Functional combination of two anatomically separate joints - the talonavicular and calcaneocuboid joint.
Traditional orientation of joint axes that where assumed to function as hinge joints and first described by Manter (1941):
Longitudinal – 15 degrees from the transverse plane and 9 degrees from the sagittal plane
Oblique – 52 degrees from the transverse plane and 57 degrees from the sagittal plane (a wide variation is noted clinically in the movements that are thought to represent this axis)
The motion about the midtarsal joints are much more complex that this . However, clinically and for pedagogical reasons, it can be useful to consider they do exist for observation and teaching of motion of the forefoot on the rearfoot about the midtarsal joint .
Nester’s axis work https://www.facebook.com/video.php?v=939520426145201
Range of motion at the midtarsal joint is dependent on the subtalar joint – a pronated subtalar joint increases the range and a supinated subtalar joint decreases the range.