Physiotherapy is a key factor in effecting decisive positive changes i
n the course of ankylosing spondylitis. Most important is the accurate
assessment of functional deficits of spine and joints because it prov
es an essential basis for all physiotherapeutic strategies. This appli
es especially for group exercises where the individual patient usually
can only be dealt with summarily. Functional capacity of lumbar spine
flexion and, more important, lumbar extension - assessed loaded or un
loaded in order to evaluate whether loaded flexion/extension can possi
bly correct unloaded - will lead to graduation of patients deficits. P
athomechanics and pathodynamics of the course of ankylosing spondyliti
s and functional graduation as prerequisite for a patient orientated p
hysiotherapy are presented. Some exercises for individual patients as
well as group therapy are described for demonstration of these conside
rations.