Related Experiment Video
Updated: May 14, 2026
A Teleoperated Robotic System-Assisted Percutaneous Transiliac-Transsacral Screw Fixation Technique
Published on: January 6, 2023
Use of robotic technology in cam femoroacetabular impingement corrective surgery
Milad Masjedi1, Wei Liang Tan, Sunnar Jaskaranjit
1MSK lab, Imperial College London, Department of Orthopaedics, Charing Cross Hospital, London, UK. m.masjedi@imperial.ac.uk
Background:
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.
Methods:
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.
Results:
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.
Conclusions:
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.
