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Load-displacement relationships in a stable control knee (left) and an unstable knee after partial ACL transection (right). Sagittal plane stability was quantified in terms of anterior drawer stiffness (ADS: regression slope from +7.5 N to the maximum force) and neutral zone length (NZL: displacement length between ±7.5 N data points). Higher instability was characterized by a decrease of anterior drawer stiffness and an increase of neutral zone length.
