728 Histomorphology Of the Subregions of The Scapholunate Interosseous Ligament and Its Enthesis

Abstract Introduction The scapholunate interosseous ligament (SLIL) is commonly ruptured following a fall onto the outstretched hand. This has three subregions: dorsal, proximal, and volar. SLIL enthesis, specialised region where this attaches to scaphoid lunate, not previously been studied despite its important mechanical function in wrist joint biomechanics. study therefore aims compare histomorphological differences between subregions, including at their entheses, inform subregion prioritisation during surgical reconstruction. Method Twelve fresh-frozen human cadaveric wrists were dissected gross dimensions of subregions measured. Subregions histologically processed for analysis, quantification enthesis calcified fibrocartilage (CF) area. Results From measurements, dorsal was thickest (dorsal=3.04 ± 0.26mm, volar=1.69 0.08mm, proximal=1.51 0.06mm). volar had fibrocartilaginous entheses while proximal attached articular cartilage. significantly more CF than subregion. Conclusions greatest area, which consistent with biomechanical force subjected These results confirm that strongest subregion, suggesting implications graft incorporation