Early Results & Accuracy of the MAKO Robtic Unicompartmental Knee Replacement

OBJECTIVES: To monitor the “learning curve” and assess the accuracy of implantation, safety and early results of a new to Australia, technique for unicompartmental knee replacement METHODS: After cadaveric training, the first 50 MAKO unicompartmental replacements, performed by 5 surgeons, were studied. Operative details were recorded including time taken for each step in the surgical procedure. Pre and post operative Knee Society Score (KSS), Oxford knee score (OKS) and WOMAC were recorded. 19 had post-operative CT scans with segmentation using planning software to determine accuracy of implantation compared to plan. RESULTS: In the small number studied there was no evidence of a significant “learning curve” with no significant change in operative times. The procedure proved safe without any failure of technology. At 3 months there was a significant improvement in KSS, WOMAC and OKS. The unicompartmental replacements were inserted with a high degree of accuracy, comparable to other centres and with greater accuracy then reported implantation using “standard” instruments. CONCLUSION: New robotic technology was able to be introduced safely without a significant learning curve and with satisfactory early results. The technique allowed highly accurate component positioning.