The posterior tibial artery is one of the main blood vessels supplying the lower leg and foot, running along the back of the calf before curving behind the inner ankle bone to feed the sole of the foot. You can feel its pulse just behind the bony bump on the inside of your ankle, and clinicians check that spot routinely to assess circulation in the leg. Despite being less talked about than the femoral or carotid arteries, the posterior tibial artery plays a central role in vascular diagnostics, wound healing, reconstructive surgery, and the management of peripheral arterial disease.
Where It Runs and What It Supplies
The posterior tibial artery branches off from the popliteal artery, which is the continuation of the main thigh artery behind the knee. It arises together with the fibular (peroneal) artery from a short common trunk called the tibioperoneal trunk. From there it travels downward between the deep calf muscles and the muscles of the posterior leg compartment, running roughly parallel to the shinbone but on the back side of the leg.1PubMed Central. Clinical features of a rare anatomical variation of the posterior tibial and fibular arteries
Along the way, it gives off muscular branches that feed the calf and smaller branches that nourish the tibia itself. The nutrient artery that enters the shinbone to supply its marrow typically arises from the posterior tibial artery, which is one reason surgeons pay close attention to it during fracture repair.2PubMed. Anatomic characterization of the tibial and fibular nutrient arteries in humans As it reaches the ankle, it passes through the tarsal tunnel, a fibrous channel behind the inner ankle bone, then divides into the medial and lateral plantar arteries that supply the sole of the foot.3PubMed Central. Anatomical study of the distal course of the posterior tibial artery: A cadaver study
The territory served by the posterior tibial artery and its branches includes the heel, the arch, and much of the plantar skin. Surgeons describe this territory in terms of “angiosomes,” which are three-dimensional blocks of tissue fed by a single source artery. The posterior tibial angiosome covers the medial ankle, the heel pad, and portions of the midfoot, while the dorsalis pedis artery (from the anterior tibial system) covers the top of the foot. This distinction turns out to matter when clinicians try to predict whether a wound on the sole of the foot will heal.
The Posterior Tibial Pulse and Why It Is Hard to Trust
Feeling for the posterior tibial pulse is one of the first things taught in a physical examination course. You press gently just behind and below the medial malleolus, the bony prominence on the inside of your ankle. If you can feel a steady throb, the artery is presumably open; if not, something may be blocking blood flow.
In practice, though, this simple test is surprisingly unreliable. A study evaluating pulse palpation found that experienced and less-experienced examiners alike struggled with the posterior tibial pulse. The sensitivity of feeling for it ranged from only about 33 to 60 percent depending on the examiner, meaning that a substantial fraction of present pulses were missed. At the same time, up to 20 percent of examinations produced false-positive results, where examiners reported a pulse in a limb with documented disease. Disease was diagnosed in over 10 percent of healthy limbs and missed in a similar proportion of symptomatic ones.4PubMed Central. Peripheral pulse palpation: an unreliable physical sign
The accuracy of palpation tracked closely with the actual systolic pressure inside the artery. When blood pressure was high and the pulse was bounding, examiners found it easily. When pressure was low or the artery was calcified and stiff, the feel of the pulse changed in ways that confused even skilled clinicians. The takeaway from this research is that pulse palpation is a useful screening gesture but should never be the sole basis for a diagnosis. Objective measurements like the ankle-brachial index or duplex ultrasound are needed to confirm what your fingertips think they found.5PubMed Central. Peripheral pulse palpation: an unreliable physical sign
How It Figures Into the Ankle-Brachial Index
The ankle-brachial index, commonly known as the ABI, is the standard screening tool for peripheral arterial disease. The concept is simple: measure the systolic blood pressure at the ankle and divide it by the systolic pressure in the arm. A healthy ratio is typically around 1.0 to 1.3. When arteries in the leg are narrowed or blocked, the ankle pressure drops, and the ratio falls below about 0.9.
What makes this relevant to the posterior tibial artery is that the ankle pressure reading usually comes from one of two spots: the posterior tibial artery or the dorsalis pedis artery on top of the foot. The choice of which reading to use actually changes the result. Some protocols use the higher of the two ankle pressures, following guidelines from the American Heart Association. Others use the lower ankle pressure, and still others average the two.6PubMed Central. The Relevance of Different Methods of Calculating the Ankle-Brachial Index
Research on patients admitted for cardiac evaluation found that different calculation methods yielded different ABIs and therefore different assessments of cardiovascular risk.7PubMed. Different calculations of ankle-brachial index and their impact on cardiovascular risk prediction If one of the two ankle arteries is diseased and the other is not, using the higher pressure will mask the problem; using the lower pressure will catch it. For someone with a healthy posterior tibial artery but a narrowed dorsalis pedis, the method matters a great deal. This sounds like a technical detail, but it has real consequences for whether you get flagged for further testing or told your circulation is fine.
Duplex Ultrasound and Flow Velocities
When the ABI suggests trouble or the clinical picture is unclear, duplex ultrasound is typically the next step. This combines a standard ultrasound image of the artery with Doppler analysis that shows how fast blood is moving and in what direction. In healthy legs, the posterior tibial artery produces a crisp, triphasic waveform, meaning the flow bounces forward, briefly reverses, then flows forward again with each heartbeat. As disease narrows the vessel, the waveform flattens and velocities change.8PubMed Central. Doppler ultrasonography of the lower extremity arteries: anatomy and scanning guidelines
A study comparing people with severe peripheral arterial disease to healthy controls found markedly lower blood flow velocities in the posterior tibial arteries of the diseased group. Peak systolic velocity averaged roughly 43 cm/s in the disease group versus about 74 cm/s in controls. The study was able to establish non-overlapping reference ranges, meaning there was a clear statistical separation between sick and healthy legs based on these velocity measurements.9PubMed. Characterization of tibial velocities by duplex ultrasound in severe peripheral arterial disease and controls Ultrasound has the advantage of being noninvasive, relatively cheap, and able to directly visualize plaque buildup inside the vessel wall.
Peripheral Arterial Disease and Diabetes
The posterior tibial artery is one of the arteries most commonly affected by peripheral arterial disease, particularly in people with diabetes. The pattern of disease in diabetic patients tends to be distinctive: rather than large plaques in the thigh arteries (the pattern more typical of smokers without diabetes), diabetic arterial disease often concentrates in the smaller arteries below the knee, including the posterior tibial, anterior tibial, and peroneal arteries.
Long-standing diabetes drives changes in these arteries that include calcification of the vessel wall, uniform narrowing of the lumen, and irregular short-range variations in the inner diameter. Research has found strong correlations between the duration of diabetes and the severity of these changes across the femoral, calf, and foot arteries.10PubMed. Calcifications, narrowing and rugosities of the leg arteries in diabetic patients The calcification itself does not necessarily narrow the artery, but it makes the vessel wall stiff and harder to treat with balloon angioplasty. It also artificially elevates ankle blood pressure readings, making the ABI unreliable in heavily calcified arteries because the cuff cannot compress the artery normally.
When the posterior tibial artery is completely occluded, the consequences depend on how well the other two below-knee arteries and collateral pathways compensate. In some people, the anterior tibial or peroneal artery can maintain enough blood flow to keep the foot viable. In others, the loss of the posterior tibial artery’s contribution leads to a condition sometimes called “desert foot,” where few or no named arteries deliver blood to the foot. An occluded posterior tibial artery has been identified as a predictor of major adverse limb events, including amputation, in patients with critical limb-threatening ischemia and tissue loss.11PubMed. Predictors of major adverse lower limb events in patients with tissue loss secondary to critical limb-threatening ischemia
Predicting Wound Healing With Angiosome-Based Testing
One of the more practical applications of understanding the posterior tibial artery’s territory is in predicting whether foot wounds, particularly diabetic foot ulcers, will heal. A technique called transcutaneous oxygen pressure measurement, or TcPO2, places a small electrode on the skin to measure how much oxygen is reaching the tissue. The idea is that wounds starved of oxygen will not heal, regardless of what other treatments are applied.
When TcPO2 is measured specifically over the posterior tibial angiosome (the area between the navicular bone and the inner ankle), it turns out to be a strong predictor for ulcers located on the midfoot and heel. One study found that TcPO2 in the posterior tibial zone yielded 100 percent sensitivity and 85 percent specificity for predicting whether ulcers in that region would heal.12PubMed. Analyses of transcutaneous oxygen pressure values stratified for foot angiosomes to predict diabetic foot ulcer healing The measurement on the top of the foot (dorsalis pedis angiosome) did not predict heel or arch ulcer healing as well, which makes anatomical sense since that skin is fed by a different arterial source. Matching the measurement location to the artery that actually supplies the wound zone gives clinicians more accurate information about whether to pursue aggressive revascularization before expecting a wound to close.
Endovascular Treatment Below the Knee
When peripheral arterial disease threatens the limb, restoring blood flow is the primary goal. For blockages in the posterior tibial and other below-knee arteries, treatment options broadly fall into two categories: open bypass surgery, where a graft is sewn around the blockage, and endovascular procedures, where a catheter is threaded into the artery to open it from the inside.
The most common endovascular approach is balloon angioplasty, which inflates a small balloon at the site of the blockage to push the plaque aside. Stenting, where a tiny metal scaffold is left behind to hold the artery open, is an alternative. A Cochrane systematic review comparing the two found that stenting achieved a higher immediate technical success rate at opening the vessel, but there was no clear difference in whether the artery stayed open at six months. Complication rates, amputation rates, and death rates were also similar between the two approaches.13Cochrane Database of Systematic Reviews. Percutaneous transluminal angioplasty versus stenting for infrapopliteal arterial lesions in chronic limb-threatening ischaemia However, a more recent analysis from a large vascular quality database found that stenting, after adjusting for patient differences, was associated with better limb-preservation outcomes over an average follow-up of about a year, despite higher periprocedural complications.14Annals of Vascular Surgery. Tibial Artery Stenting in the VQI Database
Drug-coated balloon angioplasty is another evolving option that delivers anti-proliferative medication directly to the artery wall during inflation, aiming to prevent the vessel from re-narrowing. Trials have included the posterior tibial artery alongside the anterior tibial and peroneal arteries, though results for this approach below the knee remain mixed and the evidence base is still developing.15European Journal of Vascular and Endovascular Surgery. Drug Coated Balloon Angioplasty vs. Standard Percutaneous Transluminal Angioplasty in Below the Knee Peripheral Arterial Disease: A Systematic Review and Meta-Analysis The small caliber of tibial arteries, often just two to three millimeters across, makes them technically challenging to treat, and the high prevalence of calcification in diabetic patients adds another layer of difficulty.
Reconstructive Surgery and Perforator Flaps
Beyond its role as a conduit for blood, the posterior tibial artery has become one of the most important arteries in reconstructive plastic surgery. The lower leg is a notoriously difficult area to cover when skin and soft tissue are lost to trauma, burns, or surgery, because there is very little loose tissue to work with. The shinbone sits just beneath the skin over most of its length, and wounds over the lower third of the leg are particularly prone to delayed healing and infection.
Surgeons have developed a family of “perforator flaps” based on small branches that pass from the posterior tibial artery through the muscle and out to the overlying skin. By identifying one of these perforating branches and rotating a paddle of skin and fat around it, the surgeon can swing nearby tissue to cover the wound without needing a free tissue transfer from a distant body part. In a large series of 106 such flaps performed in 100 patients, about 72 percent of the wounds were on the lower third of the leg and 10 percent were on the ankle, heel, or foot. The technique was described as providing reliable coverage.16PubMed. Lower limb reconstruction using the islanded posterior tibial artery perforator flap
A V-Y advancement design, where the flap is slid forward rather than rotated, has also been described for small to medium defects. This approach works for wounds that are close to a perforator and do not require the flap to travel far.17PubMed Central. Posterior Tibial Artery Perforator V-Y Advancement Flap for Small–Medium Size Lower Limb Defects The posterior tibial perforator flap is now considered a first-line option for soft-tissue coverage in the lower leg, though careful patient selection and meticulous technique are important for success. Patients with peripheral arterial disease affecting the posterior tibial artery itself are generally poor candidates, since the flap depends on adequate inflow through that artery.18PubMed. Posterior tibial perforator-based flaps for leg and foot defects: Indications, limitations, and technical considerations
Trauma to the Posterior Tibial Artery
The posterior tibial artery is the most commonly injured artery in below-knee trauma. In a review of below-knee arterial injuries, the posterior tibial artery accounted for about 40 percent of cases, slightly more than the anterior tibial artery at 36 percent. Injuries included complete transections, occlusions from blunt force, and pseudoaneurysms. The majority of patients required operative intervention, and among those who went to surgery, arterial ligation (tying off the vessel) was performed about twice as often as bypass grafting.19PubMed Central. Outcomes Following Below Knee Arterial Trauma
Ligation might sound alarming, but below-knee arterial injuries differ from injuries higher up. Because three arteries share the responsibility of supplying the lower leg and foot, tying off one is sometimes acceptable if the other two are intact and collateral circulation is adequate. Surgeons make this judgment based on how the foot looks after clamping the injured vessel: if the foot stays pink and warm with detectable pulses in the remaining arteries, ligation is often the pragmatic choice over a complex repair that carries its own risks of clotting and failure. When the posterior tibial is the only remaining patent vessel, though, repair or bypass becomes essential to save the limb.
Anatomical Variations and the Tarsal Tunnel
Like most arteries, the posterior tibial artery does not follow a textbook path in every person. Variations in where it arises, how many branches it gives off, and how it relates to nearby structures are well documented. In one unusual case, the posterior tibial and fibular arteries were found to cross each other in an “X” pattern before the posterior tibial continued to its normal plantar division, a layout not described in standard anatomy references.20PubMed Central. Clinical features of a rare anatomical variation of the posterior tibial and fibular arteries
One clinically significant variant involves an abnormal perforating branch from the posterior tibial artery that passes through a split in the tibial nerve within the tarsal tunnel. This arrangement has been reported as a cause of tarsal tunnel syndrome, which produces burning pain, tingling, or numbness along the sole of the foot. In one reported case, the patient’s symptoms resolved after the offending perforating branch was ligated and the tarsal tunnel was surgically released.21PubMed. Tarsal tunnel syndrome associated with a perforating branch from posterior tibial artery: a case report While rare, this kind of vascular variant is worth knowing about because tarsal tunnel syndrome is sometimes treated as a purely nerve problem, and standard decompression may fail if the vascular cause is not recognized during surgery.
The distal anatomy of the posterior tibial artery as it passes through the tarsal tunnel and divides into the plantar arteries is an area of active interest for interventional radiologists and foot surgeons, since endovascular therapies are increasingly being performed at this level. Detailed cadaveric studies of the branching patterns, including their variability, provide the anatomical roadmaps that make these procedures safer.22PubMed Central. Anatomical study of the distal course of the posterior tibial artery: A cadaver study