Musculoskeletal

The cyclic compression and release of the articular cartilage during walking certainly helps in maintaining continuous circulation of synovial fluid into and out of cartilage. Compression from weight bearing squeezes fluid out of the cartilage and into the synovial cavity and fresh fluid enters the cartilage from that cavity when the weight is released. Cyclic exchanges of healthy synovial fluid are among the benefits of exercise.

The question of medial vs lateral rotation actions in the medial thigh compartment is a long-standing issue that doesn't seem to want to go away, even though it really was resolved many years ago. The answer is tied very closely to the age of the individual and the accompanying maturation of the femoral head and neck. In children (age definition vague), the femur is quite vertical relative to the pelvis due to the femoral neck being quite short and vertical when immature.