J Korean Orthop Assoc.  2018 Aug;53(4):307-315. 10.4055/jkoa.2018.53.4.307.

Morphologic Changes of Femoral Cam Lesion after Osteoplasty for Femoroacetabular Impingement

  • 1Department of Orthopedic Surgery, Soonchunhyang University Gumi Hospital, Gumi, Korea.
  • 2Department of Orthopedic Surgery, Chungnam National University School of Medicine, Daejeon, Korea. dshwang@cnu.ac.kr
  • 3Department of Orthopedic Surgery, Yanbian University Hospital, Yanji, China.


We evaluated the morphologic change of cam lesion of femoroacetabular impingement (FAI) using 3-dimensional computed tomography (3D-CT) at the minimum 2-year follow-up and estimated its relationship with clinical outcomes.
Between February 2007 and March 2014, all patients who underwent hip arthroscopic femoroplasty under the impression of FAI were retrospectively evaluated. We selected patients who received 3D-CT and were followed-up for more than 2 years. We estimated the quantitative volume of femoroplasty, alpha angle and femoral head-neck offset using 3D-CT.
Thirty-two patients (37 cases) were selected in our study. The mean age was 31.2 years (16–69 years) and the mean follow-up duration was 47.3 months (26–119 months). The mean resection volume measured after femoroplasty using 3D-CT was 48.9 mm2 (13.2–106.4 mm2), and follow-up mean resection volume was 37.9 mm2 (7.83–90.37 mm2). A little bit of the mean volumatic overgrowth of the resection area between immediate postoperative and last follow-up was shown; however, there was no statistically significant difference in the mean values (p>0.05). The clinical outcomes showed a significant improvement during the perioperative and follow-up periods in all categories (p < 0.05).
There was no significant regrowth of cam lesion after femoroplasty for FAI at maximum 9 years. Moreover, in most cases, clinical outcomes were improved. This suggests that we were able to achieve good clinical outcomes without harmful anatomical regrowth of cam deformity using arthroscopic femoroplasty.


hip arthroscopy; femoroacetabular impingement; cam lesion; femoroplasty
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