A Single-Center, Epidemiological Study of the Survivorship of the DePuy Sigma HP Unicompartmental Knee Prosthesis

Two and Five-Year Survivorship of Unicompartmental Knee Arthroplasty Using DePuy Sigma HP Replacement

This study will be conducted to assess the survivorship of a particular prosthesis used in unicompartmental knee arthroplasties. Patients undergoing this procedure have been diagnosed with isolated medial or lateral compartmental arthritis and have failed conservative treatment. The patients received a unicompartmental knee replacement using the Sigma® HP Partial Knee System.

Study Overview

• Status: Completed
• Conditions: Osteoarthritis; Unicompartmental Knee Arthroscopy
• Intervention / Treatment: Device: DePuy Sigma HP Partial Knee

Detailed Description

This study is an epidemiological Level IV-Case Series clinical study that will study the survivorship of the Sigma® HP Partial Knee System in a consecutive series of patients. All patients who received the Sigma® HP Partial Knee System between August 21, 2008 and October 31, 2009 will be available to include in the study. Data will be collected preoperatively, intra-operatively, and post-operatively at intervals of 6 weeks, 6 months, 1 year, 2 years, and 5 years. Data will be analyzed for survivorship status at the 2- and 5-year follow-up visits. Other data, including functional outcomes, radiographic outcomes, and wear will be analyzed at the 5-year follow-up visit. Subjects will participate in the study for five years after their surgery.

• Study Type: Observational
• Enrollment (Actual): 300

Contacts and Locations

Study Locations

• United States
  • Mississippi
    • Jackson, Mississippi, United States, 39202
      • Mississippi Sports Medicine and Orthopaedic Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

• Sampling Method: Non-Probability Sample

Study Population

Since the first Sigma® HP Partial Knee System was introduced at MSMOC, over 1,000 have been implanted in patients by the investigators of this study. The population used for this study was the first patients of our clinic to receive this particular prosthesis. The first replacement was implanted on August 21, 2008. By October 31, 2009, 300 patients had received the Sigma® HP replacement. These 300 patients will be the subject population whose data will be analyzed for the study upon their consent.

Description

Inclusion Criteria:

• Adult patient over the age of 18
• Diagnosis of isolated medial or lateral compartmental osteoarthritis of the knee joint
• Must have failed conservative treatment and received a unicompartmental knee arthroplasty between August 21, 2008 and October 31, 2009.
• Must have received the Sigma® HP Partial Knee System.
• Must have received the surgery from Dr. Almand, Dr. Johnson, or Dr. Pickering at Mississippi Sports Medicine and Orthopaedic Center.
• Must be willing to provide written consent to participate in the study.
• Subjects who do not have the legal capacity to consent may be enrolled in the study by a Legally Authorized Representative (LAR). The LAR must provide verification that they have the legal authority to represent the subject.

Exclusion Criteria:

• Did not receive a unicompartmental knee arthroplasty between August 21, 2008 and October 31, 2009.
• Did not receive a unicompartmental knee arthroplasty using the Sigma® HP Partial Knee.
• Did not receive their unicompartmental knee replacement from Dr. Almand, Dr. Johnson, or Dr. Pickering at Mississippi Sports Medicine and Orthopaedic Center.
• Subjects lost to follow-up for any reason including, but not limited to: refusal to consent, death, or geographic isolation will also be excluded from the study.

Study Plan

How is the study designed?

Design Details

• Observational Models: Cohort
• Time Perspectives: Other

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Five-Year Survivorship	The primary endpoint of the study is to determine the five-year survivorship of the Sigma® HP Partial Knee System with failure defined as revision for any reason.	Five Years Post-Op

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Five-Year Survivorship Alternately Defining Failure and Two-Year Survivorship	One secondary endpoint of the study is to determine the five-year survivorship of the prosthesis with alternately defining failure as: failure of implant, failure secondary to infection, failure secondary to progression of arthritis, failure secondary to periprosthetic fracture. We also want to determine the two-year survivorship with failure defined as revision for any reason.	Two Years and Five Years Post-Op
Functional Outcomes	Another secondary endpoint of the study is to analyze the functional outcomes for five-year data based on the Knee Society score and the KOOS (Knee Injury and Osteoarthritis Outcome Score) score, reported as changes from the pre-operative score. By using both rating systems, an appropriate evaluation of the functional outcome of the surgery should be obtained.	Five Years Post-Op
Radiographic Outcomes	Another secondary endpoint of the study is to determine the radiographic outcomes based upon the radiographic assessment using the Knee Society scoring system, reported as changes from the pre-operative assessment. Additionally, we want to radiographically assess lucencies at the bone cement and implant cement interface to measure wear and loosening of the prosthesis.	Pre-Operatively, Two and Five-Year Post-Op
Adverse Advents	We also want to examine the type and frequency of adverse events as a secondary endpoint of the study. Safety will be evaluated with summary of adverse events.	Post-Operatively

Collaborators and Investigators

• Sponsor: Mississippi Sports Medicine and Orthopaedic Center
• Collaborators: DePuy Orthopaedics
• Investigators: Principal Investigator: Jeff D Almand, MD, Mississippi Sports Medicine and Orthopaedic Center

Study record dates

Study Major Dates

• Study Start: August 1, 2012
• Primary Completion (Actual): December 31, 2015
• Study Completion (Actual): December 1, 2016

Study Registration Dates

• First Submitted: August 1, 2012
• First Submitted That Met QC Criteria: August 1, 2012
• First Posted (Estimate): August 3, 2012

Study Record Updates

• Last Update Posted (Actual): March 22, 2018
• Last Update Submitted That Met QC Criteria: March 20, 2018
• Last Verified: March 1, 2018

More Information

Terms related to this study

• Keywords: Osteoarthritis; Replacement; Knee; Unicompartmental; DePuy; Sigma HP
• Additional Relevant MeSH Terms: Joint Diseases; Musculoskeletal Diseases; Rheumatic Diseases; Arthritis; Osteoarthritis
• Other Study ID Numbers: 11018