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I have strapped a small pad of high density poron over the cuboid,
There is no swelling and no difference that I can feel between the left and right feet in the cuboid area. The tenderness is very localised. Feet are mildly pronated (and he runs wearing a basic orthosis with a 3deg medial rearfoot wedge). Ankle dorsiflexion is good with knee bent but limited when straight. End of range dorsiflexion brings on the cuboid pain slightly but no other foot movements provoke it. First MPJ feels good weight-bearing and non, although heavy medial IPJ callus suggests some issue there.
Could be lateral column compression syndrome and so the plantar cuboid pad is a good start - but just to be sure - you did mean you put it under the cuboid (plantar) and not over i.e. on the dorsal aspect didn't you?
For more on compression syndromes go here:
But really we need more infor: For instance where exactly
is the pain? What tissue do you suspect is painful? When you say the pain can be elicited by end range dorsiflexion do you mean purely dorsiflexion or is this end range pronation pushing manually on sub 4th 5th MPJ. Where exactly is the pain during this manoeuvre? What do you see the foot doing in gait, what are the biometrics and anatomical variations? Perhaps you can better describe the foot in Rootian terms if that is what you are familiar with e.g. uncompensated rearfoot varus, compensated forefoot varus, forefoot supinatus and inverted STN etc.
There are quite a few soft tissues in the cuboid area, and may be excessively stressed by a multitude of biomechanical aetiologies e.g. there could be peroneus longus pain caused by excessive pronation moments or excessive supination moments, there could be compression syndrome caused by STJ pronation and forefoot abduction moments or a compliant lateral column with a valgus forefoot and a supinating STJ etc etc.
Look here for more evaluation of lateral column pain: http://www.podiatrytoday.com/article/3691
Regards Dave Smith