The cementless ATTUNETM Rotating Platform Knee system was compared in a single-blind, randomized RSA trial to its predecessor, the LCS rotating platform Knee System. In this previous study, 61 knees were subjected to RSA examinations at 1-day and 3, 6, 12 and 24 months postoperative. This study found a promising equal migration of both tibial components and a lesser migration of the femoral component of the ATTUNETM knee system after two years, although with a similar migration rate between year 1 and 2. this raises the question of whether the migration of the prostheses relative to each other will increase or remain the same in the long term. To examine this, a mid-and long-term RSA follow-up to measure migration is necessary. In addition, another new RSA measurement parameter has become known in recent years that may provide an indication of the bonding of the prosthesis to the bone at the time of measurement. This new parameter, called the Induced Displacement (ID) of a prosthesis, measures the position and orientation relative to the bone while the prosthesis is under different loading conditions (e.g., patient in supine or standing position). This means that a large measured difference between these different loading condition measurements would indicate that osseointegration of the prosthesis never occurred or is no longer present. To improve the understanding of the tendency of both prostheses to aseptic loosening after a mid- to long-term follow up, migration over time and inducible displacement analyses are necessary. The primary objective of this study is to accurately compare mid- and long-term migration of two uncemented TKR prostheses. The secondary objectives of this study are to evaluate if inducible displacement can be used as a parameter to detect loose implants, and to compare inducible displacement, clinical and radiological outcome and patient-reported outcomes (PROMS) after a follow-up of 5 and 10 years of two uncemented TKR prostheses.
Study Type
OBSERVATIONAL
Enrollment
49
RSA radiographs will be made 5 and 10 years after the total knee arthroplasty.
Spaarne Gasthuis
Hoofddorp, North Holland, Netherlands
Change from baseline migration of the prostheses
Migration is measured and expressed in translations, rotations, and MTPM; MTPM is the point of the prosthesis that has moved most.
Time frame: 5 years post TKA
Ten year change from baseline migration of the prostheses
Migration is measured and expressed in translations, rotations and MTPM; MTPM is the point of the prosthesis that has moved most.
Time frame: 10 years post TKA
Inducible displacement
The inducible displacement is defined as the difference in translation (MTPM) between a measurement without external force (e.g., supine position) and a measurement with external force (e.g., weight bearing) minus the measurement error.
Time frame: 5 years post TKA
Inducible displacement
The inducible displacement is defined as the difference in translation (MTPM) between a measurement without external force (e.g., supine position) and a measurement with external force (e.g., weight bearing) minus the measurement error.
Time frame: 10 years post TKA
EuroQol 5D-5L (EQ-5D-5L)
A patient reported outcome score for assessing mental well-being by using a score from 0 to 1, with 0 = worse and 1 = best.
Time frame: 5 year post TKA
EuroQol 5D-5L (EQ-5D-5L)
A patient reported outcome score for assessing mental well-being by using a score from 0 to 1, with 0 = worse and 1 = best.
Time frame: 10 year post TKA
Knee injury and Osteoarthritis Outcome Scale Physical Function Short-form (KOOS-PS)
A 7-item patient reported outcome score that measures daily physical functioning by using a score of 0 to 100, with 0 = no problems and 100 = extreme problems.
Time frame: 5 year post TKA
Knee injury and Osteoarthritis Outcome Scale Physical Function Short-form (KOOS-PS)
A 7-item patient reported outcome score that measures daily physical functioning by using a score of 0 to 100, with 0 = no problems and 100 = extreme problems.
Time frame: 10 year post TKA
Oxford-12 Knee Score (OKS)
A 12-item patient-reported outcome score to assess function and pain after total knee arthroplasty. The score uses a score of 0 to 48, with 0 = worse and 48 = best.
Time frame: 5 year post TKA
Oxford-12 Knee Score (OKS)
A 12-item patient-reported outcome score to assess function and pain after total knee arthroplasty. The score uses a score of 0 to 48, with 0 = worse and 48 = best.
Time frame: 10 year post TKA
Kujala Anterior Knee Pain Scale (AKPS)
A 13-item patient reported outcome score for assessing daily anterior knee pain, by using a score from 0 to 100, with 0 = having anterior knee pain with disabilities and 100 = no signs of anterior knee pain.
Time frame: 5 year post TKA
Kujala Anterior Knee Pain Scale (AKPS)
A 13-item patient reported outcome score for assessing daily anterior knee pain, by using a score from 0 to 100, with 0 = having anterior knee pain with disabilities and 100 = no signs of anterior knee pain.
Time frame: 10 year post TKA
Numeric Rating Scale (NRS)
A patient reported outcome score for assessing pain by using a likert scale from 0 to 10, with 0 = no pain and 10 = severe pain)
Time frame: 5 year post TKA
Numeric Rating Scale (NRS)
A patient reported outcome score for assessing pain by using a likert scale from 0 to 10, with 0 = no pain and 10 = severe pain)
Time frame: 10 year post TKA
Anchor questions
A patient reported outcome score for assessing change in functioning and pain since surgery. The outcome is evaluated by use of a likert scale from 1 to 7, with 1 = much deteriorated and 7 = much improved).
Time frame: 5 year post TKA
Anchor questions
A patient reported outcome score for assessing change in functioning and pain since surgery. The outcome is evaluated by use of a likert scale from 1 to 7, with 1 = much deteriorated and 7 = much improved).
Time frame: 10 year post TKA
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