Patient Specific Guides in Total Knee Arthroplasty-Are They Accurate in Restoring Mechanical Alignment? A Prospective Clinical Series of 175 Cases

Eugene Chung, Rahij Anwar, Sunil Gurpur Kini, Warwick Bruce


Background: Our study looked to see if patient specific guides in TKA restored mechanical alignment in patients with osteoarthritis.

Materials and Methods: This prospective study measured the coronal alignment using long leg radiographs in 175 TKAs performed using patient specific cutting blocks. All patients underwent a posterior stabilizing TKA (Smith & Nephew GENESIS II) by the senior surgeon (WB) using Visionaire cutting blocks (based on pre-operative MRI studies).

Results: The mechanical axis of the knee joint was measured using long leg radiographs taken six weeks post-operatively. There were no adverse intraoperative events. The coronal axis was restored to within 3° of neutral in 144 of 168 knees (85.7%).

Conclusion: We conclude that patient specific instrumentation is accurate in restoring mechanical alignment in patients undergoing TKA.


Patient specific guides; Knee; Arthroplasty; Alignment

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