OBJECTIVES This study aims to investigate discrepancy between posterior condylar axis (PCA)+3 degree external rotation (ER) line and clinical transepicondylar axis (cTEA) line and consistency between the both techniques in primary total knee arthroplasty. PATIENTS AND METHODS Thirty-six knees [Bilateral knees were operated simultaneously in 12 patients (50%)] in 24 patients [3 men (12.5%), 21...

BACKGROUND The failure to restore mechanical alignment and appropriate rotational axis intraoperatively has been described as one of the most common causes of implant failure in total knee arthroplasty (TKA). Both conventional and computer-assisted TKA have their limitations. Patient-specific jigs (PSJ) offer a possible alternative method for TKA. The aim of this study was to investigate if the...

Background The use of navigation for total knee arthroplasty (TKA) improves limb alignment in the coronal and sagittal planes. However, similar improvements in femoral and tibial component rotation have not yet been realized using currently available systems. Methods We developed a modified navigated TKA technique in which femoral rotation was set using the resected tibial plane as the refere...

The understanding of rotational alignment of the distal femur is essential in total knee replacement to ensure that there is correct placement of the femoral component. Many reference axes have been described, but there is still disagreement about their value and mutual angular relationship. Our aim was to validate a geometrically-defined reference axis against which the surface-derived axes co...

Abstract Aim Traditionally, the posterior condylar offset ration (PCOR) has been calculated from lateral radiographs however new evidence suggests that a measuring technique based on 3D imaging may be superior. MRI trialled, but no protocol standardised and evaluated for reliability. This study aims to create reproducible reliable as well exploring whether there are any morphological difference...

A controlled study, comparing computer- and conventional jig-assisted total knee replacement in six cadavers is presented. In order to provide a quantitative assessment of the alignment of the replacements, a CT-based technique which measures seven parameters of alignment has been devised and used. In this a multi-slice CT machine scanned in 2.5 mm slices from the acetabular roof to the dome of...

PURPOSE Conventional instruments are known to result in high numbers of outliers in restoring femoral component rotation primarily due to fixed degree of external rotation resection relative to the posterior condylar line (PCL). Outliers can be reduced by determining the patient specific posterior condylar angle (PCA) preoperatively or intraoperatively. There is a paucity of methods that can be...

This study evaluated the influence of modern tibial baseplate designs when using the anterior tibial cortex as a primary rotational landmark for the tibial baseplate in TKA. Eighty patients undergoing TKA were randomized in two groups. Group 1 included 25 females and 15 males receiving a posterior-stabilized (PS) symmetric tibial baseplate while Group 2 included 24 females and 16 males receivin...