O'Brien et al. examined 11 cadaveric shoulders using arthroscopic in-situ visualization and histology to define the detailed anatomy of the inferior glenohumeral ligament. The central question: is this structure a single thickening, or something more complex? This paper established the IGHLC as a three-component structure with distinct gross and microscopic anatomy.
The 50% recurrence rate after posterior shoulder instability repair — cited in this paper. Existed partly because surgeons were treating the IGHL as a single anterior structure rather than a three-component complex responsible for both anterior and posterior stability.
This paper is foundational to how we think about capsular repair in shoulder instability. When you are in the OR addressing recurrent instability, restoring the entire IGHLC (anterior band, axillary pouch, and posterior band) is the goal. Not just reattaching the anterior capsule.
In the clinic, when you examine a patient with posterior instability at 90° abduction and internal rotation, you are testing the posterior band of the IGHLC. Understanding the hammock mechanism explains why arm position during provocative testing matters and which component is under stress.
The V-shaped humeral insertion variant (45% of shoulders) places the axillary pouch apex more distally on the humerus. A detail that matters when tensioning a capsular shift, because over-tightening can distort normal anatomy differently depending on insertion type.
O'Brien et al. examined 11 cadaveric shoulders using arthroscopic in-situ visualization and histology to define the detailed anatomy of the inferior glenohumeral ligament. The central question: is this structure a single thickening, or something more complex? This paper established the IGHLC as a three-component structure with distinct gross and microscopic anatomy.
The 50% recurrence rate after posterior shoulder instability repair — cited in this paper. Existed partly because surgeons were treating the IGHL as a single anterior structure rather than a three-component complex responsible for both anterior and posterior stability.
This paper is foundational to how we think about capsular repair in shoulder instability. When you are in the OR addressing recurrent instability, restoring the entire IGHLC (anterior band, axillary pouch, and posterior band) is the goal. Not just reattaching the anterior capsule.
In the clinic, when you examine a patient with posterior instability at 90° abduction and internal rotation, you are testing the posterior band of the IGHLC. Understanding the hammock mechanism explains why arm position during provocative testing matters and which component is under stress.
The V-shaped humeral insertion variant (45% of shoulders) places the axillary pouch apex more distally on the humerus. A detail that matters when tensioning a capsular shift, because over-tightening can distort normal anatomy differently depending on insertion type.