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Computer-assisted navigation in TKA aids accuracy for neutral alignment, bone resections

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The use of a computer-assisted navigation system achieved good postoperative knee alignment after total knee arthroplasty, according to two presenters at the International Society for Computer Assisted Orthopaedic Surgery Annual Meeting.

“The fact that we can formulate a virtual surgical plan and then validate that plan’s execution with an average of less than 5 minutes added per case with an extreme level of accuracy demonstrates the effectiveness of real time navigation and robotics for total knee replacement,” Jan A. Koenig, MD, stated in a press release.

Koenig and colleagues used the APEX Robotic Technology (Omni Life Science; East Taunton, Mass.), or ART system, in 128 total knee arthroplasties (TKAs) that were grouped according to their coronal plane deformity. Patients were divided into neutral or mild deformity (<10°), severe varus (≥10°) and severe valgus (≥10°) groups, according to the abstract. At final follow-up, they found the degree of correction for coronal malalignment could be corrected within 3° to 4° consistently.

A second paper by Corey E. Ponder, MD, and colleagues examined the use of the ART system as a cutting guide in press-fit TKA. Ponder and colleagues used the ART system to cut synthetic bones and found the positioning precision of the system was “sub-degree and sub-millimetric, allowing for significantly more accurate and repeatable bone resections than conventional instrumentation,” according to the abstract.

References:

Koenig JA. Influence of preoperative deformity on surgical accuracy and time in robotic-assisted TKA. Presented at: International Society for Computer Assisted Orthopaedic Surgery Annual Meeting. June 12-15, 2013; Buena Vista, Fla.

Ponder CE. Press-fit total knee arthroplasty with a robotic-cutting edge guide: Proof of concept and initial clinical experience. Presented at: International Society for Computer Assisted Orthopaedic Surgery Annual Meeting. June 12-15, 2013; Buena Vista, Fla.

Disclosures: Koenig receives royalties from Omni Life Science, is on the speaker’s bureau for and is a paid consultant for Omni Life Science and Medtronic. Ponder is on the speaker’s bureau for and is a paid consultant for Biomet, Omni Life Science, Salient Surgical and MAKO Surgical and receives stock options for TJO and MAKO Surgical.