We describe our modified anterior mini-invasive technique and results obtained in our first consecutive 117 cases in 105 patients. To assess the influence of preoperative Tönnis degenerative stage, cases were divided into group A (Tönnis 0, 32 hips), B (Tönnis 1, 61 hips), and C (Tönnis 2, 24 hips). The clinical score Dexeus combined score (DCS) was used preoperatively, 3 months, 6 months, and every year after operation. At 3-month follow-up, impingement test results improved significantly in 30 hips of group A (94%; p<0.001) and in 58 of group B (95%; p<0.001), whereas in group C, improvement was observed in only 14 cases (58%; p>0.05). No statistical difference was observed at 3-year visit in all groups. Merle d'Aubigné-Postel and WOMAC scores improved significantly in group A (p<0.001) and B (p<0.001) after 1 year and remained unchanged at subsequent yearly follow-ups. For group C, clinical outcomes scores did not show any significant improvement overall (p>0.05). We concluded that anterior mini-invasive technique is an effective method to treat femoroacetabular impingement, and results are highly influenced by preoperative degenerative state, especially in stage Tönnis 2. Therefore, it seems to be a reasonable early surgical treatment in symptomatic patients.
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