What is a general term applied to a variety of overuse leg conditions that seasonally plague many athletes? tibial periostitis compartment syndrome medial tibial stress syndrome exertional syndrome?

I believe the  term is the Medial tibial stress syndrome.  The medial tibial stress syndrome or the Shin splints is an inflammation of the muscles, tendons, and bone tissue around the tibia, Pain typically occurs along the inner border of the tibia, where muscles attach to the bone, it is most common on the inside of the tibia.

Apes, since we evolved from apes we resemble them, with a 98% of DNA is the same