Heel bone: structure, heel pain

The calcaneus is the largest bone in the tarsus, bearing a significant portion of the axial load and transmitting it to the support structure during standing and walking. This is why heel problems often arise with sudden increases in load, prolonged standing, running on hard surfaces, and changes in shock absorption. [1]

The calcaneus doesn't work "alone," but rather as a node within the hindfoot: it articulates with the talus at the top and with the cuboid at the front, and between them, movement and pressure redistribution occur during the gait. These articulations are important not only for anatomy but also for understanding lateral heel pain and feelings of instability on uneven surfaces. [2]

The posterior portion of the heel bone serves as the attachment point for the Achilles tendon, which creates a powerful plantar flexion lever and assists with propulsion during walking, running, and jumping. Any chronic irritation at the attachment site or friction in the bursa surrounding the tendon can manifest as posterior heel pain, especially with shoes with a rigid heel counter. [3]

The plantar surface of the calcaneus is both a support platform and the attachment site for the plantar aponeurosis and long plantar ligament, which support the arch of the foot. Therefore, plantar heel pain is often associated not with the bone itself, but with overload of the soft tissue structures that are anchored to the medial calcaneal tubercle. [4]

Finally, the heel has its own cushioning system—the heel pad—which is designed to distribute pressure. When this pad becomes thin or displaced, the pain often feels like a "bruise in the center of the heel" and intensifies with prolonged standing, which is often mistaken for plantar fasciopathy. [5]

Table 1. The main areas of the heel bone and what typically happens when it is overloaded

Plot	What is this	Why is it important?	Typical pain scenario
Posterior surface and calcaneal tuberosity	Achilles tendon attachment zone	Push lever	Posterior heel pain with weight bearing and shoes
Plantar surface and medial tubercle	Support and insertion site of the plantar aponeurosis	Arch support	Pain when taking the first steps after rest
Superior articular surfaces	Articulation with the talus	Subtalar movements	Lateral pain, "instability"
Anterior articular surface	Articulation with the cuboid bone	Forward load transfer	Pain when turning and on uneven surfaces
Sinus tarsi	The space between the talus and calcaneus with ligaments and fatty tissue	Posterior stability	Lateral pain after twisting

[6]

Anatomical landmarks, joints and important attachments

The calcaneus has six surfaces, each with its own practical landmarks. On the medial surface is the talar support (sustentaculum tali), with a groove for the flexor hallucis longus tendon, and on the lateral surface is the peroneal tubercle, around which the tendons of the peroneal muscles pass. [7]

On the superior surface, the anterior, middle, and posterior articular surfaces of the talus are distinguished, and the grooves of the talus and calcaneus together form the sinus tarsi. This area is rich in ligaments and nerve endings, so after repeated twisting of the foot, chronic pain and a feeling of "looseness" can develop here. [8]

The anterior surface of the calcaneus provides an articular surface for the cuboid bone, forming the calcaneocuboid joint. Clinically, this area is important for midfoot injuries and pain that worsens when walking on uneven surfaces or making sharp turns. [9]

The bone has a rich blood supply via the calcaneal vascular network and innervation by branches of the tibial and sural nerves. This is important for understanding why pain can be mixed: some pain is truly "mechanical," while others are neuropathic due to compression of the nerves in the hindfoot. [10]

Normal variations are common: accessory ossicles, nutrient foramina, pseudocysts on radiographs, and apophysial features in children. These variations can appear alarming on imaging, but they are not diagnostic in themselves and should be interpreted in the context of symptoms. [11]

Table 2. What attaches to the heel bone and what kind of pain it can cause

Structure	Where is it attached?	Function	When overloaded, it hurts more often.
Achilles tendon	Posterior surface of the calcaneal tuberosity	Push-off, plantar flexion	Behind the heel, above the attachment point
Plantar aponeurosis	Plantar surface, closer to the medial tubercle	Longitudinal arch support	Below and medially, especially during the first steps
Long plantar ligament	Plantar surface	Arch stabilization, joint support	Plantarly, when standing for a long time
calcaneofibular ligament	Lateral surface	Ankle stabilization	Laterally after turning
Extensor digitorum brevis	Dorsolaterally	Finger movements	Laterally, sometimes together with pain in the sinus tarsi

[12]

Heel Pain: Symptom Map and Main Causes

Plantar pain (below) in adults is most often associated with plantar fasciopathy: typically, the greatest discomfort occurs with the first steps in the morning or after sitting, then the pain may subside, but return after prolonged use. Moreover, the bone "spur" seen in the image is often a consequence of prolonged tension, rather than an independent cause of pain. [13]

If the pain is felt "in the center of the heel" and resembles a deep bruise, and intensifies with prolonged standing on a hard surface, consider fatty heel pad syndrome. This condition is often confused with plantar fasciopathy because the location is similar, but the pain behavior and point of maximum tenderness are usually different. [14]

Posterior heel pain is most often associated with Achilles tendinopathy or inflammation of the bursa where the tendon attaches, especially if the pain is aggravated by toe rises and shoes with a rigid heel counter. For the medial Achilles tendon, a graduated program of tendon-loading exercises is considered the key treatment method, and complete rest is generally not recommended as a primary strategy. [15]

If pain increases with activity and becomes deep and bony, especially after increased training, long marches, or in the presence of risk factors for decreased bone density, a stress fracture of the calcaneus is a significant possibility. In the early stages, radiographs are often normal, and if clinical suspicion is high, magnetic resonance imaging is preferred. [16]

Neuropathic pain is typically described as burning, shooting, tingling, or numbness, worsening in the evening or at night. Tarsal tunnel syndrome is characterized by pain and paresthesias along the plantar surface, which worsen with walking and can be reproduced with provocative testing, while Baxter's nerve compression typically causes medial plantar pain, often mistaken for plantar fasciopathy. [17]

Table 3. Localization of heel pain and the most likely causes

Where it hurts the most	As described	What is most often suspected	Hint for the difference
Bottom closer to the inner edge	Starting pain when taking the first steps	Plantar fasciopathy	Pain at the medial tubercle, morning peak
Bottom center of the heel	"Bruise", pain when standing	Fat pad heel syndrome	The pain is worse when standing on a hard surface for a long time.
At the back where it is attached	Pain when rising on toes, friction from shoes	Intercalary Achilles tendinopathy, bursitis	Connection with shoes, local swelling at the back
At the back above the attachment	Pain along the tendon	Medial Achilles tendinopathy	Pain 2-6 cm above the attachment
Outside between the ankle and the heel	Pain on uneven surfaces, feeling of instability	Sinus tarsi syndrome	Often after a sprained foot
Medially with burning and paresthesia	Numbness, shooting pains	Tarsal tunnel syndrome, Baxter's nerve	Neurological symptoms, provocation tests

[18]

Table 4. Red flags for heel pain

Sign	Why is it important?	What do they usually do?
Acute pain after falling from a height, inability to support	Risk of calcaneal fracture	Urgent visualization and trauma assessment
Rapidly increasing swelling, severe local pain "in the bone"	Suspected fracture or stress fracture	X-ray, magnetic resonance imaging if necessary
Fever, redness, severe pain at rest	An infection or inflammatory systemic disease is possible.	Urgent in-person assessment and laboratory diagnostics
Numbness of the sole, weakness of the foot muscles	Neuropathy, nerve compression	Neurological assessment and diagnostic clarification
History of cancer, nocturnal pain, progression without weight bearing	Risk of tumor development	Clarifying visualization and profile examination

[19]

Diagnostics: What to ask, what to look for, when to take pictures

The history of heel pain should clarify three things: the nature of the pain, its relationship with stress, and the exact point of maximum pain. Plantar fasciopathy typically causes "starting" pain after rest, a stress fracture causes pain that increases with stress, and neuropathy causes burning and paresthesia. [20]

The examination includes an assessment of the arch of the foot, ankle dorsiflexion, and localized tenderness. Plantar fasciopathy is characterized by tenderness in the sole just anterior to the calcaneal tuberosity, as well as possible limited ankle dorsiflexion, which increases fascial tension. [21]

Imaging isn't necessary for everyone, but it often helps rule out alternatives. X-rays are useful for ruling out fractures and arthritis and can show a heel spur, which alone doesn't prove the cause of pain. Ultrasound and magnetic resonance imaging are usually reserved for atypical cases, suspected fascial ruptures, stress fractures, tumors, or infections. [22]

When a stress fracture is suspected, it is important to remember that early radiographs are often normal. In such cases, magnetic resonance imaging is better at detecting early bone marrow changes and stress injury lines and is therefore considered the preferred method if suspicion persists.[23]

In children, a common cause of posterior heel pain is calcaneal apophysitis (Sever's disease), which is associated with traction on the Achilles tendon during growth. Diagnosis is usually clinical, with radiography used primarily to rule out other causes, and magnetic resonance imaging (MRI) is used to rule out infection or tumor. [24]

Table 5. Examination methods for heel pain and what they add

Method	What shows best	When it is especially useful	Restrictions
Inspection and palpation	Pain point, type of pain, provocations	To everyone at the first stage	Requires comparison with anamnesis
Foot X-ray	Fractures, arthritis, spurs as a find	Trauma, atypical course	Early stage stress fractures are often not visible.
Ultrasound examination	Fascia, tendons, bursae, sometimes nerves	Suspicion of fasciopathy, bursitis	Depends on experience, does not replace magnetic resonance imaging in bone pathology
Magnetic resonance imaging	Bone, fascia, tendons, soft tissue	Stress fracture, tumor, infection, vague pain	Not always necessary in a typical clinic
Computed tomography	Detailing of complex fractures and articular surfaces	Severe heel injury	Less soft tissue information than magnetic resonance imaging

[25]

Treatment: Step-by-step strategies for the most common scenarios

For plantar fasciopathy, the primary focus is on conservative measures: stretching the calf muscles and plantar fascia, training in load control, temporary limitation of impact loads, and selection of footwear with arch support. Clinical guidelines for non-arthritic heel pain emphasize exercise, stretching, taping, and orthotics as the primary interventions. [26]

The prognosis for plantar fasciopathy is generally favorable, but recovery takes time: a significant proportion of patients improve within 9-12 months, while surgery is required for a minority. It's important to discuss this upfront to avoid resorting to invasive interventions too early and becoming frustrated with "slow" improvement. [27]

Glucocorticosteroid injections can provide short-term relief, but repeated injections are associated with the risk of plantar fascia rupture and heel fat pad atrophy. Therefore, injections are generally considered an option for severe pain, after basic measures and with a cautious risk assessment. [28]

For Achilles tendinopathy, a program of tendon exercises, with loads as high as tolerated and at least twice a week, is considered a central component of treatment. Clinical guidelines for Achilles tendinopathy also emphasize that complete rest is not usually indicated as a primary strategy, and activity should be maintained within the limits of pain tolerance. [29]

If a stress fracture is suspected, the main mistake is to continue to put weight on the heel. Typical management includes unloading, sometimes immobilization in a brace or boot, and a gradual return to weight bearing after pain subsides and healing is confirmed clinically and according to a follow-up plan. [30]

In children, treatment for calcaneal apophysitis is usually conservative: relative rest, depending on the level of pain, cold therapy, heel pads or heel lifts, anti-inflammatory medications if necessary, and stretching and strengthening the calf muscles. The condition is usually self-limiting and resolves as the growth plate closes. [31]

Table 6. Step-by-step treatment strategy based on the probable cause of heel pain

Scenario	1 line	2nd line	When is face-to-face escalation necessary?
Plantar fasciopathy	Stretching, unloading, shoes and insoles, taping, night splints as indicated	Shock wave therapy as indicated, injections with caution	Pain for more than 6-12 months despite treatment, atypical signs
Fat pad heel syndrome	Cushioning heel pads, shoes with shock absorption, limiting standing on hard surfaces	Custom orthoses, gait correction	Persistent pain and loss of support, ruling out fracture and neuropathy
Achilles tendinopathy	Weight-bearing exercises, activity modification, sometimes heel pads as a temporary measure	Additional rehabilitation for movement and strength deficits	Progression of pain, severe swelling, suspicion of rupture
Stress fracture of the calcaneus	Immediate unloading, orthosis or boot as needed	Clarifying visualization, gradual return plan	Pain persists, pain increases with exertion, risk factors for bone fragility
Tarsal tunnel syndrome and Baxter's nerve	Reducing the provoking load, biomechanical orthoses, treatment of the underlying cause	Clarification of diagnosis, injections if necessary, and surgical decompression in case of resistance	Numbness, weakness of the foot muscles, long-term without improvement
Sever's disease in children	Relative rest, cold, heel pads, calf strain	Brief immobilization for severe pain syndrome	Suspected infection, tumor, no improvement

[32]

Prevention and self-monitoring of stress

Preventing heel pain almost always involves load management: gradually increasing training volume, alternating high-impact and low-impact activities, adequate recovery, and weight management if excessive. This is especially important for reducing the risk of overuse and stress injuries to the bone. [33]

Shoes and insoles are important for pressure distribution and arch support, but they work best with exercise. For plantar fasciopathy, regular stretching of the calf muscles and plantar fascia is especially important, while for Achilles tendinopathy, planned tendon loading is appropriate and tolerable. [34]

For self-monitoring, a simple "where and when it hurts" logic is helpful: a morning peak in pain is more likely to be associated with fasciopathy, bone pain after exercise is more likely to be associated with stress injury, and burning and numbness are more likely to be associated with neuropathy. This classification doesn't replace diagnostic testing, but it does help quickly select the correct examination route. [35]

If pain changes typical behavior, night pain develops, swelling increases, difficulty supporting weight, or neurological symptoms occur, an in-person evaluation should not be delayed. These signs most often indicate the need to rule out a fracture, infection, tumor, or significant neuropathy. [36]