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Spring Ligament (Calcaneonavicular Ligament) Laxity
Anatomy: The Spring Ligament is a strong, thick ligament which covers part of the articular surface of the talar head. It is attached to the (1) anterior border of the sustentaculum tali and (2) plantar surface of the navicular.
Function: The Spring Ligament helps maintain the inner longitudinal arch by supporting the head of the talus. Laxity of the Spring Ligament (as occurs in Ehlers-Danlos Syndrome and Marfan Sydrome) can result in a forward, downward and inward displacement of the talar head (See Fluoroscopy Below).
Fluoroscopy of the Rearfoot. Laxity of the spring ligament predisposes the head of the talus to slip downward and forward. This can result in the partial or total collapse of the inner longitudinal arch.
Laxity of the Spring Ligament can result in a functional flatfoot (See Xray below), similar to what we see in the PreClinical Clubfoot Deformity. (Grading Ligamentous Laxity - See the Beightons Score)
X-Ray of the foot in which the inner longitudinal arch has collapsed due to severe laxity of the Spring Ligament
Reference:
Rothbart BA 1974. Flexible Vertical Talus Syndrome: Its Relationship to Talipes Equinus, Journal American Podiatric Medical Association, 64(9):697-700.
Prof/Dr Brian A Rothbart
Chronic Pain Elimination Specialist
Discovered the Rothbarts Foot Structure and the PreClinical Clubfoot Deformity
Developer of Rothbart Proprioceptive Therapy
Inventor and Designer of Rothbart Proprioceptive Insoles
Founder of International Academy of Rothbart Proprioceptive Therapy
Author of Forever Free From Chronic Pain
