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Table 1 Radiographic quality criteria

From: Anterior tibial displacement on preoperative stress radiography of ACL-injured knee depending on knee flexion angle

1. Strict lateral X ray (posterior intercondylar distance < 5 mm)
2. knee joint flexion angle within ±5°
3. incident ray at the height of the joint space linking the two tibial plateau
4. x ray radiographically clear
5. well adapted piston position (behind the proximal metaphysis of the tibia)