1. Hip Arthroscopy for Removal of an Acetabular Rim–Based Osteoid Osteoma and Concomitant Femoroacetabular Impingement Correction 
Jacques A. Denker, D.O., Hollis M. Fritts, M.D., Rebecca M. Stone, M.S., A.T.C., Christopher M. Larson, M.D. 
Arthroscopy Techniques 
Volume 5, Issue 6, Pages e1215-e1220 (December 2016)
DOI: /j.eats
Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

2. Fig 1
Preoperative and postoperative radiographic images of left hip: anteroposterior (A, B) and 45° modified Dunn (C, D) views. (A, C) Preoperative radiographic images showing femoral cam pathology (yellow arrows) and rim-based acetabular osteoid osteoma (white arrows). (B, D) Postoperative radiographic images showing completed femoral osteoplasty (yellow arrows) and rim-based acetabular osteoid osteoma resection (white arrows).
Arthroscopy Techniques 2016 5, e1215-e1220DOI: ( /j.eats )
Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

3. Fig 2
Identification of rim-based acetabular osteoid osteoma in left hip. (A) Coronal computed tomography scan showing the acetabular-based lesion and associated nidus (arrows). (B) Coronal T2-weighted magnetic resonance image of the same hip showing increased signal intensity in the acetabular rim (arrows) consistent with an osteoid osteoma. The nidus is difficult to localize because of perilesional edema.
Arthroscopy Techniques 2016 5, e1215-e1220DOI: ( /j.eats )
Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

4. Fig 3
Key steps of osteoid osteoma localization and removal (viewing from anterolateral portal with 70° arthroscope, with instrumentation through midanterior portal). (A) The lesion is localized (arrows) on the left acetabular rim. (B) Hyperemic punctate tissue typical of osteoid osteoma. The arrows indicate the acetabular rim–based lesion after partial exposure. (C) Thermal ablation after curette resection (arrows). (D) Complete resection of the lesion (arrows).
Arthroscopy Techniques 2016 5, e1215-e1220DOI: ( /j.eats )
Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

5. Fig 4
Key steps in addressing concomitant labral and femoral cam pathology. (A) Completed left labral repair (arrows) viewed through the midanterior portal with a 70° arthroscope. (B) Left femoral resection (arrows) guided by both intraoperative dynamic analysis and fluoroscopic evaluation (viewing from midanterior portal with 70° arthroscope and working through anterolateral portal).
Arthroscopy Techniques 2016 5, e1215-e1220DOI: ( /j.eats )
Copyright © 2016 Arthroscopy Association of North America Terms and Conditions