I have found repeatedly in the clinic over the past 10 years that perhaps 90% of my client with Achilles issues are related in part to soleus eccentric function. Whilst there is considerable work done that address hip joint stability, position and rotation, as well as foot factors, I still find the biggest problem is soleus.
Luckily training this with both a slightly flexed and extended knee gives very quick and long-lasting results. I am however totally at a loss as to why so many physios and even worse gym instructors still advocate straight knee calf raises for strengthening this problem. It seems to feed on the existing issues and only makes the long term prognosis inevitably worse.
Does anyone else have some thoughts on this?