Sinus tarsi syndrome is the clinical disorder of pain and tderness in the sinus tarsi, which is the lateral side of the foot, betwe the ankle and the heel.
Sinus tarsi syndrome can have a variety of causes. The most common is an inversion (rolling out) ankle sprain, which makes up 70-80% of cases, followed by pronation of the foot, which is responsible for about 20-30% of cases.

In the case of posterior tibial tdon dysfunction causing flatfloot, sinus tarsi can also develop due to the disruption in the tire structure of the foot.
Anterior Ankle Impingement
Sinus tarsi syndrome is characterized by pain, tderness, and instability/aggravation of the pain wh walking on unev surfaces or during weight-bearing activity. The pain will be also aggravated by inversion (turning in) and eversion (turning out). Loosess of the ankle and foot joints can also occur.
There is also oft the presce of ligamt tears, arthrofibrosis, ganglion cysts, or degeration of the joints. Occasionally, peroneal spasms, valgus hindfoot, and limited varus motion can also be prest.
Other diagnostic tests include: bone scans, CT scans, and MRI evaluation. Doctors may inject local anesthetic to localize the problem to the sinus tarsi.
Charcot Marie Tooth Disease
Ankle arthroscopy may also be used to locate damaged tissue. Diagnosis is oft a process of elimination as sinus tarsi syndrome is rarely a definitive disorder.
Surgical treatmts are very rare and reserved for highly resistant cases. Surgery can be op (via an incision) or closed (via arthroscopy).
In cases of flatfoot, sinus tarsi syndrome is complicated by the collapse of the arches. In these cases, surgery includes debridemt (cleaning out) of the sinus tarsi and possible reconstruction of the foot. Surgery can also include debridemt of bone spurs as well.
Posterior Tibial Tendon Insufficiency (ptti)
Sinus tarsi syndrome can be misdiagnosed as a chronic ankle sprain. Untreated sinus tarsi syndrome can develop into chronic ankle pain and disability.
Sinus tarsi syndrome was first studied by Dr. Dis O'Connor in 1957. O'Connor claimed conservative treatmt was ineffective and surgery was the only effective option, describing a surgery in which the surgeon resects the superficial ligamtous floor and cleans out the fat pad. O'Connor claimed all 14 patits this surgery was performed on reported relief of their symptoms. While there is not a lot of conssus in the medical community (and the disorder continues to be understudied), other treatmt options, including conservative treatmts, have be to prov to be viable in the time since.
Since its first description, the causes of the syndrome have also be in dispute. In 1960, Brown proposed that herniation caused the pain and discomfort associated with the syndrome. In 1981, Taillard et al describes ligamt tearing as a cause. Further on, Schwarzbach et al described scarring around the veins to be the source of pain.What is sinus tarsi syndrome? I mean it sounds like a complicated name but it’s not really a complicated condition. The “sinus” means basically like a tube or a passageway and “tarsi” refers to the rear foot bones in your foot. So the tarsal bones are the big bone in your rear foot like the calcaneus heel bone or the talus that sits on top of the heel bone and sits underneath your tibia and your ankle joint. Those are the greater tarsal bones.
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Osteochondral Lesion Of Talus, Ankle Impingement, And Sinus Tarsi Syndrome
Sinus Tarsi is actually a tunnel that runs between the talus and the heel bone. Your subtalar joint, the joint under which is important and runs under the neck of the talus in your subtalar joint and it’s a little cavity that has some fat, it has some nerve endings and it has some fluid that lubricates the joint.
But sometimes you can get inflammation on the tissue that lines that joint and when you get inflammation of the lining of that joint and it hurts, that’s sinus tarsi syndrome.
There’s couple ways you can get it. When you supinate and you pronate your foot, your foot is moving back and forth landing on uneven surfaces, it pronates and supinates a lot harder. When you run on a regular ground you still pronate and supinate all the time.
The Os Trigonum Syndrome
Everyone pronates. Everyday pronates. It’s when and how much that actually matters. If you use your subtalar joint, you pronate. You pronate and supinate to do a couple of things like you pronate to absorb forces or when your foot hits a ground your forefoot down. You pronate in order to absorb impact. If it’s more flexible, well then you supinate and you lock everything and your foot push off
If you run on really uneven surfaces like your land on rocks and roots and all that sort of stuff well you’re pronating and supinating aggressively and sometimes you pronate so hard that you basically pinch the synovial tissue or the lining of that joint that makes the synovial fluid on the inside of your subtalar joint and it becomes inflamed.

When it becomes inflamed, it swells. When it swells it actually gets pinched more and it is a soft squishy tissue that has lots of nerve endings so when it becomes inflamed and swollen and you’re pronating when you’re running it hurts and now that it’s swollen and is getting pinched between the heel bone in the talus, every time you take a step.
Talus Bone: Normal Anatomy, Anatomical Variations And Clinical Correlations
So then you’re just walking on it and it hurts and so it can build up over time. It hurts a little bit because you aggravated it too much and then it swells more than it hurts not only when you’re running but it hurts when you’re walking too and then next thing it hurts if you even wiggle your foot around or you’re sitting in some business meeting.
The best case scenario is it calms down and you can keep running with no hassle at all. Of course hopefully very quickly.
Worst case scenario is that you continue to aggravate it and irritate it and you get basically chronic inflammation, chronic swelling within the sinus tarsi that won’t calm down.
Talus Sinus Tarsi Syndrome With Long Needle
When that happens a doctor may recommend a surgery that we call a sinus tarsi evacuation where we basically go in, we just cut out all the tissue in there that’s inflamed and then it calms down. I haven’t done that in a long time because I wouldn’t want to do that on a runner because you can injure the talar carpal ligament. When you do that, I don’t think that’s a great approach.

We always try to figure out like what is best for you as an individual, as a runner, what’s going to help you the most and get you back to run as quickly as possible and not screw up your possibility of running for the rest of your life.
In sinus tarsi syndrome, your worst case scenario is that you end up in surgery. But that is unlikely first of all. So when you’re thinking about running with this, you have to think about it.
Morton's Neuroma Archives
You have to decide like this case worst case scenario given your particular circumstances with you as a runner to decide whether or not it is okay for you to keep training right now, whether you should do something to calm it down really quickly and whether or not it’s safe for you to do the next event, all dependent upon your goals and how far away that event is.
First of all, if you see a doctor that say just have to stop running, it’s bad for your feet or it’s hard on your joints, go see another doctor that’s the first thing. But it can be misdiagnosed a lot of times if you sprain your ankle and you’ve already had this problem. They’ll say well it’s just an ankle sprain because the ligament that’s most often sprained in an ankle sprain is called the ATFL or the anterior talofibular ligament and the ATFL ligament runs across and within the sinus tarsi.
Another way you could be misdiagnosed with sinus tarsi syndrome when it’s actually something else is if you have a crack in the bone, the talus bone as we refer to as the lateral process. So a lot of doctors do not really know that much about this thing and I actually did the largest study ever on lateral process fracture of the talus and I won an award from the American College of Foot and Ankle Surgery for that study and we actually found that those are ten times more common than was previously reported in the medical literature. It was way more common that what I was taught in medical school and we did this huge study to figure that out.
Plantar Fibromatosis Aka Ledderhose Disease
If you sprained her ankle, you do the right stuff you, get better and you still have this continuing aching pain and your doctor says it’s just the residual effects of having a sprained ankle but you actually have a crack in the bone, it’s going to get better. So you have to make sure you do not have one of those.
The other thing is sometimes you have peroneal tendons that are irritated. They’re a little bit further away from the sinus tarsi but I have seen
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