![]() ![]() Schamroth 1976Ģ010 – Pallares-Sanmartin et al used the interphalangeal depth ratio as the diagnostic standard and demonstrated that the Schamroth sign had a sensitivity of 77-87%, specificity of 90%, positive likelihood ratio of 8, and negative likelihood ratio of 0.2. Clubbing manifests with an abnormally wide and deep angle which extends more than half-way up the finger nails (arrow in Fig. ![]() This angle is normally minimal, virtually non-existent, and does not extend more than half-way up the nail bed (Fig. ![]() Schamroth angle: prominent distal angle between the ends of the nailsĪnother aspect of clubbing which becomes evident from this manoeuvre is the formation of a prominent distal angle between the ends of the nails.
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March 2023
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