caa a22 4500 605457387 CHVBK 20210128100223.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s00167-014-2839-2 doi (NATIONALLICENCE)springer-10.1007/s00167-014-2839-2 Improved positioning of the tibial component in unicompartmental knee arthroplasty with patient-specific cutting blocks [Elektronische Daten] [M. Dao Trong, C. Diezi, G. Goerres, N. Helmy] Purpose: Unicompartmental knee arthroplasty (UKA) has recently regained popularity for the treatment of osteoarthritis of the knee. Numerous authors have cited alignment as an important prognostic factor in the survival of UKA. Limb alignment affects not only the longevity of UKA by influencing wear of polyethylene, but also affects the unreplaced contralateral compartment. Malpositioning of the components may result in unequal wear patterns, thus further leading to early failure and additionally influencing clinical outcome as well. However, there is a lack of techniques to assure a high accuracy of the implant positioning. Methods: In this study, we investigated tibia component alignment of 28 medial UKAs implanted with patient-specific cutting blocks. Three patients were excluded due to bad imaging. Measurements of tibial component alignment from postoperatively computed tomography (CT) scans were compared to respective CT-based preoperative plannings to assess the accuracy of implant positioning. Results: Our results show excellent high accuracy of tibial implant position in tibial varus/valgus (Δ 0.3°±1.7°), posterior slope (Δ 1.1°±2.6°) and external rotation (Δ 1.5°±3.3°). Conclusion: We conclude that patient-specific cutting blocks improve the accuracy of tibia component positioning in unicompartmental knee arthroplasty. Level of evidence: Case series with no comparison group, Level IV. Springer-Verlag Berlin Heidelberg, 2014 Unicompartmental knee arthroplasty nationallicence Computed tomography nationallicence Alignment nationallicence Rotation nationallicence Patient-specific cutting blocks nationallicence Dao Trong M. Department of Orthopedic Surgery, Bürgerspital Solothurn, Schöngrünstrasse 42, 4500, Solothurn, Switzerland aut Diezi C. Department of Orthopedic Surgery, Bürgerspital Solothurn, Schöngrünstrasse 42, 4500, Solothurn, Switzerland aut Goerres G. Department of Radiology, Bürgerspital Solothurn, Schöngrünstrasse 42, 4500, Solothurn, Switzerland aut Helmy N. Department of Orthopedic Surgery, Bürgerspital Solothurn, Schöngrünstrasse 42, 4500, Solothurn, Switzerland aut Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/7(2015-07-01), 1993-1998 0942-2056 23:7<1993 2015 23 167 https://doi.org/10.1007/s00167-014-2839-2 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00167-014-2839-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dao Trong M. Department of Orthopedic Surgery, Bürgerspital Solothurn, Schöngrünstrasse 42, 4500, Solothurn, Switzerland aut NATIONALLICENCE 700 1- Diezi C. Department of Orthopedic Surgery, Bürgerspital Solothurn, Schöngrünstrasse 42, 4500, Solothurn, Switzerland aut NATIONALLICENCE 700 1- Goerres G. Department of Radiology, Bürgerspital Solothurn, Schöngrünstrasse 42, 4500, Solothurn, Switzerland aut NATIONALLICENCE 700 1- Helmy N. Department of Orthopedic Surgery, Bürgerspital Solothurn, Schöngrünstrasse 42, 4500, Solothurn, Switzerland aut NATIONALLICENCE 773 0- Knee Surgery, Sports Traumatology, Arthroscopy Springer Berlin Heidelberg 23/7(2015-07-01), 1993-1998 0942-2056 23:7<1993 2015 23 167