The line of fracture is generally irregularly transverse, or it may be slightly oblique from above downwards and forwards, so that the proximal fragment passes forward towards the patella, while the distal is rotated backward on its transverse axis by the gastrocnemius muscle.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition."
Alexander Miles Alexis Thomson
Then she raised one of them, and her fingers explored the common tendon of the soleus and gastrocnemius.
"A Crooked Mile"
Oliver Onions
Of the lower leg: The tibialis anticus on the front side, exterior to the tibia, and the gastrocnemius, the large muscle in the calf of the leg.
"Physiology and Hygiene for Secondary Schools"
Francis M. Walters, A.M.