Quantitative Study of the Interosseous Tuberosity of the Radius

The interosseous tuberosity of the radius (ITR) has recently been described on radiographs, computed tomography (CT) scans, and in fresh cadavers (Rougereau et al., 2020). However, its morphology on dry bones remains insufficiently documented. An investigation of dry radii was undertaken to complement existing findings.

The research was divided into three components: osteometric, cadaveric, and radiological. In the osteometric component, 1,125 European radii were evaluated using digital Vernier calipers. Six embalmed forearms were dissected in the cadaveric component. And in the radiological component, four dry radii were scanned using Neoatom Alpha CT scanner.

The ITR was present in 100% of the analysed bones, with distinct anterior and posterior parts. The mean length of the anterior part was 51.98 mm (22.4% of the bone length), whereas the posterior part was 45.58 mm (19.6%). In the dissected forearms, the ITR was also observed in all cases. The origin of the flexor pollicis longus was identified on the anterior part, and the abductor pollicis longus and extensor pollicis brevis on the posterior part. Attachment of the interosseous membrane of the forearm was provided by both parts.

The ITR was confirmed to be constantly present on bone specimens, and new morphometric data have been provided from a large Central European sample. These findings help lay the groundwork for further research into the clinical relevance of this structure.