TITLE

Computer-Assisted Correction of Cam-Type Femoroacetabular Impingement

AUTHOR(S)
Almoussa, Sulaiman; Barton, Cefin; Speirs, Andrew D.; Gofton, Wade; Beaulé, Paul E.
PUB. DATE
May 2011
SOURCE
Journal of Bone & Joint Surgery, American Volume;5/4/2011 Supplement, Vol. 93-A, p70
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Background: Assessing the adequacy of bone resection when correcting cam-type femoroacetabular impingement can be difficult when the surgeon is inexperienced or when less-invasive arthroscopic surgical techniques are used. The primary purpose of the present study was to compare, using a Sawbones model, the results of computer-assisted navigated osteochondroplasty of the femoral neck junction with correction with use of femoral head spherometer gauges. The second objective was to compare the results of computer-assisted osteochondroplasty performed by surgeons who had varied experience with the procedure. Methods: We calculated and compared the post-resection alpha angle in custom-molded Sawbones models with camtype impingement following both surgical techniques, performed by three surgeons with varied experience with the procedure. The alpha angle was measured at two positions (the three o'clock and one-thirty positions of the femoral headneck junction) before and after resection. Results: At the three o'clock position, there were no significant differences between the computer-navigation and spherometer groups (p = 0.83). There was undercorrection at the one-thirty position, with the median alpha angle being greater in the navigation group as compared with the spherometer group (71.0 compared with 58.6; p = 0.05). In the navigation group, there were no significant differences in the post-resection mean alpha angle among the three surgeons at either the one-thirty plane or the three o'clock plane. Conclusions: Navigation enabled the inexperienced surgeon to perform an equivalent amount of bone resection as the more experienced surgeons. However, all surgeons did not sufficiently resect the cam deformity as compared with the gold-standard open technique at the one-thirty position. Clinical Relevance: The limitations of computer-assisted surgery should be understood, and adequate training for surgical correction of cam-type femoroacetabular impingement remains essential.
ACCESSION #
60523739

 

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