Table 1
Functional Alignment Philosophy Protocol Guidelines for the varus morphotype.
Parameter | Target |
---|---|
Final coronal alignment (HKA) | 174°–180° |
Final sagittal alignment with gravity only | 0° ± 5° |
Femur | |
Varus/valgus* | 3° varus to 6° valgus |
Flexion* | 0°–10° |
Rotation (PCA) | 0° IR–6°ER |
Transepicondylar axis (TEA) | 3° IR–6° ER |
Tibia | |
Varus/valgus* | 0°–6° varus |
Slope* | 0°–3° (depends if CR/CS or PS) |
Rotation | Manual |
Combination of Akagi’s line, anatomic fit and floating method | |
JLO and height | JLO orientation to not be changed to different phenotype (CPAK) |
Final joint line height ±3 mm from native | |
Implant sizing | Femur – matched to curvature of distal femoral radius to avoid notching and medial-lateral condyles to avoid any overhang or over-stuffing |
Tibia – maximal cortical contact with correct rotation with no overhang | |
Downsized if there is any conflict | |
Balancing | Gaps to match the global thickness of the implant at:
|
Maximum gap difference 1 mm between medial and lateral compartments with a slight lateral laxity acceptable |
*Combined values between tibia and femur more important than isolated values. Individual manufacturing guides may vary between implants.
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