Value of oxyneurography, based on near infrared spectroscopy, in the diagnosis of carpal tunnel syndrome in comparison to provocative clinical diagnostic tests and nerve conduction studies

Near Infrared (NIR) is a form of electromagnetic radiation of the wavelength of 700-1000 nanometers. It is positioned within range of the infrared waves, between visible light and radio waves. Tissues absorb photons of NIR radiation with an aid of the molecules called chromophores that include haemoglobin (85-88%), myoglobin (10%) and oxidase of cytochrome C (2-5%) (Boushel and Piantadosi, 2000; Boushel et al., 2001). Oxidation state i.e. oxygenation of the chromophores changes the intensity of the absorbed light.

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