Medically Reviewed | Dr. Tom Biernacki, DPM | Board-Certified Podiatrist | Balance Foot & Ankle, Michigan | 5,000+ patients/year
Quick answer: The deltoid ligament is the strong medial ankle ligament. Sprains cause inner ankle pain, swelling, and bruising after an eversion (outward twist) injury. Most deltoid sprains heal with conservative care, but complete tears may require surgery to prevent chronic ankle instability.
The Deltoid Ligament Complex
The deltoid ligament is a strong, fan-shaped medial ankle ligament with superficial and deep layers. It resists eversion (outward rolling) and external rotation of the ankle. Because it is so strong, isolated deltoid sprains are less common than lateral ankle sprains — they usually require a significant eversion force or occur alongside ankle fractures (particularly fibula fractures).
Mechanism of Injury
Eversion ankle sprains (ankle rolls outward rather than inward), pronation injuries in sports, landing awkwardly, and motor vehicle accidents. Associated with syndesmotic injuries, bimalleolar fractures, and Maisonneuve fractures.
Symptoms
Medial ankle pain and tenderness, swelling over the inner ankle, bruising, difficulty bearing weight, and a feeling of instability. The pain is on the inside of the ankle — opposite to the much more common lateral ankle sprain.
Grading
Grade I: Ligament stretch, intact fibers, minimal swelling. Grade II: Partial tear, moderate swelling and bruising, some instability. Grade III: Complete tear, significant instability, often with associated fractures.
Diagnosis
X-rays rule out associated fractures (medial malleolus, fibula, Maisonneuve). Stress X-rays show medial ankle gapping with Grade III tears. MRI best characterizes the ligament tear extent and associated injuries.
Treatment
Grade I–II: RICE, functional rehabilitation, progressive weight-bearing in a brace over 4–8 weeks. Grade III isolated: Often managed conservatively in a boot or cast for 6–8 weeks; surgical repair considered for athletes or persistent instability. Grade III with fracture: Fracture fixation usually stabilizes the deltoid — isolated deltoid repair at the time of fracture fixation is done selectively.
FAQs
Is a deltoid ligament sprain worse than a lateral sprain? Grade for grade, deltoid sprains tend to take longer to heal due to the increased load on the medial ankle. Complete deltoid tears require careful management to prevent chronic valgus ankle instability.
Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.
- Diagnosis and Treatment of Plantar Fasciitis (PubMed / AAFP)
- Heel Pain (APMA)
- Hallux Valgus (Bunions): Evaluation and Management (PubMed)
- Bunions (Mayo Clinic)
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