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A Study to Compare the NexGen LPS and LPS-Flex Knee Implants

This study has been completed.
Sponsor:
Information provided by (Responsible Party):
Zimmer, Inc.
ClinicalTrials.gov Identifier:
NCT00763386
First received: September 26, 2008
Last updated: May 25, 2012
Last verified: May 2012

September 26, 2008
May 25, 2012
June 2001
December 2009   (final data collection date for primary outcome measure)
Postoperative Range of Motion (ROM) [ Time Frame: 6 Weeks to 2 Years Post-op, based on on the intervals listed ] [ Designated as safety issue: No ]
Postoperative ROM was calculated by taking the measurement of patient flexion minus the measurement of patients' extension.
Postoperative range of motion [ Time Frame: 24 Months ] [ Designated as safety issue: No ]
Complete list of historical versions of study NCT00763386 on ClinicalTrials.gov Archive Site
Return to Function (RtF) Via Knee Society Score (Modified) [ Time Frame: 6 Weeks to 2 Years Post-op, based on on the intervals listed ] [ Designated as safety issue: No ]

Scores were calculated from responses on a modified Knee Society Score by the enrolled subjects for the stated visit intervals.

Grading for the Knee Society Score is based on a scale from 0-100 and results are established follows: 80-100 =Excellent; 70-79 = Good; 60-69 = Fair; and Below 60 = Poor.

Return to function [ Time Frame: 24 Months ] [ Designated as safety issue: No ]
Not Provided
Not Provided
 
A Study to Compare the NexGen LPS and LPS-Flex Knee Implants
Prospective Randomized Multicenter Study of NexGen LPS-Flex Knee

The purpose of this study is to test for significant differences in functional outcomes obtained by using a NexGen LPS versus a NexGen LPS-Flex knee implant. Specifically, it is predicted that an increase in postoperative range of motion will be experienced by patients treated with the NexGen LPS-Flex knee implant.

This study will compare the clinical results of the NexGen LPS femoral component with the higher flexion potential of the NexGen LPS-Flex femoral component in all patients with degenerative joint disease that require total knee arthroplasty. The primary variable of interest is postoperative range of motion achieved with the two devices, which are implanted with slightly different surgical techniques in patients who may also be subjected to different rehabilitation programs depending on the device they are assigned.

Interventional
Not Provided
Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Single Blind (Subject)
Primary Purpose: Treatment
  • Total Knee Arthroplasty
  • Osteoarthritis
  • Device: NexGen LPS-Flex Fixed Bearing Knee
    NexGen LPS-Flex Fixed Bearing femoral component
    Other Name: LPS-Flex Knee
  • Device: NexGen Legacy Posterior Stabilized Knee
    NexGen Legacy Posterior Stabilized femoral component
    Other Name: LPS Knee
  • Active Comparator: 1
    Study arm will consist of patients that are treated with the NexGen LPS-Flex Fixed Bearing Knee.
    Intervention: Device: NexGen LPS-Flex Fixed Bearing Knee
  • Active Comparator: 2
    Study arm will consist of patients that are treated with the NexGen Legacy Posterior Stabilized Knee.
    Intervention: Device: NexGen Legacy Posterior Stabilized Knee
Not Provided

*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
 
Completed
331
March 2010
December 2009   (final data collection date for primary outcome measure)

Inclusion Criteria:

  • Age, 21-80 years
  • Sex, Males and females will be included
  • BMI less than or equal to 39 and calf-thigh less than or equal to 90 degrees
  • Stable health, the patient would be able to undergo surgery and participate in the follow-up program based on physical examination and medical history.
  • Patient is willing and able to cooperate in follow-up therapy.
  • Patient exhibits preoperative radiographic evidence of joint degeneration consistent with TKA that cannot be treated in non-operative fashion.
  • Patient has stable and functional collateral ligaments.
  • Patient has potential to perform higher than average range of motion activities.
  • Operative side range of motion flexion greater than or equal to 90 degrees.
  • Severe knee pain and disability due to degenerative joint disease.
  • Patient or patient's legal representative has signed the Informed Consent form.

Exclusion Criteria:

  • Previous history of infection in the affected joint.
  • Previously failed knee endoprosthesis of any kind.
  • Charcot joint disease or other severe neurosensory deficits.
  • Previous patellectomy.
  • Patient is skeletally immature.
  • Grossly insufficient femoral or tibial bone stock.
  • Patient is pregnant.
  • Varus or valgus deformity greater than 20 degrees.
  • Fixed flexion deformity greater than 15 degrees.
  • Previous high tibial osteotomy.
  • Previous femoral osteotomy.
  • Patient is a poor compliance risk - currently treated for ethanol or drug abuse, physical or mental handicap, etc.
  • Loss of musculature or absence of musculoligamentous supporting structures required for adequate soft tissue balance.
Both
21 Years to 80 Years
No
Contact information is only displayed when the study is recruiting subjects
United States,   Canada
 
NCT00763386
00-500
No
Zimmer, Inc.
Zimmer, Inc.
Not Provided
Not Provided
Zimmer, Inc.
May 2012

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP