Patterns of ‘twist’ in the right Achilles tendon, posterior view. Type 1 (least twist): with only Sol attached to the deep layer of the calcaneal tuberosity (calcaneal side). Type II (moderate twist): with LG and Sol attached to the deep layer of the calcaneal tuberosity. Type III (extreme twist): with only LG attached to the deep layer of the calcaneal tuberosity LG, fibers from the lateral head of the gastrocnemius; MG, fibers from the medial head of the gastrocnemius; Sol, fibers from the soleus muscle. Blue, fibers from the lateral head of the gastrocnemius; red, fibers from the medial head of the gastrocnemius; yellow, fibers from the soleus muscle. L, lateral; M, medial.