In a long-term follow-up of 88 patients with complex ligament knee injuries we examined 70 of these who were operated upon between 1.4. 1988 and 31.3. 1990. We specifically looked at local complications, clinical results and knee stability, using subjective and arthrometrical (KT-1000) results 1 or 2 years after operation. The only parameters with a good correlation with stability were the clinical examination (Lachman-test) and the results with the arthrometer in the anterior-posterior translation. Stability after ACL-reconstruction with augmentation with a polydiaxonaon (PDS) augmentation band was physiological (2 mm under 89 N anterior-posterior traction) in 77% of all knees but only in 57% under maximal anterior-posterior manual stress. Neither the subjective outcome of Lysholm-Score correlated with arthrometry and clinical examination.