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Clinical and radiological analysis of a personalized total knee arthroplasty system design

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Abstract

Purpose

The objectives of this study were to determine the radiological outcome of a new personalized total knee arthroplasty (TKA) design and also to analyze the radiological reproducibility of the surgical technique.

Patients and methods

A total of 100 consecutive TKAs performed in 99 patients using Persona knee system were recruited. Weight-bearing standing anteroposterior and lateral radiographs were done in all the patients, both pre-operatively as well as post-operatively, and various radiological parameters were analyzed and compared.

Results

The full correction of the limb mechanical axis was achieved in 97% of patients, and the radiological parameters of coronal and sagittal alignment of femoral and tibial components showed good results. There were no substantial differences between the mean pre-operative and post-operative patellar height indices, and data were in the normal range. Posterior condylar offset (PCO) and posterior condylar offset ratio (PCOR) had increased as expected after TKA. The coverage of tibia was optimal with data in the normal range.

Conclusions

Radiological assessment of the new personalized knee system design showed excellent results with various parameters restored to the normal values. Therefore, the prosthesis can be considered anatomic, and the surgical technique is reproducible allowing the prosthesis to be implanted easily and with high precision.

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Authors and Affiliations

  1. Department of Clinical-Surgical Sciences, Diagnostics and Pediatrics, Operative Unit of Orthopaedics and Traumatology, Fondazione IRCCS Policlinico San Matteo, University of Pavia, Via Golgi, 19, 27100, Pavia, Italy

    Francesco Benazzo, Matteo Ghiara, Stefano Marco Paolo Rossi, Emma Pruneri & Simone Perelli

  2. SICOT Fellow at Department of Clinical-Surgical Sciences, Diagnostics and Pediatrics, Operative Unit of Orthopaedics and Traumatology, Fondazione IRCCS Policlinico San Matteo, University of Pavia, Pavia, Italy

    Vivek Tiwari

Authors
  1. Francesco Benazzo
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  2. Matteo Ghiara
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  3. Stefano Marco Paolo Rossi
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  4. Emma Pruneri
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  5. Vivek Tiwari
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  6. Simone Perelli
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Corresponding author

Correspondence to Matteo Ghiara.

Ethics declarations

Ethical Committee approval was obtained for this study.

Conflict of interest

The first author (FB) is part of the design team of the implant. The other authors (MG, SMPR, EP, VT, and SP) declare that they have no conflict of interest. The study is a spontaneous observational investigation carried out by the authors.

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Benazzo, F., Ghiara, M., Rossi, S.M.P. et al. Clinical and radiological analysis of a personalized total knee arthroplasty system design. International Orthopaedics (SICOT) 43, 1113–1121 (2019). https://doi.org/10.1007/s00264-018-4095-4

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  • DOI: https://doi.org/10.1007/s00264-018-4095-4

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