The tibiocalcaneal ligament is the strongest band of the superficial deltoid ligament, running nearly vertically from the anterior colliculus of the medial malleolus to the sustentaculum tali of the calcaneus. Because it crosses both the ankle and subtalar joints, it provides key medial support against eversion and hindfoot valgus during the stance phase of walking.
| Origin | Anterior colliculus of the medial malleolus |
|---|---|
| Insertion | Sustentaculum tali of the calcaneus |
The primary medial ankle stabiliser against eversion, providing hindfoot valgus restraint and preventing excessive subtalar eversion during walking and running. It works synergistically with the deep tibiotalar ligament to stabilise the medial mortise.
The tibiocalcaneal ligament is assessed clinically by palpating just below the medial malleolus over the sustentaculum tali. In chronic medial ankle instability and adult-acquired flatfoot, its attenuation allows the calcaneus to evert beneath the talus with progressive hindfoot valgus. Flatfoot reconstruction may combine medial displacement calcaneal osteotomy, spring ligament repair, and deltoid (tibiocalcaneal and tibiospring) reconstruction. Repair of this ligament during calcaneal fracture surgery may be required when the sustentaculum is disrupted.
Attenuation of the tibiocalcaneal and other deltoid components from chronic eversion sprains or inflammatory arthritis produces medial ankle laxity with hindfoot valgus gait pattern, managed with orthotic support, physiotherapy, or deltoid ligament reconstruction for functional instability.
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