Revision of Unicompartmental Knee Arthroplasty to Total Knee Arthroplasty Using the CORITM Imageless System: A Step-By-Step Surgical Technique.
5 affiliations
- 1Department of Orthopaedic Surgery, Hôpital Pierre Paul Riquet, CHU de Toulouse, 1 Place du Docteur Baylac, 31000 Toulouse, France - University for Continuing Education Krems, Dr.-Karl-Dorrek-Strasse 30, 3500 Krems, Austria.
- 2Clinique Aguilera Ramsay Santé Biarritz, 6 rue de l'Estagnas, 64200 Biarritz, France.
- 3Department of Orthopaedic Surgery, Hôpital Pierre Paul Riquet, CHU de Toulouse, 1 Place du Docteur Baylac, 31000 Toulouse, France.
- 4Department of Orthopaedic Surgery, Institut Mutualiste Montsouris (IMM), 42 Bd Jourdan, 75014 Paris, France.
- 5Università degli Studi "Link Campus University", Dipartimento di Scienze della Vita, della Salute e delle Professioni Sanitarie, Via del Casale di S. Pio V 44, 00165 Rome, Italy.
Abstract
Conversion of unicompartmental knee arthroplasty (UKA) to total knee arthroplasty (TKA) is technically demanding due to altered anatomy, asymmetric bone loss, and soft-tissue imbalance, often necessitating stems or augments. Robotic-assisted TKA may enhance the accuracy of bone resection and ligament balancing, potentially facilitating bone preservation in this complex setting. This article describes a step-by-step surgical technique for imageless robotic-assisted conversion of a failed medial UKA to TKA using the CORI™ system in a case of early aseptic loosening. The workflow is based on intraoperative surface mapping and dynamic kinematic assessment. The knee is initially registered as a native joint to capture global alignment and soft-tissue behavior, followed by additional reference point acquisition after implant removal to accurately quantify bone loss. This strategy enables patient-specific planning of femoral and tibial resections, real-time adjustment of component positioning, and controlled gap balancing throughout the range of motion. The principal innovation of this technique is the dual-stage imageless robotic workflow, combining pre-explant native kinematic registration with post-explant defect mapping and iterative re-planning. In the presented case, conversion was successfully achieved without the use of stems or augments. Imageless robotic-assisted UKA-to-TKA conversion using this technique appears feasible and reproducible. By combining native kinematic mapping with quantitative defect assessment, this workflow may facilitate accurate implant positioning, controlled gap balancing, and bone-preserving reconstruction in selected cases.
Related
- Personalized Revision Arthroplasty After Failed Medial Unicompartmental Knee Arthroplasty: A Contemporary Narrative Review
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- The cup-on-cup technique for managing massive acetabular defects in revision total hip arthroplasty: a systematic review.
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BibTeX
@article{croitor2026revision,
title = {{Revision of Unicompartmental Knee Arthroplasty to Total Knee Arthroplasty Using the CORITM Imageless System: A Step-By-Step Surgical Technique.}},
author = {Dan Croitor and Régis Pailhé and Alexandre Le Guen and Ali Alayane and Étienne Cavaignac and Alessandro Carrozzo},
journal = {SICOT-J},
year = {2026},
month = oct,
doi = {10.1051/sicotj/2026045},
url = {https://europepmc.org/article/MED/42852804},
note = {CC BY},
}
RIS
TY - JOUR
TI - Revision of Unicompartmental Knee Arthroplasty to Total Knee Arthroplasty Using the CORITM Imageless System: A Step-By-Step Surgical Technique.
AU - Dan Croitor
AU - Régis Pailhé
AU - Alexandre Le Guen
AU - Ali Alayane
AU - Étienne Cavaignac
AU - Alessandro Carrozzo
PY - 2026
DA - 2026/10/09
JO - SICOT-J
DO - 10.1051/sicotj/2026045
UR - https://europepmc.org/article/MED/42852804
AB - Conversion of unicompartmental knee arthroplasty (UKA) to total knee arthroplasty (TKA) is technically demanding due to altered anatomy, asymmetric bone loss, and soft-tissue imbalance, often necessitating stems or augments. Robotic-assisted TKA may enhance the accuracy of bone resection and ligament balancing, potentially facilitating bone preservation in this complex setting. This article describes a step-by-step surgical technique for imageless robotic-assisted conversion of a failed medial UKA to TKA using the CORI™ system in a case of early aseptic loosening. The workflow is based on intraoperative surface mapping and dynamic kinematic assessment. The knee is initially registered as a native joint to capture global alignment and soft-tissue behavior, followed by additional reference point acquisition after implant removal to accurately quantify bone loss. This strategy enables patient-specific planning of femoral and tibial resections, real-time adjustment of component positioning, and controlled gap balancing throughout the range of motion. The principal innovation of this technique is the dual-stage imageless robotic workflow, combining pre-explant native kinematic registration with post-explant defect mapping and iterative re-planning. In the presented case, conversion was successfully achieved without the use of stems or augments. Imageless robotic-assisted UKA-to-TKA conversion using this technique appears feasible and reproducible. By combining native kinematic mapping with quantitative defect assessment, this workflow may facilitate accurate implant positioning, controlled gap balancing, and bone-preserving reconstruction in selected cases.
SN - 2426-8887
ER -