A New Method which Enables Precise Patella Resection in Total Knee Arthroplasty.

The role of patient, surgical, and implant design variation in total knee replacement performance

“…2). Values for each parameter were randomly generated based on a normal distribution, with variability levels quantified from values reported from clinical studies or in prior computational work (Srivastava et al, in press;Fitzpatrick et al, 2012;Dennis et al, 2010;Heegaard et al, 2001;Maestro et al, 1998;Nagamine et al, 2001;Akagi et al, 1999;Lee et al, 1999;Anouchi et al, 1993;Gomes et al, 1988; Table 1). …”

Finding and defining the ideal patellar resection plane in total knee arthroplasty

“…1a) (Malo and Vince, 2003;Nagamine et al, 2001) and from the medial to lateral extents (MLE; Fig. 1b) (Pagnano and Trousdale, 2000;Ledger et al, 2005;Nagamine et al, 2001;Eisenhuth et al, 2006). By definition, ANT should produce equal medial and lateral thicknesses as desired, but several difficulties affect practical implementation: the surgeon must mentally shift the anterior plane to where the cut is made; the surface is curved or irregular not flat; and confirmation of symmetry using the thumb and forefinger lacks good precision (DeOrio and Peden, 2004).…”

“…1a) (Malo and Vince, 2003;Nagamine et al, 2001) and from the medial to lateral extents (MLE; Fig. 1b) (Pagnano and Trousdale, 2000;Ledger et al, 2005;Nagamine et al, 2001;Eisenhuth et al, 2006).…”

“…By definition, ANT should produce equal medial and lateral thicknesses as desired, but several difficulties affect practical implementation: the surgeon must mentally shift the anterior plane to where the cut is made; the surface is curved or irregular not flat; and confirmation of symmetry using the thumb and forefinger lacks good precision (DeOrio and Peden, 2004). The MLE method also has problems with practical implementation: the points are difficult to find intraoperatively; they may not be parallel to the anterior surface (Nagamine et al, 2001); and the points are difficult to confirm once the resection is made. A tendon-landmark approach has also been reported (Ledger et al, 2005;Shakespeare, 2006;Lombardi et al, 1998;Lee and Kim, 1998) but is not suitable for radiographic analysis.…”

Combined probabilistic and principal component analysis approach for multivariate sensitivity evaluation and application to implanted patellofemoral mechanics

“…3). Each parameter was assumed to be normally distributed, with means and standard deviations based on variability quantified in experimental studies (Lee et al, 1999(Lee et al, , 2004Nagamine et al, 2001;Chan and Gill, 1999;Akagi et al, 1999;Anouchi et al, 1993;Gomes et al, 1988) or assessed in computational studies (Kessler et al, 2008;D'Lima et al, 2003;Heegaard et al, 2001) (Table 1). The probabilistic analysis predicted the 5% and 95% bounds of six-degree-of-freedom PF kinematics, contact mechanics (area and pressure), von Mises stress and M-L contact force at 80 intervals throughout the flexion cycle.…”