Computed tomography evaluation of total knee arthroplasty implants position after two different surgical methods of implantation
- 117 Downloads
The objectives of this study were to determine the reliability of a novel method of measuring the rotational alignment of an anatomical tibial tray, the difference in the rotational alignment of the femoral and tibial component according to pure measured resection or blended technique with tensor, and, finally, the difference in terms of clinical results according to the two different methods.
Patients and methods
We performed a total of 60 consecutive TKAs: 30 according to pure measured resection and 30 according to blended technique with tensor (FuZion®). Clinical scores and CT scan were done at six months to measure patient’s outcome and prosthetic components rotation.
The method of measurement of tibial tray had high agreement between different radiological observers. Mean external rotation alignment of the femur was 2.7° in standard group and 0.5° in the FuZion® group. For all clinical indices, we observed a large and significant improvement at follow-up, better in blended technique group, but without a clear superiority, and no statistically significant difference was evident between the two groups. At follow-up, HSS was to 89.7 in the FuZion® group and 89.0 in the standard group, KSS (clinical) was 92.6 in and 91.3 respectively, and KSS (Functional) was 91.0 in the FuZion® group and 87.6 in the standard group.
Our CT measurement method is reliable and reproducible. All patients operated with this personalized knee system design obtained excellent results; the customization of femoral rotation with a blended technique is, probably, the key to optimize the outcomes and achieve the state of forgotten knee.
KeywordsCT measurement TKA rotation Personalized TKA design Measured resection and gap balancing Blended technique with tensor
Compliance with ethical standards
Ethical committee approval was obtained for this study (protocol number 20150003437).
Conflict of interest
The first Author (FB) is part of the design team of the implant. The other authors (MG, GD, CK, SMPR, and SP) declare that they have no conflict of interest. The study is a spontaneous observational investigation carried out by the Authors.
- 8.Ghiara M, Combi A, Perticarini L, Rossi SMP, Benazzo F (2013) Patient reported outcome measures in the new persona total knee arthroplasty. J Orthop Trauma 14(Suppl 1):S109–S110Google Scholar
- 9.Ghiara M, Combi A, Perticarini L, Rossi SMP, Benazzo F (2013) Short term follow-up in the new persona total knee arthroplasty. J Orthop Trauma 14(Suppl 1):S111Google Scholar
- 16.Moon YW, Kim HJ, Ahn HS, Park CD, Lee DH (2016) Comparison of soft tissue balancing, femoral component rotation, and joint line change between the gap balancing and measured resection techniques in primary total knee arthroplasty. A meta-analysis. Medicine 95(39):e5006. https://doi.org/10.1097/MD.0000000000005006 CrossRefGoogle Scholar
- 20.Saragaglia D, Rubens-Duval B, Gaillot J, Lateur G, Pailhé R (2018) Total knee arthroplasties from the origin to navigation: history, rationale, indications. Int Orthop. https://doi.org/10.1007/s00264-018-3913-z