Leg sprain: what it is and how it manifests itself

A sprain is a ligament injury caused by excessive strain on a joint, most commonly the ankle, less commonly the knee, or small joints of the foot. The ligament is partially or completely torn, causing pain, swelling, and limited support and movement. Ankle injuries are among the most common injuries in both athletes and the general population. [1]

Most cases involve lateral inversion of the foot with hyperextension of the anterior talofibular ligament; less commonly, the deltoid ligament is injured with outward rotation. A separate category is the so-called "high" sprain—damage to the syndesmosis between the tibia and fibula. These variants differ in symptoms, recovery time, and management strategies. [2]

Even a mild injury can have long-term consequences: repeated sprains, a feeling of instability, decreased pain-free walking distance, and limitations in sports. Chronic ankle instability develops in 10-40% of affected individuals, with persistent complaints 12 months or longer. Early recognition and proper rehabilitation significantly reduce the risk of chronicity. [3]

Current recommendations combine three key pillars of care: accurate clinical and instrumental diagnostics, early functional management in the acute phase, and criterion-based rehabilitation with relapse prevention. This approach accelerates recovery, reduces the incidence of recurrent injuries, and decreases the likelihood of chronic instability. [4]

Causes and mechanisms

The classic mechanism is a sudden inversion and internal rotation of the foot when landing from a jump, descending stairs, changing direction, or wearing unstable shoes. This causes the lateral ligaments to rupture. Eversion with overstretching of the deltoid ligament is less common, usually with external impact or a fixed foot. [5]

A "high" syndesmosis strain occurs with external rotation of the foot and dorsiflexion of the ankle. Damage to the anterior inferior tibiofibular ligament and interosseous membrane requires a different approach: more often, longer-term immobilization and more careful loading. Undiagnosed syndesmosis injury is one of the reasons for delayed recovery. [6]

Risk factors include a previous strain, insufficient calf muscle strength and endurance, limited dorsiflexion, impaired proprioception, and a lack of preventative balance training in those involved in sports involving jumping and sudden stops. Addressing these factors is the key to prevention. [7]

The risk of recurrence is highest in the first 4-6 weeks, when the tissues remain vulnerable and range of motion and joint control have not yet been restored. This justifies the need for early, but measured, loading and the use of external support during high-risk activities. [8]

Symptoms and typical signs

Lateral sprains are characterized by sudden pain on the lateral side of the ankle, rapidly increasing swelling, bruising within 24-48 hours, tenderness on palpation of the anterior talofibular area, and painful limitation of weight-bearing. In severe cases, weight-bearing is impossible immediately after the injury and at the time of examination. [9]

High sprains are characterized by pain above the ankle, which intensifies with external rotation of the foot, a feeling of "bursting" between the shin bones, and tenderness when squeezing the shin. These injuries take longer to recover and often require immobilization. [10]

Signs that indicate the need to urgently exclude a fracture include: inability to take four steps immediately after the injury and during examination, localized bone tenderness along the posterior edges and tips of the malleoli, at the base of the fifth metatarsal, or in the navicular region. These criteria are described in the "Ottawa Rules" and help guide the judicious use of X-rays. [11]

Additional "red flags" include: severe deformity, increasing numbness of the foot, sudden pallor and cold skin, rapidly increasing swelling with diffuse pain and fever. These situations require immediate medical attention. [12]

Table 1. Red flags for sprains and recommended actions

Sign	What is dangerous?	Action
Inability to support immediately and upon examination	Fracture, severe instability	Ottawa Standards Radiography, Urgent Assessment
Localized bone pain at the edges of the ankles, at the base of the 5th metatarsal, in the navicular area	Possible fracture	X-ray of that area
Pain above the ankles with external rotation, pain with compression of the shin	Syndesmosis injury	Immobilization, clarifying visualization
Numbness, paleness, cold skin	Neurovascular disorder	Go to the emergency room immediately
Summarized by manuals. [13]

Classification and severity

Grade 1 – microfiber damage without significant mechanical instability. Pain is moderate, swelling is limited, and weight-bearing is possible with discomfort. Return to daily activities usually occurs within 1–2 weeks with early functional intervention. [14]

Grade 2 – partial rupture with moderate mechanical instability, noticeable swelling, and hematoma. Support is limited, and walking is difficult. Recovery takes 3 to 6 weeks with proper rehabilitation. [15]

Grade 3 – complete rupture, severe instability, inability to support the joint, significant swelling, and hematoma. Brief immobilization followed by a functional program is initiated; recovery time ranges from 6 to 12 weeks and depends on associated injuries. [16]

High syndesmosis sprains are a separate category. In the absence of diastasis, conservative treatment with longer immobilization is possible; in cases of diastasis or associated fractures, surgical treatment is indicated. [17]

Table 2. Ankle sprain grades: signs and timeframes

Degree	Damage	Support	Estimated timeframes
1	Micro-explosions	Possible	1-2 weeks
2	Partial rupture	Difficult	3-6 weeks
3	Complete break	Impossible	6-12 weeks
Syndesmosis without diastasis	Syndesmotic ligaments	Limited	Longer than average terms
Syndesmosis with diastasis	Stability is broken	Impossible	Surgery is often required
Summarized from sources. [18]

Diagnostics

The first step is a clinical assessment of the mechanism of injury, location of pain, swelling, and support. An examination is performed, along with palpation of the ligamentous areas and a range of motion check. To rule out a fracture, the Ottawa Rules are used, which determine the indications for ankle and foot radiography. [19]

Specific tests are then performed. For lateral injuries, the anterior drawer and talar-tilt are used, while for syndesmosis injuries, the external rotation and tibia "compression" tests are used. The sensitivity and specificity of individual tests are limited, so they are interpreted in combination and based on the clinical picture. [20]

If radiography does not reveal a fracture, but pain and dysfunction persist for more than 1 week and less than 3 weeks, the criteria of the relevant radiological society are relevant: if osteochondral damage or severe ligamentous injury is suspected, magnetic resonance imaging is preferred; if a displaced fracture is suspected, computed tomography is preferred. [21]

If signs of syndesmotic instability or deformity are present, stress imaging and, if necessary, magnetic resonance imaging are performed to determine the extent of soft tissue damage. An important clinical marker is tenderness of the proximal fibula, which requires imaging of the tibia to rule out a Mesonev fracture. [22]

Table 3. Ottawa Rules in simplified form

Pain zone	Additional criterion	An x-ray is needed
Ankle area	Inability to take 4 steps or bone tenderness along the back edges and tops of the ankles	Yes
Midfoot	Inability to take 4 steps or pain at the base of the 5th metatarsal or in the navicular area	Yes
Summary of manuals. [23]

Treatment of the acute period: functional tactics

Current clinical guidelines recommend early, protected weight-bearing with external support rather than prolonged, complete immobilization. Elastic bandaging, braces, or tape, leg elevation, and gradual walking, as tolerated, are used. In severe injuries, short-term immobilization for a few days to control pain and swelling is acceptable, followed by a transition to a functional program. [24]

The "PEACE and LOVE" approach complements traditional measures: protection, elevation, compression, patient education, followed by gradual loading, supportive care, vascular activity, and exercise. This approach emphasizes caution with the early use of anti-inflammatory agents, as excessive suppression of inflammation could theoretically impede tissue regeneration. [25]

The use of nonsteroidal anti-inflammatory drugs remains controversial. Reviews point to possible delays in bone fusion and a controversial effect on soft tissue healing, while clinical practice also takes into account the analgesic effect. In the acute phase, analgesics may be used, focusing on the balance of benefits and risks, preferably in the lowest effective doses and for a short period. [26]

If a syndesmosis injury without diastasis is suspected, more rigorous rotational load protection is initiated, often with a boot-orthosis and a longer restriction phase. In cases of obvious instability or associated fractures, surgical treatment is considered. [27]

Table 4. Acute period: what to do in the first days

Measure	Target	Comment
Protection and elevation of the limb	Reducing swelling and pain	Brief immobilization is acceptable in severe trauma.
External support	Micro-movement control	Orthosis or tape depending on tolerance
Dosed walking	Stimulating recovery	Based on pain, with an early transition to exercise
Anesthesia	Pain control	Individual selection of products, short course
Summarized by manuals. [28]

Rehabilitation: phases, goals and progress monitoring

Rehabilitation is structured in phases, with progression to the next level occurring when clear criteria are met. Phase 1: pain and swelling control, restoration of dorsiflexion, gentle joint mobilization, isometric exercises, and step-by-step tolerant walking. Phase 2: active restoration of range of motion and strength, balance and coordination exercises. [29]

Phase 3: Complex proprioception, jumping and turning tasks, multiplanar movement patterns, acceleration and deceleration. Phase 4: Return to sport criteria with tests of jumping, landing, change of direction, and assessment of confidence and a sense of stability. Manual therapy is allowed as an adjunctive method for restoring range of motion and reducing pain. [30]

It's important to monitor not just calendar dates but also the fulfillment of criteria: pain-free walking and jogging, symmetrical range of motion, strength and control of landings, and the absence of post-workout swelling. If pain or a feeling of "sinking" persists, a repeat assessment and clarifying visualization are recommended. [31]

For high sprains, return to running and rotational loads is delayed until syndesmosis stability is restored. Loads are increased carefully, with an emphasis on rotational control and strength training of the outer ankle. [32]

Table 5. Phases of rehabilitation and transition benchmarks

Phase	Main tasks	Transition criteria
1	Pain and swelling control, dorsiflexion, isometrics	Low-intensity pain at rest, improved range of motion
2	Strength and range of motion, balance on unstable surfaces	Symmetrical dorsiflexion, pain-free walking
3	Plyometrics, rotations, multi-plane tasks	No swelling after exercise, landing control
4	Comprehensive sports tests and specific skills	Meeting the criteria for returning to sport
Summary of sources. [33]

Return to sports and active work

To help make decisions about returning to sport, the PAASS hexagonal framework is proposed: pain, joint and muscle impairment, perception of stability and psychological readiness, sensorimotor control, and sports-functional testing. Domain-based assessment helps move beyond a simple time-based approach and reduce the risk of relapse. [34]

A promising tool is the Ankle-GO scale. A low score two months after injury has been shown to be associated with a significantly higher risk of recurrence within six months. The use of objective questionnaires and functional tests improves the accuracy of decision-making. [35]

During periods of increased risk, external support may be appropriate during training and competition. Sports data demonstrate that orthoses reduce the incidence of acute strains in adolescent and adult athletes playing basketball and football. The type of support is selected individually, taking into account comfort and the objectives of the sport. [36]

Even after a successful return to sports, it is important to maintain a program of proprioception and ankle strength training, as regular balance training reduces the likelihood of re-injury. A minimum of 6-8 weeks of targeted exercises followed by a maintenance regimen is recommended. [37]

Table 6. Return to sport criteria by PAASS domains

Domain	Examples of criteria
Pain	Low pain when running, jumping and in the last 24 hours
Joint and muscles	Symmetrical dorsiflexion, strength, endurance
Perception	Confidence in the joint, feeling of stability
Sensorimotor control	Balance, postural control, landing tests
Sports function	Jump and turn tests, full training session
Guide Summary. [38]

Relapse prevention

Balance training significantly reduces the risk of recurrent strains by improving postural control and proprioception. Both simple stances on unstable surfaces and complex tasks involving closed eyes, a ball, and sudden changes in direction are effective. The greatest effect was observed in individuals with previous injuries. [39]

The use of removable braces during high-stress seasons reduces the incidence of acute strains, especially in team sports. Randomized trials show a significant reduction in risk in schoolchildren, without increasing the severity of injuries. The choice between tape and braces depends on availability, cost, and preference. [40]

Strength training of the calf and foot muscles, restoration of dorsiflexion, and mobility of the capsular-ligamentous apparatus are essential elements of prevention. Combined strength and balance programs produce more pronounced effects than isolated approaches. [41]

Prevention includes choosing the right footwear with a stable sole and sufficient toe box width, gradually increasing running and jumping loads, and monitoring body weight. For contact with uneven ground, careful running on trails with careful landings is helpful. [42]

Table 7. Preventive measures and expected effect

Measure	Effect
Balance program ≥6-8 weeks	Reduced risk of relapse, improved control
Removable orthosis for risk activities	Reducing the incidence of acute sprains
Strength and mobility	Improved landing mechanics
Shoes and gradual increase of loads	Reducing peak overloads
Summarized from sources. [43]

Complications and when a surgeon is needed

Prolonged pain and swelling, a feeling of "twisting," fear of support, and limited activity indicate the development of chronic instability. This condition occurs in 10-40% of patients, especially with incomplete rehabilitation or associated injuries. This group has an increased risk of osteochondral lesions of the talus and peroneal tendon pathology. [44]

If symptoms of mechanical instability persist despite a comprehensive strengthening and proprioception program, a more in-depth examination is indicated, including magnetic resonance imaging to rule out intra-articular damage. If instability and functional impairment are confirmed, ligament reconstruction followed by rehabilitation is performed. [45]

In the case of syndesmosis damage, the solution depends on the stability of the distal tibiofibular joint. In the presence of diastasis or associated fractures, surgical restoration is indicated, as chronic syndesmosis failure leads to arthrosis and persistent pain. [46]

Signs that require a follow-up visit include increased pain and swelling after light exertion, instability when walking on uneven surfaces, repeated twisting, deep joint pain, clicking, and "jamming." Early diagnosis can help avoid long-term restrictions. [47]

Table 8. When to refer to an orthopedic traumatologist

Situation	Reason for referral
Persistence of severe pain and swelling after 2-3 weeks	Exclusion of osteochondral lesion
Feeling of "falling through" and recurrence of twisting	Assessment of chronic instability
Suspected syndesmosis injury	Deciding on immobilization or surgery
Confirmed diastasis or fractures	Surgical stabilization as indicated
Summarized by manuals. [48]

Forecast

Recovery times depend on the severity and type of injury, the quality of rehabilitation, and adherence to progression criteria. For mild injuries, return to normal activity is possible in 1-2 weeks, for moderate injuries in 3-6 weeks, and for severe injuries in 6-12 weeks. Severe strains require a longer course and careful loading. [49]

The risk of relapse is highest in the first weeks after resuming activity, so external support during these risky stages and continuing the balance program are important. Clear communication about goals and criteria helps individuals return to sports safely and confidently. [50]

With a functional approach and criteria-based management, most people fully regain range of motion, strength, and joint control. Proper prevention and supportive exercises help consolidate the results and reduce the likelihood of further episodes. [51]