In an effort to satisfy regulatory requirements for post-market surveillance of product safety and efficacy, a representative sample of patients will be recruited for prospective monitoring.
In an effort to satisfy regulatory requirements for post-market surveillance of product safety and efficacy, a representative sample of patients will be recruited for prospective monitoring. To maintain equal site distribution per device, patient recruitment will include up to a total of twenty (20) registry sites and thirty (30) primary TKA candidates per site / surgeon for a total of 600 registry patients. A total of no more than 200 patients across all sites will be recruited per level of constraint (e.g.: 200 CR, 200:PS, 200:UC) for this registry with a 10-month accrual target from study initiation per site (\~3 patients consented / month).
Study Type
OBSERVATIONAL
Enrollment
300
Post-Market Surveillance of the Freedom Total Knee System for Primary TKA
Ascentist Healthcare
Leawood, Kansas, United States
South Texas Bone & Joint Institute
San Antonio, Texas, United States
Device Survivorship
Revision / re-operation post-operatively due to device / device composite failure. An anticipated benefit of the device is that it is more conforming at higher degrees of flexion, which could potentially result in reduced polyethylene wear and improved survivorship over the longer-term. To assess this aspect of the device in addition to safety over the short-, intermediate- and long-term, survivorship analyses will be conducted at the targeted follow-up landmark timepoints. There will be 3 survivorship endpoints: * Revision of any component (including insert) for any reason * Revision of any component (including insert) for any reason except infection
Time frame: 2 years
Original Knee Society Scale (KSS)
The Knee Society Score rating system was first introduced during the late 1980's and has become the standard clinical evaluation system for reporting results for patients undergoing Total Knee Arthroplasty. Most major journals strongly encourage that total knee manuscripts include Knee Society Score rating scores as part of the result section. The Knee Society Score consists of points given for pain, range of motion, and stability. The Function Score consists of points given for the ability to walk on level surfaces, and the ability to ascend and descend stairs, with deductions for the use of external supporting devices.
Time frame: 3-6 Weeks, 3 Months, 6 Months, 12 Months, 24 Months
Knee Injury and Osteoarthritis Outcome Score - Joint Replacement (KOOS-JR)
The KOOS-JR is self-administered and assesses three domains: stiffness (1 question), pain (4 questions), function / daily living (2 questions). The KOOS-JR meets basic criteria of outcome measures and can be used to evaluate the course of knee injury and treatment outcome. Each item (questions) is coded from 0 to 4. The raw responses are summed (0-28) which is then converted to an interval score based on the KOOS-JR conversion table. The score is a percentage score from 0 to 100, 0 representing total knee disability and 100 representing perfect knee health.
Time frame: 3-6 Weeks, 3 Months, 6 Months, 12 Months, 24 Months
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Patient Reported Outcomes Measurement Information System (PROMIS Global-10)
The Patient Reported Outcomes Measurement Information System (PROMIS Global-10) is a valid and reliable patient assessment and consists of ten (10) items that measure physical health, physical functioning, general mental health, emotional distress, satisfaction with social activities and relationships, ability to carry out usual social activities and roles, pain, fatigue and overall quality of life. The response options are presented as 5-point (as well as a single 11-point) rating scales. The results of the questions are used to calculate two summary scores: a Global Physical Health Score and a Global Mental Health score. These scores are then standardized to the general population, using the "T-Score". The average "T-Score" for the United States population is 50 points, with a standard deviation of 10 points. Higher scores indicate a healthier patient. The PROMIS 10 scores are predictive of healthcare utilization, mortality in general and disease-specific clinical populations.
Time frame: 3-6 Weeks, 3 Months, 6 Months, 12 Months, 24 Months
Visual Analog Scale (VAS)
This scale has been designed to give subjective pain information as to the degree of knee pain you the patient is currently experiencing. VAS scoring is included in the PROMIS GLOBAL-10 assessment and is not necessary to collect a separate assessment. Applying the VAS, the patient will select a number from 1 (no pain) to 10 (maximum pain) that most closely describes their current pain.
Time frame: 3-6 Weeks, 3 Months, 6 Months, 12 Months, 24 Months
Forgotten Joint Score (FJS-12)
The 12 question Forgotten Joint Score (FJS-12) was introduced with the aim of assessing the patients 'joint awareness'. The authors of the score suggest the "higher the score" is more representative of higher-level function after surgery, as to be able to forget about the joint requires the absence of pain and the ability to perform all desired functional tasks without limitation.
Time frame: 3-6 Weeks, 3 Months, 6 Months, 12 Months, 24 Months