Forefoot valgus is when the forefoot is everted while the calcaneus and subtalar joint
are in neutral.
, the TCA does not correlate to the FTA when the Larsen grade of the subtalar joint
is 4 or more.
Physical examination of the left ankle revealed limited inversion, a rigid subtalar joint
, and weakness of the left peroneal muscles.
Supination causes the outside edge of the bottom of your foot to bear the majority of the load, and can be thought of as the "locking" of the subtalar joint
in preparation for a strong pushoff.
The subtalar joint
's primary motion is inversion and eversion of the rearfoot in the frontal plane.
It has been found that the types of subtalar joint
facets are different in many races.
Magnetic resonance imaging (MRI) of the left ankle revealed a vertical crack in the talar body extending from the center of the talar dome to the subtalar joint
and a lateral talar body fragment with low signal intensity on both T1-weighted and short T1 inversion recovery images suggestive of osteonecrosis (Figures 2(a) and 2(b)).
Mosca  found that making an osteotomy from proximallateral to distal-medial could protect the two facets of the subtalar joint
. Although there seems to be some controversy about how to improve the Evans procedure, surgeons have realized the importance of the Evans osteotomy passing between the anterior and middle calcaneal facets [14, 22].
The subtalar joint
(talocalcaneal jt.) is a major shock-absorbing joint, because in coordination with the intertarsal joints it determines the distribution of forces upon the skeleton and soft tissues of the foot.
Her medial soleus and gastrocnemius on the right are palpably tighter than on the left; her subtalar joint
is slightly inverted in its resting position and does not evert as it should during weightbearing plie but has full range of motion to inversion on her releve.
Limited studies determine kinematics and kinetics in all three planes, where motions of the ankle joint and the subtalar joint
actually occur .
Will the motion attained following total ankle arthroplasty protect the ipsilateral subtalar joint
complex from arthritis?