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Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT00764673
Other study ID # PS - 703
Secondary ID
Status Completed
Phase Phase 4
First received September 30, 2008
Last updated February 8, 2011
Start date October 2006
Est. completion date October 2010

Study information

Verified date February 2011
Source Encore Medical, L.P.
Contact n/a
Is FDA regulated No
Health authority United States: Institutional Review Board
Study type Interventional

Clinical Trial Summary

The purpose of this study is to evaluate the survivorship and efficacy of the Encore 3DKnee™ system in a group of patients who will receive the 3DKnee™ as a primary (first) orthopedic implant in the knee. Each knee will be designated as a separate subject and followed for a period of 2 years.


Recruitment information / eligibility

Status Completed
Enrollment 71
Est. completion date October 2010
Est. primary completion date October 2010
Accepts healthy volunteers No
Gender Both
Age group 18 Years and older
Eligibility Inclusion Criteria:

- This must be a primary knee replacement on this knee.

- Have knee joint disease related to one or more of the following

- degenerative joint disease, including osteoarthritis or traumatic arthritis

- Avascular necrosis of the femoral condyles

- Post-traumatic loss of joint configuration, particularly when there is patellofemoral erosion, dysfunction or prior patellectomy

- Moderate valgus, varus, or flexion deformities

- Rheumatoid arthritis

- Patient is likely to be available for evaluation for the duration of the study

- Able and willing to sign the informed consent and follow study procedures

- Patient is not pregnant

- Patient must be over 18 years of age

Exclusion Criteria:

- If there has been a total knee replacement on this knee in the past (no revisions allowed in study)

- Infection, or history of infection, acute or chronic, local or systemic

- Alcoholism or other addictions

- Muscular, neurological or vascular deficiencies which compromise the affected extremity

- Obesity

- Insufficient bone quality

- Loss of ligamentous structures

- High levels of physical activity

- Materials sensitivity

- Prisoner

- Mental conditions that may interfere with the patient's ability to give an informed consent or willingness to fulfill the study requirements

- Patient is pregnant

- Is younger than 18 years of age

Study Design

Allocation: Non-Randomized, Intervention Model: Single Group Assignment, Masking: Open Label, Primary Purpose: Treatment


Intervention

Device:
3DKnee
Subjects with knee osteoarthritis and willing to participate in the study

Locations

Country Name City State
United States St. Peter's Bone & Joint Surgery St. Peters Missouri

Sponsors (1)

Lead Sponsor Collaborator
Encore Medical, L.P.

Country where clinical trial is conducted

United States, 

Outcome

Type Measure Description Time frame Safety issue
Primary Knee Society Score Evaluation The Knee Society Score includes a knee rating and function score. This evaluation covers the knee rating score with three main parameters of pain, stability and range of motion and that flexion contracture, extension lag and misalignment should be dealt with as deductions. Thus, 100 points will be obtained by a well-aligned knee with no pain, 125 degrees of motion, and negligible anteroposterior and mediolateral instability. 50 points are allotted for pain, 25 for stability, and 25 for range of motion. Grading for KS Score: Excellent (90-100), Good (80-90), Fair (70-79) and Poor (<70). 2 year No
Primary Knee Society Function Score The Knee Society Score includes a knee rating and function score. Patient function considers only walking distance and stair climbing, with deductions for walking aids. The maximum function score, which is also 100, is obtained by a patient who can walk an unlimited distance and go up and down stairs normally. Walking ability is expressed in blocks (approximately 100 meters). Stair climbing is considered normal if the patient can ascend and descend stairs without holding a railing. A score of > or = to 60 on the function score is considered success. 2-year No
Primary Number of Participants With >2mm Wide at the Bone/Cement Interface or a >3 Degree or >3 mm Migration (Shift) of the Component. Radiographic failure is defined as a complete radiolucent line > 2mm wide at the bone/cement interface or a >3 degree or >3 mm migration (shift) of the component. 2-year Yes
Primary Safety Assessment Number of device related adverse events and device failures at the 2 year time frame. 2-year Yes
Secondary Oxford Knee Score Questionnaire on the perceptions of patients about a total knee replacement. Score between 0 and 48 where: 0 to 19 may indicate severe knee arthritis, 20 to 29 may indicate moderate to severe knee arthritis, 30 to 39 may indicate mild to moderate knee arthritis and 40 to 48 may indicate satisfactory joint function. 2-year No
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