LFIT™ Anatomic CoCr Femoral Heads With X3® Polyethylene Insert Study (LFIT)
|The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.|
|ClinicalTrials.gov Identifier: NCT00510458|
Recruitment Status : Completed
First Posted : August 2, 2007
Results First Posted : March 12, 2018
Last Update Posted : March 12, 2018
|Condition or disease||Intervention/treatment||Phase|
|Arthroplasty, Replacement, Hip||Device: LFIT™ Femoral Heads With X3® Insert||Not Applicable|
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||89 participants|
|Intervention Model:||Single Group Assignment|
|Masking:||None (Open Label)|
|Official Title:||LFIT™ Anatomic CoCr Femoral Heads With X3® Polyethylene Insert Study - An Open Label, Prospective, Post-market, Multi-center Clinical Evaluation of the LFIT™ Anatomic CoCr Femoral Heads With X3® Inserts|
|Study Start Date :||April 2007|
|Actual Primary Completion Date :||December 2016|
|Actual Study Completion Date :||December 2016|
LFIT™Femoral Heads With X3® Insert
LFIT™ Femoral Heads With X3® Insert
Device: LFIT™ Femoral Heads With X3® Insert
LFIT™ Anatomic CoCr Femoral Heads With X3® Polyethylene Insert in total hip replacement
- Linear Wear Rate [ Time Frame: 5 Years Post-Surgery ]
Linear wear rate is defined as the annual rate of removal of the polyethylene from the X3 polyethylene insert mated with LFIT™ Anatomic CoCr Femoral Heads determined by comparing digitized images of serial radiographs obtained over the follow-up period.
- Change in Harris Hip Score (HHS) From Pre-operative to Post-operative Visits [ Time Frame: preoperative, 1, 3, and 5 years ]
The change in HHS is reported by comparing the mean preoperative, 1, 3, and 5 year scores. The HHS assesses pain, function, joint deformity and range of motion. Scores can range from 0 to 100 with 0 being the worst and 100 being the best score. A score of 80-100 is considered good-excellent and a score of less than or equal to 79 is considered fair-poor.
90-100 = excellent 80-89 = good 70-79 = fair 0-69 = poor
- Change in Harris Hip Score (HHS) Pain Score From Pre-operative to Post-operative Visits [ Time Frame: preop, 1, 3, and 5 Years ]
This subscore of the overall HHS provides the patient with 6 possible answers to choose from ranging from, no pain/ignores it, to totally disabled/crippled/pain in bed/bedridden. A maximum of 44 points is possible for this subscore indicating no pain/ignores it.
- None or ignores it = 44 points
- Slight, occasional, no compromise in activities = 40 points
- Mild pain, no effect on average activities, rarely moderate pain with unusual activity, may take aspirin = 30 points
- Moderate pain, tolerable but makes concessions to pain. Some limitation of ordinary activity or work. May require occasional pain medicine stronger than aspirin = 20 points
- Marked pain, serious limitation of activities = 10 points
- Totally disabled, crippled, pain in bed, bedridden = 0 points
- Change in Harris Hip Score (HHS) Range of Motion (ROM) Score From Pre-operative to Post-operative Visits. [ Time Frame: preoperative, 1, 3, and 5 Years ]
This subscore of the overall HHS includes the total points awarded for five different ranges of motion (flexion, abduction, external rotation, internal rotation, adduction). Subscore range is minimum of 0 to maximum of 5 points; the higher the value, the better the outcome.
0-45 degrees x 1.0 index value = max 45 points
45-90 degrees x 0.6 index = max 27 points
90-110 degrees x 0.3 index = max 6 points
110-130 degrees = max 0 points
0-15 degrees x 0.8 index = max 12 points
15-20 degrees x 0.3 index = max 1.5 points
20-45 degrees x 0 index = max 0 points
External Rotation in extension:
0-15 degrees x 0.4 index = max 6 points
Over 15 degrees = max 0 points
Internal Rotation in extension:
Any = max 0 points
0-15 degrees x 0.2 index = max 3 points
Over 15 degrees - max 0 points
To determine the over-all rating for range of motion, multiply the sum of the index values x 0.05.
- Change in SF-12 Health Survey Score (Physical and Mental) From Pre-operative to Post-operative Intervals. [ Time Frame: preop, 1, 3, and 5 Years ]The change in SF-12 is reported by comparing the mean preoperative, 1, 3, and 5 year scores. The SF-12 Health Survey is a 12 item patient completed questionnaire to measure general health and well-being. It includes a physical component score and mental status component score; each ranging from 0-100. Low values represent a poor health state and high values represent a good health state.
- Change in Lower Extremity Activity Scale (LEAS) From Pre-operative to Post-operative [ Time Frame: preoperative, 1, 3, and 5 Years ]The change in LEAS is reported by comparing the mean pre-operative, 1,3,and 5 year scores. The LEAS completed by the participant to assess activity level. Activity levels were ordered in terms of intensity from 1 to 18, with 18 indicating the highest activity level.
- Number of Hips That Dislocated [ Time Frame: 3 and 5 years ]The number of hips that experienced a hip dislocation.
- Number of Hips Evaluated as Radiographically Unstable [ Time Frame: 1, 3, 5 years ]
Radiographic instability is defined as having any of the following findings on x-ray:
- Radiographic indication of progressive radiolucent lines ≥ 2 mm in thickness around the entire acetabular component
- Radiographic indication of migration of ≥ 3 mm or ≥ 5° of the acetabular component
- Radiographic indication of progressive radiolucent lines ≥ 2 mm thickness around the entire femoral component
- Radiographic indication of progressive subsidence of the femoral component of ≥ 5 mm.
- Percentage of Cases That Did Not Have Any Component Revised [ Time Frame: 5 years ]
A revision is defined as surgical removal and replacement of the femoral bearing head or femoral stem components, or the acetabular shell or acetabular polyethylene liner.
The 97.42% estimate is obtained by Kaplan-Meier method.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00510458
|United States, Florida|
|Cedars Medical Center University of Miami|
|Miami, Florida, United States, 33136|
|United States, Massachusetts|
|Tufts Medical Center|
|Boston, Massachusetts, United States, 02111|
|United States, New Jersey|
|Ocean City, New Jersey, United States, 07712|
|United States, Oregon|
|The Center: Orthopedic & Neurosurgical Care & Research|
|Bend, Oregon, United States, 97701|
|United States, Pennsylvania|
|Greater Pittsburgh Orthopaedic Associates|
|Moon, Pennsylvania, United States, 15108|
|Study Chair:||James D'Antonio, MD||Greater Pittsburgh Orthopaedic Associates|
|Principal Investigator:||Stephen Thomas, M.D.||Greater Pittsburgh Orthopaedic Associates|
|Principal Investigator:||Eric Smith, M.D.||Tufts University Medical Center|
|Principal Investigator:||Arthur Mark, M.D.||Seaview Orthopaedic|