Referencing the substitute anteroposterior line of the tibia improves rotational alignment of the tibial component in medial unicompartmental knee arthroplasty

The Knee ◽  
2020 ◽  
Vol 27 (5) ◽  
pp. 1458-1466
Author(s):  
Ichiro Tsukamoto ◽  
Masao Akagi ◽  
Shigeshi Mori ◽  
Shinji Inoue ◽  
Koichi Nakagawa ◽  
...  
Keyword(s):  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Tibial Component ◽  
Rotational Alignment ◽  
Unicompartmental Knee ◽  
Medial Unicompartmental Knee Arthroplasty

scholarly journals Feasibility of a Novel Tibial Sighting Device Combined with Intramedullary Femoral Localisation on the Rotational Alignment of the Tibial Component for Oxford Unicompartmental Knee Arthroplasty

2020 ◽  
Author(s):  
Linjian Chen ◽  
Xiang Liu ◽  
Chaohui Li ◽  
Zhen Luo ◽  
Qiyuan Chen
Keyword(s):  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Tibial Component ◽  
Test Group ◽  
Conventional Technique ◽  
Rotational Alignment ◽  
Control Group ◽  
Tibial Osteotomy ◽  
Unicompartmental Knee ◽  
Number Of Patients

Abstract Background：The success of unicompartmental knee arthroplasty (UKA) depends on perfect prosthesis component alignment. However, it is difficult to identify the anteroposterior axis and implant components in the correct rotational position in a narrow operating field in a UKA. Thus, we invented a novel tibial sighting device and explored whether combining it with intramedullary femoral localisation could be feasible on the rotational alignment of the tibial component for the Oxford UKA.Methods: Twenty consecutive knees were treated with UKA using a novel tibial sighting device combined with intramedullary femoral localisation. An equal number of patients who underwent UKA with the conventional technique were matched to the control group. Radiographic accuracy was evaluated based on the implant position in the tibial CT transverse sections. The α angles were measured between the tibial component line and the vertical line of TEA', which was projected to the trans-epicondylar axis (TEA).Results: The absolute value of the test group’s α angle was significantly smaller than the respective values of the control group (P=0.006). The ratio of △α > 3° in the test group was also significantly smaller than that of the control group (P=0.048).Conclusion: The novel tibial sighting device combined with intramedullary femoral localisation provided the surgeon a better surgical view in sagittal tibial osteotomy and improved the accuracy of tibial implant alignment in UKA. This method makes the vertical osteotomy of the tibial platform simpler, more precise and highly repeatable.

scholarly journals All-Polyethylene Tibial Component Does Not Affect Survivorship of Medial Unicompartmental Knee Arthroplasty at Mid-Term Follow-Up

2020 ◽  
Author(s):  
Michele Gagliardi ◽  
Francesco Zambianchi ◽  
Alois Franz ◽  
Vitantonio Digennaro ◽  
Fabio Catani
Keyword(s):  
Knee Arthroplasty ◽  
Unicompartmental Knee Arthroplasty ◽  
Tibial Component ◽  
Varus Deformity ◽  
Implant Positioning ◽  
Unicompartmental Knee ◽  
Kaplan Meier ◽  
Medial Unicompartmental Knee Arthroplasty

AbstractThe present study's primary aim was to determine the survivorship of a large cohort of patients implanted with a single design all-polyethylene tibial component medial unicompartmental knee arthroplasty (UKA). Its secondary purpose was to investigate the reasons underlying implant failure, with specific attention to component positioning and limb alignment. Between 2007 and 2013, 166 patients underwent medial UKA with a single design all-polyethylene tibial component at two centers. Preoperatively and postoperatively, patients were administered clinical outcome scores and radiographic information were collected. Postoperative complications and causes of revision were recorded. A total of 140 patients (80 in Center A and 60 in Center B) who underwent all-polyethylene tibial component medial UKA (82 cases in Center A and 60 in Center B) were taken into account. Kaplan–Meier cumulative survivorship of implants was 96.5% (confidence interval [CI]: 91.7–98.6%) at an average follow-up of 61.1 months. Tibial aseptic loosening was accounted for failure in one case, while no correlation was found between implant positioning and failure. Two revisions were performed in Center A and three in Center B. Slight correction of the preoperative varus deformity was performed at both centers. All-polyethylene tibial component UKA provided satisfactory clinical and functional outcome, with excellent survival rate in the early and mid-term follow-up. Continued patient follow-up is needed to determine long-term survivorship of the examined UKA model.

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