Simply put science is seeking of truth or knowledge based on experiments or research. If knowledge is not based on research and just out of personal observation then it becomes a matter of faith. In physiotherapy science “approaches” or techniques start with personal observations, theoretical considerations of that particular time and a therapist’s ingenuity. This is true for all the approaches in neurology starting from Knott & Voss’s PNF to Carr & Sheppard’s MRP. When these approaches were first written they were derived from cutting edge science of those days and in those times it was considered revolutionary.
For example, when Bobaths wrote their book on adult hemiplegia they departed from Brunstromm’s Ideas of recovery and treatment principles. (Bobath moved from a 6 stage recovery to 3 stage recovery process in stroke.)
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