Interesting question Mohamed:
I am approaching my response not on you personally or your expertise but simply on existing EBM and my humble opinion
1. If by extensors you mean fibularis tertious, anterior tibial and extensor hallucis and digitorum, I cannot agree with your hypothetical question.
I maintain, in opposition, that more research is dedicated to the flexors because in closed chain they are the prime movers and prime compensators
2. I think there is too much emphasis placed on the compensators and not the prime movers of the lower extremity. Those in EBM are focusing on symptomatic areas of complaint and not the underpinning biomechanics that produce them
3. R U referring to knee, ankle joint, subtalar joint, MTJ, 1st ray or all in your question?
4. My sense is that there has been a dearth of quality high level peer reviewed research in the last decade or two. I maintain this is because we do not have a quality starting place for selection of cohorts. That makes your question, no matter what, somewhat moot
5. Please take into account that I have bias regarding this topic as I am the creator of functional foot typing, a new starting platform for lower extremity biomedical engineering and gait analysis
Joyous 2018
Good question. In general Opposing groups must switch off as 1 side (opposition) contracts - interplay is essential for stability. This switching likely is subtle as knee elevation and toe rise varies by person when establishing stride and hamstring resting length is quite critical. Hyper tonus in any combination will limit recovery in stride length and possibly balance recovery upon perturbation. Ligament condition also has bearing.
Any analysis should establish full muscle relaxed length first, - difficult as RSI ( overuse injury ) has likely altered some values.
I think the extensors muscles in LE are more involved in LE advancement due knee extension and body forward propulsion to achieve ambulation goals. in general they are more active either in concentric or eccentric moods during gait which make them good subjects to study
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