Peroneus brevis is a more effective evertor than peroneus longus

"A primary function of the peroneus longus and peroneus brevis is to provide the eversion moment necessary to balance the opposing inversion moments. "
The peronei have to be rehabilitated when injured, and they have to be strong to effectively control that rear and midfoot and work in a balance fashion. This is not a simple task and this will take some specific focused efforts, in our experience. On example we would strongly suggest would be to put far more focus on loaded weight bearing peroneal challenges in various heel heights rather that waste time with non-weight bearing band/theraloop work, it just cannot replicate the loaded rear/mid/forefoot.

Foot and Ankle. 2004 Apr;25(4):242-6.Peroneus brevis is a more effective evertor than peroneus longus.Otis JC1, Deland JT, Lee S, Gordon J.

https://www.ncbi.nlm.nih.gov/pubmed/15132932

Ankle inversion sprain ? or off-loading photo ?

How we do one thing, is how we do all things.

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I was sitting having my morning coffee earlier than normal this morning, which left me time to ponder some things.
Look at this picture, is this not a magnification of the "cross over gait" x100 ? Thus, is that planted foot not inverted ? Yes, it has to be, to a degree, a high degree. There is a reason why soccer players have a great affinity for ankle sprains.
When we have a narrow based gait, we are most likely going to strike more laterally on the foot, more supinated, if you will. If you widen step width, less inversion, less lateral forces (typically) and less supination (typically) compared to a narrow based gait.
If we descend stairs with our feet in a more narrow based gait, we are not only going to be inverted more, but striking at the ball of the foot, thus, more on the lateral foot tripod. This is the typical inversion sprain injury position.
When we jump, we should be trying to land with our feet more abducted, certainly not narrow based, because if we are too narrow we are at more risk for the same lateral forefoot landing and thus ankle inversion event. Just like descending stairs.

We see plenty of ankle inversion events. Why?
Because most people do not have enough hip abduction or peroneal skill, strength, endurance and they are unaware of their weak gait patterns or their ankle spatial awareness. Many have lazy narrow based gaits and insufficient proprioceptive awareness. And, they carry these things over into running, walking, jump landing (ie. volleyball, basketball, etc), and descending stairs, just to name a few.

How we do one thing, is how we do all things (mostly).

Rickie Lovell As he struck the ball it would been everted. The momentum of the follow through will have off loaded the everted foot as the energy moves in a similar line to that of the ball. It is extremely rare for a footballer to get a sprain from this, I certainly didn't see over several years working in professional football.
On a side note, find some footage of David Beckham taking free kicks - the mechanics are astounding!

The Gait Guys possibly everted, but no guarantee.It still looks pretty inverted to me.But we see your point, and is a real good one, real good. Super good. We will check our the bender-man thanks for chiming in with such great insight !

The Gait Guys yes, the momentum of the leg kicking across the body would externally spin the stance leg. The picture is likely showing the offloading phase, not the loadin

Rickie Lovell The benefits of being a Brit that used to play!

Trying again here. VIDEO CASE: Is this lateral compartment weakness ?

Quite simply, there are too many people playing doctor out there that do not have the ability to examine their clients appropriately. Here is another case of just that.
It is clear that this client has left lateral compartment deficits. Or is it too much medial compartment tone ? Your screens and loading tests will not likely show you this specifically, this client may merely present, as they did in this case of left frontal plane hip-pelvis drift and a right cross over step. If you have been with us for awhile, you know these 2 match up when it comes to locomotion. But one must solve the "Why" for the "how" to be accurate (how to fix it).
But, if you are looking for weakness, you will find it here, yes, peronei and lateral gastroc are weak. But is it inhibition or neurologic or frank weakness ? It is because of heightened medial compartment tone ? It could be, thus making one think of possible centrally mediated processes.
And, is the ankle the source or the frontal plane drift (glute weakness) the source ? Cart or the horse ? Chicken or the egg ? You have to examine your clients, on and off their feet, shoes off, socks off (yes, i took the socks off afterwards). Screens are not enough if you are trying to solve problems. Fixing how your client's improper loading is not a fix always, it could merely be teaching a compensation over a compensation to a problem. Be smarter than the rest, get the knowledge to examine your clients deeper , and more specific, function. Then, how they are moving, and the movements that you see that you do not like, will make more sense.
in this case, if you do not address the foot and the hip abductors and pelvis stabilizers, you lose, and so does your client as you build more strength into their asymmetry . . . . eventually leading, possibly, to complaints.