Classification and clinical presentation
According to the anatomical classification, there are three main locations of talar injuries: fracture of the neck, fracture of the body, and fracture of the posterior process.
Clinically, the injury manifests as pronounced pain syndrome in the ankle joint area. The following symptoms are diagnostically significant:
- Maximum tenderness occurs upon palpation at the moment the physician attempts to reproduce dorsiflexion of the patient's foot.
- Sharp pain is triggered by axial load on the limb, as well as by gentle percussion on the heel.
Epidemiologically, one should keep in mind injuries to adjacent structures: thus, calcaneal fractures account for up to 50% of all foot bone fractures and about 3% of the total number of skeletal bone fractures.
Radiological diagnostics
Radiography is the gold standard for initial diagnostics.
- Standard examination is performed in anteroposterior and lateral projections.
- The most informative is recognized to be the lateral projection. When analyzing the radiograph, the traumatologist must pay special attention to the correct alignment of the articular surfaces of the posterior subtalar joint.
- In dubious situations, when standard radiographs do not provide a clear picture, an oblique projection is prescribed (performed with 20° internal rotation of the foot) or computed tomography (CT) is resorted to.
Pre-hospital stage
The quality of first aid directly affects the risk of complications. The main measures include:
- Pain relief: exclusively systemic analgesics are used. Administration of a local anesthetic directly into the fracture area before admission to the hospital or emergency room is strictly prohibited.
- Immobilization: carried out using transport splints (pneumatic, ladder, or improvised). The splint must reach the upper third of the lower leg, providing complete rest to the damaged segment.
Conservative treatment tactics
The choice of method depends on the location and presence of fragment displacement.
- Fracture of the posterior process: the mildest option. Requires application of a plaster cast or tight bandaging for a period of 2–3 weeks.
- Fractures without displacement: immobilization with a plaster cast reaching the upper third of the lower leg. The duration of wearing the cast is 8–10 weeks.
- Neck fracture with displacement: requires closed manual reduction. The physician performs traction by the foot in a position of extreme equinus (plantar flexion) strictly along the axis of the leg, after which smoothly brings the foot into a 90-degree flexion position. The duration of subsequent immobilization reaches 2.5–3.5 months.
Surgical treatment and rehabilitation
If closed reduction is ineffective, surgical intervention is indicated — open reduction and internal fixation. Surgery must be performed as early as possible, optimally within the first day after the injury.
Features of cast management and recovery:
- At the stage of cast application, it is critically important to carefully model the arch of the foot.
- Physiotherapy procedures start as early as the immobilization period.
- After removing the cast, massage, therapeutic exercises (physical therapy), and mechanotherapy are prescribed. The main goal is the complete restoration of the range of motion and the correct formation of the foot arch.
- As a prevention of post-traumatic flatfoot, the patient is indicated for the mandatory wearing of arch supports for up to 1 year.
Among formidable complications are avascular necrosis of the talus and post-traumatic osteoarthritis. The only way to prevent them is the most accurate fragment reduction and reliable, continuous immobilization for the entire period of bone healing.
Briefly: answers to topical questions
Which vessels supply blood to the talus and what is their vulnerability in fractures?
Blood supply to the talus is carried out through vessels entering at a narrow area of the neck and sinus. The vulnerability of blood flow during injuries is due to the following factors:
- Limited sources — there are few intraosseous anastomoses, and more than half of the bone surface is covered with cartilage.
- Absence of periosteum — the talus lacks a periosteum, so fractures heal with considerable difficulty.
- Risk of ischemia — in neck and body fractures, the blood supply is interrupted, leading to the frequent development of aseptic (avascular) necrosis.
Class and exam questions
Is it possible to anesthetize the fracture site with a local anesthetic during first aid administration?
No, the administration of local anesthetics to the fracture area at the pre-hospital stage is strictly prohibited. Only systemic analgesics are allowed to be used.
Which radiographic projection provides the most information in a talar injury?
The lateral projection is the most informative, as it allows assessing the alignment of the articular surfaces of the posterior subtalar joint.
How long do you need to wear a cast for a displaced talar neck fracture?
After successful closed reduction, immobilization lasts from 2.5 to 3.5 months.
How to prevent the development of flatfoot after a talar fracture?
Careful modeling of the foot arch during cast application is necessary, and after its removal — wearing arch supports for 1 year and active physical therapy.
What else to study on this topic
- Mechanisms of development of avascular necrosis of the talus
- Methods of open reduction and internal fixation of foot bones
- Biomechanics of the subtalar joint
- Computed tomography in the diagnosis of occult foot injuries
- Detailed classification of calcaneal fractures
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