MRI is more accurate than CT for patient-specific total knee arthroplasty

Patient-Specific Instrument Can Improve Functional and Radiographic Results during Learning Curve for Oxford Unicompartmental Knee Arthroplasty

“…However, few data are available about the efficacy of the PSI system in UKA. Frye et al 21 found a greater precision in alignment when the system used MRI, as compared with computed tomography (CT). Jaffry et al 22 showed in knee models that a PSI CT system provided a greater precision in component alignment as compared with a conventional procedure and better rotational alignment of the tibial component as compared with a robotic arm.…”

Accuracy of MRI-based vs. CT-based patient-specific instrumentation in total knee arthroplasty: A meta-analysis

“…MRI-based PSI systems make use of high resolution images of the knee, with lower resolution images of the hip and ankle to develop the three-dimensional model. In contrast, CT-based systems use lower-resolution localisers in the sagittal plane, with high resolution images [11]. Furthermore, MRI-based cutting guides are registered by the surgeon over a broad surface area of the knee, including the remaining articular cartilage.…”

“…Furthermore, MRI-based cutting guides are registered by the surgeon over a broad surface area of the knee, including the remaining articular cartilage. This provides the surgeon with multiple points of reference to ensure appropriate registration of the cutting guide, allowing the cutting guides to sit more concentrically on patients' native anatomy, producing more accurate cuts [11]. On the other hand, CT-based guides are unable to account for the residual cartilage [8], and therefore, only a limited selection of bony landmarks are used to ensure the appropriate registration of the CT-based cutting guide.…”

“…Prospective comparative study 2 20 20 No significant difference in any plane Cenni [9] 2014 Prospective comparative study 2 23 21 No significant difference in any plane Ensini [10] 2014 Randomised controlled trial 1 23 22 More outliers with CT in the coronal plane Frye [11] 2015 Retrospective comparative 3 23 27 More outliers with CT in overall coronal alignment, and femoral sagittal alignment Pfitzner [12] 2014 Randomised controlled trial 1 30 30…”

Structure-enhanced local phase filtering using L0 gradient minimization for efficient semiautomated knee magnetic resonance imaging segmentation

“…It has recently been suggested that MRI scans of the knee provide results that are comparable to computed tomography scans for patient-specific TKA. [5][6][7][8][9] Nonetheless, MRI has some problems as well, such as low contrast between bone and surrounding tissue, and noise. The development of algorithms that allow for automatic and semiautomatic segmentation of MRIs has, therefore, been the focus of much research.…”