Table 2.
Radiographic outcomes for cases in Group 1*
| Radiographic measurement | Value |
|---|---|
| Thickness patella bone on lateral radiograph (mm) | 12 (5–21) |
| Thickness patella bone on skyline radiograph (mm) | 13 (6–20) |
| Percent of patella covered by implant on lateral radiograph | 89 (68–101) |
| Percent of patella covered by implant on skyline radiograph | 77 (58–96) |
| Mean Insall-Salvati ratio | 1.00 (0.37–1.45) |
| Mean Blackburne-Peel ratio | 0.61 (0.26–1.19) |
| Average tilt patella to femur (degrees) (positive values = lateral tilt, negative values = medial tilt) | 4.9 (−11–18) |
| Average tilt implant to patella (degrees) | −1 (−10–8) |
* Excluding revisions and radiographic loosening of patella implant; values are expressed as means, with ranges in parentheses.