The RSI syndrome in historical perspective.

The pain syndrome repetition strain injury (RSI) has been variously interpreted as a psychogenic disorder, an overuse injury of upper limb musculature, and a state of peripheral neural irritability. A review of the history of work-related upper limb disorders was undertaken to ascertain whether RSI is a new medical phenomenon or an older syndrome in a new guise. In the mid-nineteenth century these disorders were known as either craft palsies or writer's and other occupational cramps. Not withstanding clinical evidence suggesting that most were associated with peripheral neural or muscular dysfunction, a body of influential medical opinion considered them all to be disorders of the central nervous system, appropriately termed the occupation(al) neuroses. During the twentieth century, as discrete occupational upper limb nerve lesions were delineated and the spasmodic form of writer's cramp was recognized as a torsion dystonia, a unifying concept of aetiology for the occupational neuroses of the nineteenth century became untenable. The RSI syndrome of the 1980s can be identified from early case descriptions of both scrivener's palsy and the neuralgic variety of writer's cramp. Contemporary hypotheses proposed to explain RSI are remarkably similar to those proposed for the occupation(al) neuroses.