Table 1.

Eligibility criteria of the study.

Inclusion criteria

1) A mixed FAIS diagnosis defined as a motion‐related clinical disorder of the hip characterised by a triad of symptoms, clinical signs, and imaging findings. This condition represents symptomatic premature contact between the proximal femur and the acetabulum.

2) ICRS grade ≥ IIIB or III/IV according to Konan/Haddad classification defined as a senior MSK radiologist with more than 20 years of experience.

3) No response to nonsurgical treatment in the last four months.

4) Radiographic and 2.0‐Tesla MRI records; chondral lesion confirmed with standard x‐ray projections (posterolateral, axial and crossable) and by 2.0‐Tesla MRI.

5) Surgical indication and general condition compatible with hip arthroscopy.

6) Same surgical team, technique, anaesthetic protocol, and pain management.

7) Patients treated at MEDS clinic (Santiago, Chile).

Exclusion criteria

1) Osteoarthritis (primary radiological signs: joint space narrowing, subchondral sclerosis, subchondral cysts, osteophyte formation, and joint deformities; secondary radiological signs: subluxations and joint effusion).

2) Systemic disease.

3) Chondral lesion size more than 16 mm in diameter.

4) Time between confirmed diagnosis and treatment >6 months.

5) Chondral lesion caused by osteochondritis.

6) Hip instability (joint mobility outside of physiological passive hip range of motion).

7) Use of intra‐articular corticosteroids in the last six months.

8) Chronic treatment with oral corticosteroids.

9) Concomitant injuries such as dysplasia or previous surgery in the affected hip.

10) Rheumatic disease.

11) Diabetes mellitus.

12) Current or previous hemato‐oncologic disease.

13) Contraindication for filgrastim.

14) Inability to give informed consent.

Abbreviations: FAIS, femoroacetabular impingement syndrome; ICRS, body mass index; MRI, magnetic resonance images; MSK, musculoskeletal.