Fig 1.

Dry diagnostic arthroscopy of anterior compartment. (A) Radiocapitellar articulation viewed from anteromedial portal. The articular surfaces are coated in synovial fluid. Light reflects more readily at the air–synovial fluid interface to give a clear, vibrant image. (B) Lateral capsule and radiocapitellar joint viewed from anteromedial portal. Air distension expands the working space and tensions the capsule, which can be seen clearly. Bubbles on the surface of the synovial fluid can be seen from the air distension. (C) Medial capsule and coronoid process viewed from anterolateral portal with elbow flexed. The hammock-like anatomy of the capsule is displayed, as is the bony detail of the coronoid process and trochlea. (D) Panoramic view of anteromedial aspect of joint with elbow extended. The vascular markings of the capsule are seen with clarity that cannot be achieved when using air distension.