Tibial component rotation assessment using CT scan in medial and lateral unicompartmental knee arthroplasty

Objective This study was performed to investigate the influence of a standard Oxford vertical cut on the coronal coverage and rotation of the tibial component and determine whether a relationship exists between coverage and rotation. Methods We retrospectively analyzed 71 patients with anteromedial osteoarthritis of the knee treated by Oxford unicompartmental knee arthroplasty in one center from October 2016 to October 2017. The distance of coronal coverage was measured on a postoperative anteroposterior view of the tibial component. Two different reference lines between the lateral wall of the tibial component were defined as rotation angle α and β, respectively, on a computed tomography scan. Results The mean distance was 0.3 ± 1.1 mm. The mean angle α and β were 5.7° ± 4.6° and 8.4° ± 4.6°, respectively. There were no significant differences in the distance according to the tibial component rotation or in the α and β angles according to the coronal coverage. No significant correlation was found between the α and β angles and the distance. Conclusion A standard tibial vertical cut caused various changes in coronal coverage and rotation of the tibial component. The rotation of the tibial component did not affect coverage within a certain range.

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Alignment of the tibial component of the unicompartmental knee arthroplasty, assessed in the axial view by CT scan: does it influence the outcome?

The Knee ◽

10.1016/j.knee.2014.06.008 ◽

2014 ◽

Vol 21 (6) ◽

pp. 1269-1274 ◽

Cited By ~ 22

Author(s):

Iker Iriberri ◽

José Francisco Aragón

Keyword(s):

Ct Scan ◽

Knee Arthroplasty ◽

Unicompartmental Knee Arthroplasty ◽

Tibial Component ◽

Unicompartmental Knee ◽

Axial View

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Femoral component rotation angle after unicompartmental knee arthroplasty using the anatomical tibial component cutting technique with computer-assisted surgery by CT-scan

10.29007/3cm2 ◽

2019 ◽

Author(s):

Kittikun Thienthong ◽

Pornpavit Sriphirom ◽

Anuchit Vejjaijiva ◽

Soros Suwansawaiphol

Keyword(s):

Ct Scan ◽

Internal Rotation ◽

Femoral Component ◽

Knee Arthroplasty ◽

Unicompartmental Knee Arthroplasty ◽

Rotation Angle ◽

Computer Assisted ◽

Femoral Component Rotation ◽

Unicompartmental Knee ◽

Component Rotation

Complication following UKA in medial compartment OA knee often related to rotatory malposition of the femoral component The purpose of this study was to study outcome following Femoral component rotation angle after unicompartmental knee arthroplasty using the anatomical tibial component cutting technique with computer-assisted surgery by CT-scan measurement in Rajavithi hospitalRetrospective descriptive study of 16 patients performed medialUKA in Rajavithi Hospital Bangkok Thailand.Single orthopedic surgeon and using computer-assisted with anatomical tibia cutting technique(tibial resection in 3-degree varus).The femoral component rotation was assessed in an axial cut CT scan. measure angle between Epicondylar axis and Posterior condylar axisThe authors analyzed 16 knees with mean age about 56 years, male 2 Female 14 and the mean BMI was 24 kg/m 2 (average body weight 63 kg)Mean of Femoral component rotation angle in this study is 2.94-degree internal rotation(internal rotation compare with Epicondylar axis). A range of femoral component internal rotation was 0-6 degree .mean varus-valgus angle was 1.81-degree varus and mean flexion-extension angle was 5.56-degree flexionFemoral component rotation angle in unicompartmental knee arthroplasty(UKA) in medial compartment osteoarthritis knee with using of the computer-assisted with anatomical tibia cutting technique have a favorable result (Mean = 2.94-degree internal rotation 1.81-degree varus and 5.56-degree flexion).

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