An Anatomic Evaluation of Arthroscopic Access to the Radial Head

Purpose To determine the area of the radial head accessible for visualization and screw placement from the standard anteromedial and anterolateral portals used in elbow arthroscopy. Methods Five cadaveric elbows were arthroscopically evaluated using standard anteromedial and anterolateral portals. Markers (pins) were placed into the accessible portions of the radial head at maximal pronation and supination. Specimens were then evaluated by computed tomography, and the arc of the radial head accessible from each portal was determined. Results A continuous 220.04° ± 37.58° arc of the radial head was accessible from the combination of the anterolateral and anteromedial portals. From the anteromedial portal, the arc obtained measured 147.96° ± 21.81°, and from the anterolateral portal, the arc obtained measured 156.02° ± 33.32°. Using the radial styloid as a marker for 0°, the mean total arc ranged from 92.3° ± 34.06° dorsal to 127.74° ± 23.65° volar relative to the radial styloid. Conclusions Standard anteromedial and anterolateral portals used for elbow arthroscopy allow access to an average 220° area of the radial head. Clinical Relevance This study defines the area of the radial head that can be contacted using commonly used, safe, and simple portals.