Fig. 1
From: Role of ultrasound and inflammatory factors in the management of pediatric hip joint effusion
The sonographic measurements of hip effusion in anterior recess: (A) Longitudinal diameter and thickness of hip effusion. (B) Transverse diameter of anterior recess. The anterior recess volume was measured with these three dimensions. (C) Capsule thickness at the midpoint of the anterior recess and synovial thickness at the maximal point. Synovial thickening in reactive arthritis is obvious. L: Labrum, S: Synovium