Fig. 3.
a Matrix shows the alignment possibilities offered by the Origin® system. A primary tolerance of ± 3° for the femoral and tibial cuts, which were planned to achieve a range of mechanical angles from 87° to 93° (yellow area). A secondary tolerance of ± 2° for implant obliquity (polyethylene insert and femoral condyles), which extended the total range of mechanical angles from 85° to 95° (Orange area). b ‘Target zone’ (Yellow area) respecting the 85° to 95° range for FMA and TMA, and the 175° to 183° range for HKA angle