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Use of robotic technology in cam femoroacetabular impingement corrective surgery


Correspondence to: Milad Masjedi, MSK lab, Imperial College London, Department of Orthopaedics, Charing Cross Hospital, Fulham Place Road, London W6 8RF, UK. E-mail:



Cam type femoroacetabular impingement (FAI) is an anatomical disorder that can lead to osteoarthritis (OA) of the hip joint. With existing surgical options there is invariably a tendency for under-resection or over-resection of the cam lesion, both having dire consequences. This study assessed the application of robotic technology in the surgical management of cam FAI.


Three different dry-bone femur models (14 in each) with severe cam deformity underwent corrective surgery using a haptic robot with active constraints. The ‘post surgery’, models were CT scanned and 3-D alpha angles and head/neck ratios (HNRs) were compared with pre-operative plans.


In all models, the robotic resection resulted in a measured reduction of the maximum alpha angle to an angle indicative of no clinical impingement (first model 91° vs 49° ± 3°, second 91° vs 55° ± 5°, and third 87° vs 47° ± 2° P < 0.001). Similarly, the HNRs for all models reduced substantially following resection surgery.


This dry bone study validates the use of robotic technology to perform cam FAI corrective surgery. A more accurate bony resection may minimize complications due to over- and under-resection. Copyright © 2013 John Wiley & Sons, Ltd.