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The stabilizing effect of the ligamentous structures in the sinus and canalis tarsi on movements in the hindfoot

An experimental study

Biomechanics Laboratory, Orthopaedic Hospital, University of Aarhus, Aarhus, Denmark

Jon-Oddvar Wethelund, MD

Biomechanics Laboratory, Orthopaedic Hospital, University of Aarhus, Aarhus, Denmark

Peter Helmig, MD

Biomechanics Laboratory, Orthopaedic Hospital, University of Aarhus, Aarhus, Denmark

Kjeld Søballé, MD

Biomechanics Laboratory, Orthopaedic Hospital, University of Aarhus, Aarhus, Denmark

Three-plane kinesiology of hindfoot instability was stud ied after lesions to the ligamentous structures in the sinus and canalis tarsi in 20 amputation specimens. Neither a lesion of the cervical ligament nor of the interosseous talocalcaneal ligament resulted in an in crease in the total range of movements above 2.6° in any of the three planes. However, the percentage in crease in the total range of movements after cutting of the ligaments was generally largest in the talocalcaneal joint compared to the increase in the total hindfoot joint complex. The largest percentage increase (43%) in the talocalcaneal joint occurred at dorsiflexion after cutting the interosseous talocalcaneal ligament.

The demonstrated minor instability after experimental lesions of the ligamentous structures in the sinus and canalis tarsi may have a clinical identity in the sinus tarsi syndrome. Patients with that syndrome rarely present an objective hindfoot instability, although a major complaint is a feeling of hindfoot instability.

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				P. F. Balen and C. A. Helms Association of Posterior Tibial Tendon Injury with Spring Ligament Injury, Sinus Tarsi Abnormality, and Plantar Fasciitis on MR Imaging Am. J. Roentgenol., May 1, 2001; 176(5): 1137 - 1143. [Abstract] [Full Text] [PDF]