Biodex systems 3 and 4 use Isomap as a type of report. In essence an isomap looks at torque and position like an ordinary MAP curve but it then adds speed (3 speeds are tested and shown) to the equation which produces a coloured 'map' showing deficits in strength or speed production both related to angle. In the deficit map red areas show problems whilst blue areas are OK.
Irrespective of the joint/muscle system involved there are some basic principles which form a basis for interpretation. These are discussed in a lot of studies but are best described in Sapega (1990).