Reliability of Imageless Computer-Assisted Navigation for Femoral Rotational Alignment in Total Knee Arthroplasty
https://doi.org/10.5704/MOJ.2103.012
- Author:
Leelasestaporn C
1
;
Thuwapitchayanant M
1
;
Sirithanapipat P
2
;
Sa-ngasoongsong P
3
;
Ruengsilsuwit P
1
Author Information
1. Department of Orthopaedic Surgery, Bhumibol Adulyadej Hospital, Bangkok, Thailand
2. Department of Total Joint Replacement Center, Vejthani Hospital, Bangkok, Thailand
3. Department of Orthopaedic, Ramathibodi Hospital, Bangkok, Thailand
- Publication Type:Journal Article
- Keywords:
CAS in TKA, femoral component rotation, navigation in TKA
- From:Malaysian Orthopaedic Journal
2021;15(No.1):79-84
- CountryMalaysia
- Language:English
-
Abstract:
Introduction: The aim of this study was to evaluate the
reliability of the femoral component rotation on intraoperative data recorded in a computer-assisted navigation
system (CAN-FRA) compared with the post-operative
femoral component rotation observed on computed
tomography (CT-FRA).
Material and method: Computer-assisted total knee
arthroplasty (TKA) or primary osteoarthritis of the knee was
performed in 51 knees in 36 patients with a mean age of
69.51 years. All procedures were performed by a single
surgeon using the same implant design. The intraclass
correlation coefficient (ICC) was used to compare the intraoperative CAN-FRA with the post-operative CT-FRA. The
angle between the anatomical epicondylar axis and the
posterior condylar axis of the implant (CT-FRA) was
measured at two separate timepoints by three observers who
were blinded to the intra-operative CAN-FRA. Internal
rotation was defined as rotation in the negative direction,
while external rotation was defined as positive.
Results: The mean intra-operative CAN-FRA was 0.1° ±
2.8° (range -5.0° to 5.5°). The mean post-operative CT-FRA
was -1.3° ± 2.1° (range -4.6° to 4.4°). The mean difference
between the CAN-FRA and the CT-FRA was -1.3° ± 2.2°
(range -7.9° to 2.4°). The respective ICC values for the three
observers were 0.92, 0.94, and 0.93, while the respective
intra-observer coefficients were 0.91, 0.85, and 0.90. The
ICC for the intra-operative CAN-FRA versus the postoperative CT-FRA was 0.71.
Conclusion: This study shows that using a computerassisted navigation system in TKA achieves reliable results
and helps to achieve optimal positioning of the femoral
component and rotation alignment correction.
- Full text:16.2021my1152.pdf
