Does it matter which angular representation is used?
Under many clinical circumstances, gait/ motion information is nearly unhelpful, and such mathematical delicacies are ignored completely. I don’t dispute the academic validity of this type of argument, and perhaps its mathematical fascination. Detailed discussion of these concepts would be important for the purposes of computer simulations and calculations of movements, say in VR applications or other computerised processes, where dealing with the errors is not only a calculation but a mathematical flirtation. However, when trying to understand the gait recovery of a 57 year old stroke patient and decide where to focus the physiotherapy efforts, all these seem like “star trek”. I would like to encourage contributions from all colleagues who have the pleasure of having to deal with the pragmatic world of health care. At least from a clinical point of view, it is important to stimulate discussions about gait data analysis that aims to enhance patient care, or at least make it clear that
