The analysis of 582 consecutive navigated total knee arthroplasties showed one case of extension gap instability > 3 mm (0.2%) and 8 patients with flexion gap instability > 3 mm (1.4%). A too tight flexion gap was registered in 23 patients (4.4%), a too wide flexion gap in 13 cases (2.5%). The joint line was reconstructed with an average inaccuracy of 0 mm, in 17 patients the joint line was elevated > 3 mm (2.9%).
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