CC BY-NC-ND 4.0 · Revista Chilena de Ortopedia y Traumatología 2023; 64(01): e11-e16
DOI: 10.1055/s-0043-1760861
Original Article

Evaluation of the Mini-open Treatment for CAM-type Femoroacetabular Impingement

Article in several languages: español | English
1   Departamento de Traumatología y Ortopedia, Hospital Dr. Sotero del Rio, Clinica MEDS, Santiago, Chile
2   Equipo de Cirugía Reconstructiva Articular, Complejo Asistencial Dr. Sótero del Río, Santiago, Chile
1   Departamento de Traumatología y Ortopedia, Hospital Dr. Sotero del Rio, Clinica MEDS, Santiago, Chile
Felipe Fernández
1   Departamento de Traumatología y Ortopedia, Hospital Dr. Sotero del Rio, Clinica MEDS, Santiago, Chile
3   Departamento de Traumatología y Ortopedia, Universidad de Chile, Santiago, Chile
› Author Affiliations


Objective To describe and evaluate the results of the treatment of femoroacetabular impingement (FAI) with the unassisted mini-open approach in a defined population.

Materials and Methods We performed a prospective clinical and functional assessment of fifty young patients with CAM-type FAI, with very low sports demand, treated by the unassisted mini-open approach. We included patients older than 18 years of age, with a diagnosis of symptomatic FAI, complete radiologic study, and positive lidocaine test. We excluded patients with previous hip pathology. We compared the pre- and postoperative modified Harris Hip Score (MHHS) (through the Wilcoxon test) and the pre- and postoperative scores on the Visual Analogue Scale (VAS) (through the Friedman analysis of variance [ANOVA] test). significance was established as p < 0.05. In total, 50 patients met the described inclusion criteria: 33 male and 17 female subjects.

Results The average age was of 36.8 ±  6.5 years. The average alfa angle was of 62.6° ±  5.6°. All patients had grade-1 Tonnis index osteoarthritis. In total, 39 patients had level 3 of activity (according to the Tegner scale). The mean follow-up was of 27.3 ±  6.2 (minimum of 12) months. The score on the MHHS improved from a preoperative median of 60.5 (range: 30.8–84.7) points to a postoperative median of 96.8 (range: 91.3–100) points (p < 0.001). All patients presented a significant decrease in pain, with a median VAS score of 0 at 1 year of follow-up.

Conclusions This technique presents good clinical and functional outcomes in patients with low sports demand. There is a lack of studies showing the advantages and limitations of the mini-open approach concerning the resection of larger bumps or in other locations.

Level of Evidence: 4.

Publication History

Received: 28 August 2021

Accepted: 28 September 2022

Article published online:
18 May 2023

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