Scapholunate ligament tear is most frequently encountered in the aftermath of trauma in supination and extension of the wrist. It generates chronic instability, leading to osteoarthritis. It may be associated with fracture of the distal epiphysis of the radius or of the scaphoid. These lesions are often difficult to diagnose, especially in early stages. Treatment of chronic scapholunate ligament lesions before onset of osteoarthritis is a challenge for the surgeon. To date, recommendations are for open reconstruction or repair, which can improve pain and grip strength, but very often at the cost of wrist stiffness. The advent of arthroscopy has completely changed the understanding and treatment of these lesions. The present review focuses on recent contributions to the anatomy of the scapholunate complex and the anatomopathology of these dissociations, and explores classical treatments and the emerging role of arthroscopy. We shall seek to answer five questions: (1) What are the anatomical bases of the scapholunate complex, (2) What is the initial clinical and paraclinical work-up for scapholunate dissociations, and how are they to be classified, (3) What are the classical treatments for scapholunate dissociation, (4) What are the technical principles and results of arthroscopic treatment, (5) What are the limits and perspectives of arthroscopic treatment?