Abstract
Introduction
Total knee arthroplasty (hereinafter TKA), it is thought that the setting position of each component and the angle have a big influence on surgical results. Preoperative planning with accurate and detailed 3D templates are has been done in many facilities in TKA. However, in the setting position, the 2D evaluation with X-rays is still common after operation, and there are few facilities going in 3D image. A three-dimensional evaluation method of the TKA includes a rating system using CT and the MRI, but influence (artifactual) with the metal occurs, and a detailed evaluation becomes difficult. In this study, we evaluated it after the matching method with the 3D plan using “Physio-Knee” where the materials of the femoral component were alumina ceramics in the preoperation of each component setting position by the CT before and after operation.
Patients and methods
We intended for 12 knees which we performed TKA used the Physio-Knee by December, 2011 from October, 2010. The all cases woman, the operation average age were 68.9 years old (62 to 79 years). For these, we performed CT photography of the whole lower limbs after operation like preoperation and each component setting was located after operation using evaluation software made in LEXI company and evaluated it.
Results and Discussion
Like 2D evaluation result, as for one, the error with the plan did not recognize errors more than 3 degrees at the setting angle of the each component in the coronal and sagittal plane in preoperation either. A detailed evaluation was possible about the slightly difficult rotation by the 2D evaluation. As for the 3D image matching method that we performed this time, a visual instant evaluation was possible and, in addition, the evaluation of the rotation position was possible and was able to evaluate it in detail and precisely more in comparison with conventional 2D evaluation.
A conclusion
In TKA, we think to evaluate correct implant setting, acquisition to alignment that the 3D image matching method that we performed this time is a useful tool.
