GATOR Pro
ML-quantified pivot-shift grade from a patient-performed sit-stand-sit. The device that started PreciX.
What it measures.
Peak external rotation
Maximum outward tibial rotation relative to the femur during the sit-to-stand cycle (°). Higher magnitudes indicate greater rotational capacity.
Peak internal rotation
Maximum inward tibial rotation during the movement cycle (°). Reduced magnitude on the affected side may indicate rotational restriction.
Total IE rotation ROM
Total internal-to-external rotation arc across the full sit-to-stand cycle. The single strongest predictor used by the ML pivot-shift model.
Screw-home magnitude
Terminal external tibial rotation as the knee approaches full extension — the physiological locking mechanism. Reduced screw-home on the affected side is a hallmark of ACL deficiency.
Rep-to-rep CV
Coefficient of variation across repeated sit-to-stand cycles. Higher CV reflects neuromuscular instability or compensatory strategies.
Pivot-shift grade equivalent
ML-derived 0–III grade with a confidence score, trained on IMU + ultrasound data against ACL-intact and ACL-deficient reference cohorts. Held-out AUC 0.89 for low- vs high-grade classification.
IKDC subjective evaluation
Patient-reported score (/100) across symptoms, sports activity, and knee function — captured alongside the kinematic assessment.
Selected ultrasound frames
B-mode ultrasound bone-tracking frames from the session, attached to the signed report for surgeon review.
Every number.
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