The orthodromic motor inching test in the differential diagnosis of the increased distal motor latency of the median nerve – a pilot study

Carpal tunnel syndrome (CTS) is characterized by an increased distal motor latency (DML) of the median nerve. In this pilot study we investigated whether the orthodromic motor inching test may be useful in the distinction between an increased DML due to idiopathic CTS or CTS associated with demyelinating neuropathy. So far we included 46 controls without any symptoms of CTS and a normal DML according to our laboratory standards (