Related Experiment Video
Updated: May 27, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
Published on: September 7, 2022
Making a case for anterior inferior iliac spine/subspine hip impingement: three representative case reports and
Christopher M Larson1, Bryan T Kelly, Rebecca M Stone
1Minnesota Orthopedic Sports Medicine Institute at Twin Cities Orthopedics, Edina, 55435, USA. chrislarson@tcomn.com
Abstract:
Femoroacetabular impingement is typically described as occurring due to a conflict between the femoral head-neck junction and acetabular rim. A prior case report described an open decompression of the anterior inferior iliac spine (AIIS) due to impingement against the proximal femur. AIIS impingement may be developmental or the result of a prior AIIS avulsion or pelvic osteotomy. We describe 3 representative cases with minimum 1-year follow-up treated with an arthroscopic AIIS decompression.

