A novel knee implant for total knee arthroplasty meets expectations at 10 years. First long‐term follow‐up report of clinical outcomes and survivorship
Bibliographic record
Abstract
PURPOSE: Achieving a "forgotten knee" after total knee arthroplasty (TKA) remains a primary goal in modern knee replacement surgery. Anatomic implant designs aim to replicate native knee anatomy and kinematics, potentially improving patient satisfaction and functional outcomes. This study evaluates the long-term clinical outcome and survivorship of the Persona Knee System at a minimum follow-up of 10 years. METHODS: 116 TKAs performed using the Persona Posterior Stabilised (PS) Knee System (Zimmer Biomet, Warsaw, Indiana, USA) between 2013 and 2014 at a high-volume orthopaedic centre were prospectively followed and retrospectively analysed. Clinical outcomes were assessed using patient-reported outcome measures (PROMs), including the Forgotten Joint Score-12 (FJS-12), Oxford Knee Score (OKS), and Western Ontario and McMaster Universities Arthritis Index (WOMAC). Implant survivorship was determined using Kaplan-Meier analysis, and complication rates were recorded. RESULTS: At a mean follow-up of 11.1 years, 116 knees were available for analysis. Patients were assessed clinically and radiographically at 1, 3 and 6 months postoperatively, and then annually, with a mean follow-up of 11.1 years. The mean FJS-12 was 69.52 (SD 12.21, range 15-88), indicating a high level of joint awareness reduction. The OKS and WOMAC scores significantly improved postoperatively, with mean final values of 38.63 (SD 7.99, range 7-48) and 25.29 (SD 16.97, range 4-91), respectively. Radiological analysis demonstrated accurate and stable implant positioning, with no progressive radiolucent lines in non-revised cases. Kaplan-Meier survival analysis showed a 95.7% (SD 1.9%) implant survival rate. The revision rate was 4.3%, with aseptic loosening and persistent painful prosthesis as the primary causes. CONCLUSION: The anatomic design of the Persona Knee System provides excellent long-term clinical outcomes, high patient satisfaction, and sustained implant durability. Future research should further investigate patient-specific factors and surgical refinements to optimise long-term outcomes in TKA. LEVEL OF EVIDENCE: Level III.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".