for pain (score range 0-20), two for stiffness (score range 0-8), and 17 for functional limitation (score range 0-68). A total WOMAC score is created by summing the items for all three subscales (score range 0-96). Higher scores on the WOMAC indicate worse pain, stiffness, and functional limitations.

  2. Change in Western Ontario and McMaster Universities Arthritis Index (WOMAC)

    Time frame: 6 weeks

    The WOMAC evaluation will be performed on patients who received the treatment at 0, 6, 12, 24 weeks after treatment is finished. The WOMAC measures five items for pain (score range 0-20), two for stiffness (score range 0-8), and 17 for functional limitation (score range 0-68). A total WOMAC score is created by summing the items for all three subscales (score range 0-96). Higher scores on the WOMAC indicate worse pain, stiffness, and functional limitations.

  3. Change in Western Ontario and McMaster Universities Arthritis Index (WOMAC)

    Time frame: 12 weeks

    The WOMAC evaluation will be performed on patients who received the treatment at 0, 6, 12, 24 weeks after treatment is finished. The WOMAC measures five items for pain (score range 0-20), two for stiffness (score range 0-8), and 17 for functional limitation (score range 0-68). A total WOMAC score is created by summing the items for all three subscales (score range 0-96). Higher scores on the WOMAC indicate worse pain, stiffness, and functional limitations.

  4. Change in Western Ontario and McMaster Universities Arthritis Index (WOMAC)

    Time frame: 24 weeks

    The WOMAC evaluation will be performed on patients who received the treatment at 0, 6, 12, 24 weeks after treatment is finished. The WOMAC measures five items for pain (score range 0-20), two for stiffness (score range 0-8), and 17 for functional limitation (score range 0-68). A total WOMAC score is created by summing the items for all three subscales (score range 0-96). Higher scores on the WOMAC indicate worse pain, stiffness, and functional limitations.

Secondary outcomes

  1. Change in Visual Analog Scale (VAS)

    Time frame: 0-24 weeks

    The visual analog scale (VAS) is a psychometric response scale which measures subjective characteristics or attitudes that cannot be directly measured. When responding to a VAS item, respondents specify their current level of pain by indicating a position along a continuous line of 10 cm. Subject is asked: on a scale of 0 to 10, with 0 being no pain and 10 being the worst pain imaginable, what you rate your current pain?

Other outcomes

  1. Change in SF-12v2 Health Survey

    Time frame: 0 weeks

    The Spanish (Mexico) version of the SF-12v2 Health Survey uses 12 questions to measure functional health and well-being from the patient's point of view. All 12 items from the survey can be summarized in two main domains (physical and mental health). Physical and Mental Health Composite Scores (PCS and MCS) are computed using the scores of 12 questions and range from 0 to 100, where a zero score indicates the lowest level of health measured by the scales and 100 indicates the highest level of health.

  2. Change in SF-12v2 Health Survey

    Time frame: 6 weeks

    The Spanish (Mexico) version of the SF-12v2 Health Survey uses 12 questions to measure functional health and well-being from the patient's point of view. All 12 items from the survey can be summarized in two main domains (physical and mental health). Physical and Mental Health Composite Scores (PCS and MCS) are computed using the scores of 12 questions and range from 0 to 100, where a zero score indicates the lowest level of health measured by the scales and 100 indicates the highest level of health.

  3. Change in SF-12v2 Health Survey

    Time frame: 12 weeks

    The Spanish (Mexico) version of the SF-12v2 Health Survey uses 12 questions to measure functional health and well-being from the patient's point of view. All 12 items from the survey can be summarized in two main domains (physical and mental health). Physical and Mental Health Composite Scores (PCS and MCS) are computed using the scores of 12 questions and range from 0 to 100, where a zero score indicates the lowest level of health measured by the scales and 100 indicates the highest level of health.

  4. Change in SF-12v2 Health Survey

    Time frame: 24 weeks

    The Spanish (Mexico) version of the SF-12v2 Health Survey uses 12 questions to measure functional health and well-being from the patient's point of view. All 12 items from the survey can be summarized in two main domains (physical and mental health). Physical and Mental Health Composite Scores (PCS and MCS) are computed using the scores of 12 questions and range from 0 to 100, where a zero score indicates the lowest level of health measured by the scales and 100 indicates the highest level of health.

Sponsors and collaborators

Lead sponsor

Hospital Universitario Dr. Jose E. Gonzalez

Other

Registry information

Official study title

Comparison of Acetaminophen and Platelet-rich Plasma Therapy for the Treatment of Knee Osteoarthritis.

Important dates

Study start
2013
Primary completion
2015
Study completion
2015
First posted
Feb 4, 2013
Registry last updated
Nov 20, 2015

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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