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We report on a consecutive series of patients with cam type FAI (femoro-acetabular impingement) with acetabular cartilage rim lesions larger than 150 mm that were treated with an arthroscopic AMIC (Autologous Matrix Induced Chondrogenesis) procedure and compared these patients to a matched cohort of patients who underwent an arthroscopic microfracturing. The AMIC group consisted 16 patients with a mean age of 34. Mean follow up is 38 months. Sixteen age and sex controlled patients who underwent an arthroscopic microfracturing of a similar size cartilage lesion were used as a comparative study group with a mean follow up of 41 months. No complications and no adverse reactions were seen, and all patients would have the same surgery again. We report 2 failures in the AMIC group with conversion to THR (Total Hip Replacement) at 8 and 36 months, respectively. In the microfracturing group, there were 3 conversions to THR after 12, 14 and 24 months. The HHS (Harris Hip Score) was 96.5 in the AMIC group and 93.5 in the microfracturing group. Patients had significantly less symptomatic synovitis postoperatively in the AMIC group and more athletes could resume their activities to the pre-injury level in this group. In conclusion, AMIC offers promising results in the treatment of cartilage lesions in patients with cam-type FAI.

Arthroscopic Treatment of Acetabular Cartilage Lesions in Cam-Type Hip Impingement with Membrane Induced Chondrogenesis versus Microfracturing