A Prospective Study to Evaluate the ConforMIS iTotal® (PS) Knee Replacement System

October 23, 2023 updated by: Restor3D
This is a prospective clinical study designed to observe the long-term clinical outcomes of total knee arthroplasty using a patient-specific, posterior stabilized implant in patients with osteoarthritis.

Study Overview

Status

Status

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

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

The study is prospective. Subjects will be implanted with an iTotal® PS Knee Replacement System. The study will include a minimum of 100 subjects across up to 10 sites. The patients enrolled in this study may represent the first cases of the iTotal PS KRS implanted at a particular site; data collected for the first 15 patients at each site will be analyzed separately from the rest of the enrolled population. This will provide visibility towards determining if there exists a learning curve in the implantation process of the iTotal PS KRS. The study sites will be located in the United States.

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 (Actual)

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.
102

Contacts and Locations

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

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • United States
    • North Carolina
      • Chapel Hill, North Carolina, United States, 27599
        • UNC Orthopedics
    • Texas
      • Austin, Texas, United States, 78751
        • Texas Institute for Hip & Knee Surgery
    • Vermont
      • Morrisville, Vermont, United States, 05661
        • Mansfield Orthopaedics
    • West Virginia
      • Huntington, West Virginia, United States, 25702
        • Scott Orthopedic

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

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Sampling Method

Non-Probability Sample

Study Population

Patients with osteoarthritis of the knee

Description

Inclusion Criteria:

  • Clinical condition included in the approved Indications For Use for the iTotal® PS
  • Osteoarthritis, as confirmed by the investigator's assessment of disease status at screening visit that warrants a TKR procedure. Disease status is assessed by Clinical and Radiographic assessment.
  • Willingness to participate in the clinical study, to give informed consent, and to attend all follow-up visits
  • > 18 years of age

Exclusion Criteria:

  • Simultaneous bilateral procedure required
  • BMI > 40
  • Active malignancy (defined as a history of any invasive malignancy - except non- melanoma skin cancer), unless patient has been treated with curative intent and there have been no clinical signs or symptoms of the malignancy for at least 5 years
  • Poorly controlled diabetes
  • Neuromuscular conditions which prevent patient from participating in study activities
  • Active local or systemic infection
  • Immunocompromised
  • Fibromyalgia or other general body pain related condition
  • Rheumatoid arthritis or other forms of inflammatory joint disease
  • Loss of bone or musculature, osteonecrosis, neuromuscular or vascular compromise in the area of the joint to be operated on, to an extent that the procedure is unjustified
  • Diagnosed with or receiving treatment for Osteoporosis
  • Other physical disability affecting the hips, spine, or contralateral knee
  • Severe instability due to advanced loss of osteochondral structure
  • Prior arthroplasty of the affected knee, including High Tibial Osteotomy (HTO)
  • Unwilling or unable to comply with study requirements
  • Participation in another clinical study which would confound results
  • Allergy to any of the implant materials

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

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
Change in Baseline from 1-Year in KSS
Time Frame: 2 Years
Change in Knee Society Scores from the pre-operative visit to the 1-year post-operative visit. The Knee Society Score (KSS) includes an Objective Knee Score, Function Score, Satisfaction Score, and Expectation Score. The objective knee score, completed by the surgeon, includes a VAS score of pain walking on level ground and on stairs or inclines, as well as an assessment of alignment, ligament stability, and ROM, along with deductions for flexion contracture or extensor lag. Patients then record their satisfaction, functional activities, and expectations (Scuderi et al., 2012).
2 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
Change from baseline in KSS at years 2, 5 and 10 post-implantation
Time Frame: Up to 10 years
The Knee Society Score includes an Objective Knee Score, Function Score, Satisfaction Score, and Expectation Score. The Knee Society Score (KSS) includes an Objective Knee Score, Function Score, Satisfaction Score, and Expectation Score. The objective knee score, completed by the surgeon, includes a VAS score of pain walking on level ground and on stairs or inclines, as well as an assessment of alignment, ligament stability, and ROM, along with deductions for flexion contracture or extensor lag. Patients then record their satisfaction, functional activities, and expectations (Scuderi et al., 2012).
Up to 10 years
Change from baseline in KOOS at years 1, 2, 5 and 10 post-implantation
Time Frame: Up to 10 years
The Knee Injury and Osteoarthritis Outcome Score (KOOS) is a 42 question knee-specific instrument, developed to assess the patients' opinion about their knee and associated problems.
Up to 10 years
Post-operative limb alignment if long leg x-rays available
Time Frame: 2 years
Comparison of limb alignment between pre-operative and post-operative x-rays.
2 years
Length of hospital stay in hours
Time Frame: 1 year
How long the patient is in the hospital from the time of admission to the time of discharge.
1 year
Blood loss during surgery
Time Frame: 1 year
Estimated blood loss during surgery (mL)
1 year
Transfusion rate
Time Frame: 1 year
Rate of patients who require blood transfusions during surgery
1 year

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
Revision rates post-implantation
Time Frame: Collected from the date of implantation to the end of the study. Up to 10 years.
Rate of patients that require a revision of the total knee replacement for any reason.
Collected from the date of implantation to the end of the study. Up to 10 years.
Length of procedure: Skin to Skin
Time Frame: 1 year
The duration of the knee arthroplasty starting from the time the surgeon makes the first incision and ending when the surgeon sutures the initial incision.
1 year

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.
Restor3D

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.
  • Study Director: Marc Quartulli, Restor3D

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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 (Actual)

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.
May 1, 2017

Primary Completion (Actual)

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.
November 1, 2022

Study Completion (Actual)

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.
November 1, 2022

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).
May 8, 2017

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.
May 11, 2017

First Posted (Actual)

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.
May 12, 2017

Study Record Updates

Last Update Posted (Actual)

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.
October 25, 2023

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.
October 23, 2023

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.
October 1, 2023

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

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.
  • 14-003

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

Yes

product manufactured in and exported from the U.S.

Yes

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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