A medial ankle sprain is an injury to the ligaments on the inside of the ankle, most commonly involving the deltoid ligament complex. This ligament is a strong, fan-shaped structure that stabilises the ankle and prevents the foot from collapsing inward (eversion). Compared to lateral ankle sprains, medial ankle sprains are less common because the deltoid ligament is thicker and stronger.
Medial ankle sprains usually occur when the foot is forced into eversion (rolling outward) and dorsiflexion, often with rotation. This can happen during contact sports, awkward landings, or when the ankle is forced outward while the foot is planted. Because of the force required, medial ankle sprains are more likely to be associated with other injuries, such as fractures or syndesmosis involvement, which must be carefully assessed.
This page focuses on isolated or standard medial ankle sprains involving the deltoid ligament. Injuries involving the ankle syndesmosis (often referred to as “high ankle sprains”) are managed differently and are covered elsewhere. A physiotherapist will always screen for syndesmosis injury and fracture when medial ankle pain is present.
Physiotherapy for medial ankle sprain is essential for restoring ankle stability, confidence, and function. Even when pain and swelling improve quickly, deficits in strength, balance, and movement control can persist and increase the risk of reinjury or chronic ankle problems if not addressed through structured rehabilitation.
Key Facts
- Medial ankle sprains involve injury to the deltoid ligament complex and are less common than lateral ankle sprains due to the ligament’s strength and anatomical support.
- Clinical reviews note that medial ankle sprains often occur with eversion injuries and require careful assessment to exclude fracture or syndesmosis involvement.
- Evidence-based guidelines support early functional rehabilitation with progressive exercise and balance training following ankle ligament injuries.
- Persistent symptoms and instability can occur after ankle sprains when rehabilitation is incomplete, highlighting the importance of physiotherapy.
Risk Factors
- Contact sports or situations where an external force pushes the ankle outward.
- Previous ankle sprain or history of ankle instability.
- Poor balance or delayed neuromuscular control.
- Reduced ankle dorsiflexion affecting landing mechanics.
- Returning to sport before full strength and control are restored.
Symptoms
- Pain and tenderness on the inside of the ankle, often around the medial malleolus.
- Swelling on the medial side of the ankle, which may spread into the arch of the foot.
- Pain with walking, especially during push-off and when turning.
- Pain when the ankle is forced outward (eversion) or into dorsiflexion.
- A feeling of instability or lack of trust in the ankle during weight-bearing.
- Reduced ankle range of motion due to pain and swelling.
- Difficulty with single-leg tasks such as standing, hopping, or stair negotiation.
Aggravating Factors
- Walking long distances, especially early after injury.
- Uneven surfaces that force the foot into eversion.
- Running, jumping, and landing activities before strength and control return.
- Sporting activities involving contact or rapid changes of direction.
- Prolonged standing when swelling is present.
Causes
Medial ankle sprains occur when the deltoid ligament is overloaded, most commonly through an eversion mechanism where the foot rolls outward relative to the leg. This often happens when an external force is applied, such as contact from another player, a misstep on uneven ground, or a forceful landing with the foot turned outward.
Because the deltoid ligament is strong, medial ankle sprains often involve higher forces than lateral sprains. As a result, they can be associated with other injuries including fractures of the medial malleolus, talar injuries, or syndesmosis sprains. Careful assessment is essential to ensure the injury is truly isolated to the medial ligament complex.
After a medial ankle sprain, swelling and pain can inhibit normal muscle activation around the ankle. This can lead to reduced strength, altered walking patterns, and impaired balance. Without appropriate rehabilitation, these changes can persist even after pain settles, increasing the risk of reinjury or long-term ankle dysfunction.
How Is It Diagnosed?
Diagnosis of a medial ankle sprain is based on a detailed history and physical examination. A physiotherapist will ask about the injury mechanism, pain location, swelling pattern, and ability to weight-bear. Medial tenderness over the deltoid ligament and pain with eversion stress are common findings.
Because medial ankle pain can indicate more serious injury, clinicians carefully screen for fractures using evidence-based tools such as the Ottawa Ankle Rules, and assess for syndesmosis involvement. If red flags are present, imaging is arranged through your GP or emergency department.
Physiotherapists also assess ankle range of motion, strength, balance, and gait. These findings guide both diagnosis and rehabilitation planning, ensuring that recovery targets functional deficits rather than pain alone.
Investigations & Imaging
- X-ray
- Used to rule out fracture of the medial malleolus or other bony injury when clinical criteria are met.
- MRI
- Considered if pain persists, if there is suspicion of associated cartilage injury, or to assess the extent of deltoid ligament injury.
- Ultrasound
- May be used to assess ligament integrity and surrounding soft tissues in selected cases.
Grading / Classification
- Grade I (mild)
- Ligament stretching with minimal swelling and pain. No mechanical instability.
- Grade II (moderate)
- Partial deltoid ligament tear with swelling, bruising, and pain during walking and turning.
- Grade III (severe)
- Complete deltoid ligament rupture with marked swelling and instability, often associated with other injuries.
Physiotherapy Management
Physiotherapy for medial ankle sprain aims to restore normal walking, rebuild ankle stability, and reduce the risk of reinjury. Early management focuses on controlling swelling and pain while encouraging safe, gradual movement.
As symptoms settle, physiotherapy progresses to strengthening, balance training, and functional exercises that prepare the ankle for daily life and sport. Because medial ankle sprains can feel deceptively settled once pain reduces, completing rehabilitation is critical for long-term outcomes.
Exercise
Medial ankle sprain physiotherapy exercises are progressed through stages. Early exercises restore range of motion and gentle strength, including ankle pumps, controlled movements, and isometric holds. As weight-bearing improves, calf strengthening and foot control exercises are prioritised.
Balance and proprioception training are essential, as medial ankle sprains can disrupt joint position sense. Later-stage rehab includes hopping, landing, and change-of-direction drills matched to sport or work demands.
Activity Modification
Activity modification involves reducing high-risk movements early while maintaining general activity. Physiotherapists guide a graded return to walking, then running and sport, ensuring loads increase in a controlled way without repeated flare-ups.
Manual Therapy
Manual therapy may be used to improve ankle mobility, particularly if swelling and stiffness limit dorsiflexion. Joint mobilisation and soft tissue techniques can help restore normal movement patterns and support exercise progression.
Bracing & Taping
Bracing or taping can provide support and confidence during walking and early return to sport. These supports are used alongside, not instead of, strengthening and balance rehabilitation.
Heat & Ice
Ice and compression are commonly used early to manage swelling. Heat may be useful later if stiffness and muscle guarding persist.
Education
Education focuses on understanding the injury, safe loading levels, and the importance of completing rehabilitation even when pain improves. This reduces reinjury risk and supports confident return to activity.
Other
Other components include return-to-sport planning, footwear advice, and addressing whole-limb strength and control to reduce stress on the ankle.
Other Treatments
Other treatments may include short-term immobilisation for more severe injuries, medication for pain management, and imaging-guided assessment when recovery does not follow expected timeframes.
Surgery
Surgery is rarely required for isolated medial ankle sprains. It may be considered if there is persistent instability, associated fractures, or failure to improve with comprehensive conservative management. Physiotherapy is essential both before and after any surgical intervention.
Prognosis & Return to Activity
The prognosis for medial ankle sprain is generally good with appropriate management. Mild injuries may recover within weeks, while more severe sprains require longer rehabilitation. Completing physiotherapy significantly reduces the risk of chronic pain and instability.
Complications
- Persistent ankle pain or swelling if rehabilitation is incomplete.
- Chronic ankle instability or reduced confidence with sport.
- Missed associated injuries such as fractures or cartilage damage.
Preventing Recurrence
- Complete a full balance and strengthening program after any ankle sprain.
- Use bracing or taping during higher-risk sport phases if recommended.
- Maintain ankle dorsiflexion and calf strength to support safe landing mechanics.
- Progress training loads gradually rather than returning abruptly to full activity.
When to See a Physio
- You cannot weight-bear or have severe medial ankle pain after injury.
- There is significant swelling, deformity, or bony tenderness.
- Pain is not improving after 7 to 14 days.
- You have repeated ankle sprains or ongoing instability.
- You need guidance for safe return to sport or work.