Ankle Sprain
Lower LimbOverview
Ankle sprain is the most common ligamentous injury of the lower limb, typically involving the lateral ligament complex due to inversion trauma. The severity ranges from mild stretching to complete ligamentous rupture, classified as Grade I (mild), Grade II (moderate), or Grade III (severe). Proper assessment and early intervention are critical to prevent chronic ankle instability and functional impairment.
Pathophysiology
Ankle sprain occurs when the ankle is forcibly inverted, most commonly affecting the anterior talofibular ligament (ATFL), calcaneofibular ligament (CFL), and posterior talofibular ligament (PTFL). The mechanism typically involves sudden inversion with the foot plantarflexed, causing ligamentous tearing and micro-ruptures. Subsequent inflammation, swelling, and proprioceptive deficits develop, with potential involvement of the syndesmotic ligaments in higher-energy injuries. Chronic instability can result from inadequate rehabilitation and proprioceptive retraining.
Typical Presentation
Site
Lateral ankle, particularly around the anterior talofibular and calcaneofibular ligaments; may involve medial ankle (less common) and anterior ankle syndesmosis
Quality
Sharp, stabbing pain at moment of injury; progressing to throbbing, aching pain; sensation of instability or 'giving way'
Intensity
Mild sprains: 2-4/10 pain with weight-bearing; moderate: 5-7/10; severe: 8-10/10 with inability to bear weight
Aggravating
Weight-bearing and walking, particularly on uneven surfaces; inversion movements; running and pivoting; stairs; prolonged standing
Relieving
Rest and elevation; ice application; immobilization; non-weight-bearing positions; gentle ankle movements within pain-free range
Associated
Swelling and ecchymosis (especially lateral ankle and foot dorsum); reduced ankle dorsiflexion and plantarflexion; proprioceptive deficits; difficulty with single-leg stance; peroneal muscle weakness; possible joint effusion; altered gait pattern
Orthopaedic Tests
Anterior Drawer Test
Procedure
Patient seated or supine with knee flexed to 90°. Stabilize the distal tibia with one hand and grasp the calcaneus with the other, pulling the foot anteriorly while assessing for abnormal translation of the talus.
Positive Finding
Excessive anterior translation of the talus relative to the tibia, or reproduction of instability compared to the unaffected side
Sensitivity / Specificity
72% / 96%
Hertel et al., 1999, Journal of Athletic Training
Interpretation
Suggests anterior talofibular ligament (ATFL) insufficiency; positive result indicates mechanical instability from lateral ankle ligament injury
Inversion Stress Test (Supine or Sitting)
Procedure
Patient supine or seated with knee extended or slightly flexed. Invert the foot passively through the ankle's available range while palpating the lateral ligaments for pain, laxity, or end-feel changes.
Positive Finding
Pain over lateral ligaments (ATFL or calcaneofibular ligament), increased inversion range, or soft end-feel suggesting ligament laxity
Sensitivity / Specificity
68% / 91%
Interpretation
Pain indicates acute inflammation; laxity suggests chronic ligament insufficiency; guides prognosis and rehabilitation needs
Syndesmotic Squeeze Test (Tibia-Fibula Compression)
Procedure
Patient seated or supine. Squeeze the tibia and fibula together at mid-calf level, progressing distally toward the ankle mortise while observing for pain in the syndesmotic region above the ankle joint.
Positive Finding
Pain in the anterior or posterior tibiofibular ligament region, particularly above the ankle mortise
Sensitivity / Specificity
See current literature / See current literature
Interpretation
Suggests syndesmotic (high ankle) sprain; positive result warrants imaging to assess for syndesmotic injury, which requires longer recovery
Talar Tilt Test
Procedure
Patient supine or seated with knee flexed to 90°. Stabilize the distal tibia; invert the calcaneus and assess the amount of talar tilt and the quality of the end-feel.
Positive Finding
Excessive inversion of the talus (>10° compared to unaffected side) or soft/absent end-feel indicating ligament laxity
Sensitivity / Specificity
54% / 97%
Hertel et al., 1999, Journal of Athletic Training
Interpretation
Indicates calcaneofibular ligament (CFL) insufficiency or combined ATFL/CFL injury; high specificity makes positive result clinically significant
Single Leg Stance (Balance) Test
Procedure
Patient stands on the affected leg with eyes open for up to 30 seconds, or with eyes closed to increase difficulty. Observe for loss of balance or arm movements required for stability.
Positive Finding
Inability to maintain balance for 30 seconds, excessive trunk sway, or stepping down (in eyes-closed version, inability to hold ≥10 seconds)
Sensitivity / Specificity
See current literature / See current literature
Interpretation
Indicates proprioceptive deficit and functional impairment; useful for assessing residual instability and rehabilitation progress; positive finding suggests need for balance retraining
Weight-Bearing Ankle Dorsiflexion Test
Procedure
Patient stands against a wall in a staggered stance with the affected leg behind. Keeping the heel on the ground, flex the knee and translate the body weight forward over the affected ankle, noting the distance from heel to wall where dorsiflexion reaches 10° or maximal available range.
Positive Finding
Reduced weight-bearing dorsiflexion range compared to unaffected side (>4 cm difference in distance from wall), pain, or inability to achieve 10° dorsiflexion
Sensitivity / Specificity
See current literature / See current literature
Interpretation
Indicates dorsiflexion range limitation from pain, swelling, or capsular restriction; predicts functional limitation and recovery status; useful for tracking rehabilitation progress
⚠ Red Flags
- •Severe, uncontrolled swelling or signs of compartment syndrome (increasing pain with passive stretching, paresthesia, pallor)
- •Signs of neurovascular compromise (absent dorsalis pedis or posterior tibial pulses, cold foot, persistent numbness)
- •Fracture suspected (inability to bear weight on foot, severe deformity, bony tenderness at lateral malleolus or base of fifth metatarsal)
- •High-energy mechanism with syndesmotic involvement (tibia-fibula separation, positive anterior drawer or external rotation tests)
- •Open wound or signs of infection (fever, spreading erythema, purulent discharge)
- •Recurrent sprains with progressive instability despite conservative management
⚡ Yellow Flags
- •Fear-avoidance beliefs regarding ankle movement and weight-bearing
- •Catastrophizing about ankle stability and future re-injury
- •Secondary psychological distress affecting rehabilitation motivation
- •Unrealistic expectations regarding recovery timeline
- •History of multiple previous ankle sprains suggesting behavioral or proprioceptive deficits
- •Delayed presentation or reluctance to engage in rehabilitation
- •Social or occupational factors limiting compliance with exercise program
Osteopathic Techniques
Region
Lateral ankle ligaments (ATFL, CFL, PTFL)
Technique
Soft Tissue
Rationale
Soft tissue mobilization to surrounding musculature (peroneus longus and brevis, extensor digitorum longus) reduces muscle splinting, improves circulation, promotes resorption of swelling, and restores normal tissue extensibility. Reduces pain and improves ankle proprioception.
Region
Talocrural and subtalar joints
Technique
Articulation
Rationale
Gentle passive and active articulation within pain-free ranges promotes synovial fluid distribution, maintains joint nutrition, restores normal arthrokinematics, and prevents joint stiffness during acute and subacute phases. Improves proprioceptive feedback.
Region
Peroneal muscles and compartments
Technique
MET
Rationale
Muscle energy techniques restore normal muscle length-tension relationships, improve eccentric control of peroneal muscles (critical for lateral ankle stability), reduce muscle guarding, and facilitate proprioceptive neuromuscular re-education.
Region
Lower leg, foot, and lumbar fascia
Technique
Soft Tissue
Rationale
Fascial release techniques improve fluid dynamics throughout the lower limb, reduce fascial restrictions that may limit ankle mobility, enhance proprioceptive input through mechanoreceptor stimulation, and promote drainage of inflammatory exudate.
Region
Proximal lower limb (hip, knee, tibiofibular joint)
Technique
Articulation
Rationale
Assessment and treatment of proximal joints addresses kinetic chain dysfunction that may predispose to ankle injury; restores normal weight-bearing mechanics and reduces compensatory ankle stress during recovery.
Region
Lumbar spine and pelvis
Technique
MET
Rationale
Addressing spinal and pelvic dysfunction optimizes proprioceptive input from postural centers and improves overall motor control patterns, reducing re-injury risk and supporting functional recovery of ankle stability.
Add-On Approaches
Chinese Medicine
Acupuncture and moxibustion to local points (GB34 Yanglingquan, ST41 Jiexi, GB40 Qiuxu) and distal points (LV3 Taichong) to promote Qi-Blood circulation, reduce inflammation, and support ligamentous healing. Cupping therapy over the lateral ankle to improve local circulation.
Chiropractic
Ankle manipulation to restore normal joint mechanics; mobilization of the subtalar and talocrural joints; evaluation and correction of foot pronation/supination patterns; proprioceptive retraining using balance boards.
Physiotherapy
Progressive proprioceptive retraining (balance board, single-leg stance); resisted ankle strengthening (eversion, inversion, dorsiflexion, plantarflexion); functional balance and agility drills; sport-specific movement patterns; gait retraining; external ankle bracing strategies.
Remedial Massage
Soft tissue massage to peroneal muscles, lateral compartment, and intrinsic foot muscles; trigger point release; myofascial release to reduce muscle guarding; drainage massage techniques to promote swelling resolution.
Rehabilitation Exercises
Ankle Alphabet Exercise
Ankle Dorsiflexion and Plantarflexion Pumps (Supine)
Calf Stretch (Standing Wall or Lunge Position)
Anterior Tibialis Stretch (Kneeling or Seated)
Isometric Ankle Inversion with Resistance Band (Seated)
Isometric Ankle Eversion with Resistance Band (Seated)
Seated Heel Raises
Standing Calf Raises (Double Leg Progression to Single Leg)
Single-Leg Stance on Firm Surface
Single-Leg Stance on Foam or Balance Pad
Single-Leg Stance with Upper Limb Movements (Head Turns, Arm Reaches)
Lateral Hop-and-Hold (Controlled Lateral Weight Shifts)
Referral Criteria
- •Suspected fracture (lateral malleolus, medial malleolus, base of fifth metatarsal, talar dome) requiring imaging and orthopedic evaluation
- •Signs of syndesmotic involvement (high ankle sprain) with persistent instability or inability to weight-bear after 1 week
- •Neurovascular compromise requiring urgent vascular assessment
- •Signs of compartment syndrome requiring emergency intervention
- •Grade III (severe) ankle sprain with complete ligamentous rupture or persistent significant instability after 2-3 weeks of conservative management
- •Recurrent ankle sprains (≥3 in previous 12 months) suggesting chronic instability or neuromuscular deficit requiring specialist assessment
- •Failure to progress in pain or functional recovery after 4 weeks of appropriate conservative treatment
- •Associated injuries to other structures (syndesmotic ligaments, peroneal tendon subluxation, osteochondral lesions of talus) detected on imaging
- •Psychological distress, catastrophizing, or fear-avoidance significantly impacting rehabilitation adherence
- •Chronic ankle instability affecting quality of life or occupational/sporting function despite conservative management