Table 1
Functional positioning protocol guidelines in medial unicompartmental knee arthroplasty [HKA: hip-knee-ankle angle; JLO: joint line obliquity; CPAK: coronal plane alignment of the knee].
| Parameter | Target |
|---|---|
| Final coronal alignment (HKA) | 175°–180° |
| Final sagittal alignment with gravity only | 0° ± 5° |
| Femur | |
| Varus/valgus | Femoral resurfacing aims to obtain centered contact points between the femoral and tibial implants throughout the full range of motion |
| Flexion | |
| Rotation | |
| Tibia | |
| Varus/valgus | Cartier’s angle ±3° |
| Slope | 2°–10° |
| Rotation | Alignment of the implant’s lateral edge with the lateral cortex axis of the medial femoral condyle |
| JLO and height | JLO orientation to not be changed to different phenotype (CPAK) |
| Final joint line height ±2 mm from native | |
| Balancing | 1–2 mm of final medial laxity |
Goal:
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