Talocalcaneal Coalition

Lee MR Chan PT, Chau LF et al (2002) Tarsal tunnel syndrome caused by talocalcaneal coalition. Clin Imaging 26 140-143 Leekam RN, Voorneveld CR (1996) Synovial osteochondromatosis of the distal radioulnar joint ultrasound diagnosis. J Clin Ultrasound 24 207-208... 

US examination is best performed with the patient seated on the examination bed with the extremities in a frog-leg position. This position allows coronal scans to be obtained over the medial subtalar joint and comparison of the right and left side in an easy and confident way. The main US landmarks to identify the medial subtalar joint space are the tip of the medial malleolus, the sustentaculum tali and the flexor hallucis longus tendon which courses caudal to it. US demonstrates the normal joint line as a well-defined break in the cortical surface between the talus and the calcaneus (Fig. 19.16a,b). Whatever the nature of the abnormal bridging in talocalcaneal coalitions, either fibrous or chondral or osseous in nature, US is able to reveal marked narrowing (fibrous or chondral coalition) or closure (osseous coalition) of the medial joint space, a feature that is often associated with prominence and deformity... 

Herneth AM, Siegmeth A, Bader TR et al (2001) Scaphoid fractures evaluation with high-spatial-resolution US initial results. Radiology 220 231-235 Herzenberg JE, Goldner JL, Martinez S et al (1986) Computerized tomography of talocalcaneal tarsal coalition. Foot Ankle 6 273-288... 

Congenital tarsal coalition is a fairly common disorder affecting approximately 1% of people with the onset of symptoms in the second decade of life. It is related to an abnormal union between two bones of the hind- and midfoot, causing restricted normal subtalar motion, flatfoot deformity, pain and other disturbances (Newman and Newberg 2000). The most commonly involved joints are the talocalcaneal and the calcaneonavicular, fusion at other sites (i.e., calcaneocuboid, cubonavicular) being... 

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