Outcome Study of Highly-cross Linked Polyethylene vs. Standard Polyethylene for Primary Posterior Stabilized (PS) Total Knee

January 31, 2017 updated by: Chapel Hill Orthopedics Surgery & Sports Medicine

Prospective, Randomized Study of Highly-cross Linked Polyethylene vs. Compression Molded Polyethylene for Primary Posterior-stabilized Total Knee Arthroplasty

Polyethylene wear and osteolysis remain a concern with the use of modular, fixed bearing total knee arthroplasty. A variety of highly cross-linked polyethylenes have been introduced to decrease this problem, but there is little data on the results and complications of this polyethylene in posterior-stabilized knee prosthesis. The investigators asked the following questions: (1) Are there any differences in the clinical and radiographic results when a highly cross-lined polyethylene is compared to a standard liner? (2) What is the frequency of reoperation in these two groups and are there any specific complications related to highly cross-linked polyethylene liners.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Unknown

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

This prospective, randomized study will seek to enroll patients undergoing primary total knee arthroplasty. Preoperative evaluation will include a detailed history and physical exam with clinical data collection (SF-36, WOMAC, and Knee Society Scores), a complete description of the procedure, a demonstration of the actual types of implants and tibial inserts, and an outline of the study protocol and informed consent. Intraoperatively, the patient will undergo a total knee arthroplasty utilizing standard operative procedures. Each patient will receive a Zimmer NexGen posterior-stabilized total knee arthroplasty. During the procedure or preoperative visit, the patient will be randomized by sealed envelope to receive either a standard Zimmer UHMWPE tibial insert or a Zimmer highly cross-linked UHMWPE tibial insert. Both surgeon and patient will be blinded to the type of implant used. there will be no variations in surgical technique and hospital management of the patients throughout the course of the study. Postoperatively, the patient will be seen for routine follow-up at six weeks, 6 months, 1 year and yearly thereafter. Radiographs will be obtained at each visit. Clinical data forms will be completed at each visit. At the conclusion of the study radiographs will be assessed for signs of polyethylene wear, osteolysis and component loosening. the preoperative and postoperative knee scores will be calculated for each patient and compared between the patient groups with standard statistical analysis.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Anticipated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
500

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • North Carolina
      • Chapel Hill, North Carolina, United States, 27514
        • Chapel Hill Orthopedic Surgery and Sports Medicine

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

all female and male patients with arthritis of knee that requires total knee arthroplasty

Description

Inclusion Criteria:

  • all patients indicated for primary total posterior stabilized knee arthroplasty

Exclusion Criteria:

  • patients who refused participation
  • patients who did not comprehend the English language to give informed consent
  • patients with severe knee deformity thought to require a primary constrained condylar prosthesis

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Observational Models: Case-Control
  • Time Perspectives: Prospective

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
knee arthroplasty, standard polyethylene
total knee arthroplasty with Standard Compression Molded tibial Polyethylene Liner
Device: knee arthroplasty, standard polyethylene
total knee replacement follow-up; clinical and radiographic; revision rate
Other Names:
  • Zimmer
knee arthroplasty, Highly Cross-Linked (XLP) polyethylene
knee arthroplasty with Highly Cross-Linked tibial Polyethylene Liner
Device: knee arthroplasty, XLP polyethylene
total knee arthroplasty with highly crosslinked polyethylene tibial liner
Other Names:
  • Zimmer: Prolong

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Number of Participants requiring revision, or with Device Related Serious Adverse Events
Time Frame: Up to 10 years
reoperation rate; polyethylene fracture/failure rate
Up to 10 years
Radiographic osteolysis
Time Frame: up to 10 years
lucent, periarticular lesions , related to polyethylene wear
up to 10 years

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
knee scores
Time Frame: up to 10 years
Knee Society Pain and Function scores
up to 10 years
knee joint effusion
Time Frame: up to 10 years
knee joint examination
up to 10 years

Other Outcome Measures

Other Outcome Measures

For clinical trials, a planned measurement described in the protocol that is used to determine the effect of an intervention/treatment on participants. For observational studies, a measurement or observation that is used to describe patterns of diseases or traits, or associations with exposures, risk factors, or treatment. Types of outcome measures include primary outcome measure and secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
LEAS (lower extremity activity score)
Time Frame: up to 10 years
patient completed activity questionaire
up to 10 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Chapel Hill Orthopedics Surgery & Sports Medicine

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Zimmer Biomet

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Paul F Lachiewicz, MD, Chapel Hill Orthopedic Surgery and Sports Medicine

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
July 1, 2009

Primary Completion (Anticipated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
July 1, 2019

Study Completion (Anticipated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
July 1, 2019

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
June 23, 2014

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
June 26, 2014

First Posted (Estimate)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
June 30, 2014

Study Record Updates

Last Update Posted (Estimate)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
February 1, 2017

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 31, 2017

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
January 1, 2017

More Information

Terms related to this study

Keywords

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 05017.0501399RC05

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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