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Tarsal pseudo-coalition--a positional artifact

H A Shaffer, R B Harrison

Journal of the Canadian Association of Radiologists

|December 1, 1980

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Pseudo-coalition of the talocalcaneal joint is a positional artifact on foot X-rays. It can be distinguished from true coalition by its disappearance on true lateral views and absence of clinical signs.

Area of Science:

Radiology
Orthopedics
Anatomy

Background:

Talocalcaneal coalition can cause foot pain and flatfoot.
Distinguishing pseudo-coalition from true coalition is crucial for diagnosis and treatment.

Purpose of the Study:

To describe the characteristics of pseudo-coalition of the talocalcaneal joint.
To differentiate pseudo-coalition from true talocalcaneal coalition on radiographic imaging.

Main Methods:

Review of lateral foot radiographs.
Identification of positional artifact (pseudo-coalition) versus true bony bridge (coalition).

Main Results:

Pseudo-coalition is an artifact caused by foot abduction or inversion on lateral radiographs.

Related Experiment Videos

It presents as an apparent bony bridge due to overlapping structures.

Key differentiating features include disappearance on true lateral views, absence of talar spurs, and lack of spastic flatfoot.

True medial talocalcaneal bridges require special views and are not visible on standard lateral radiographs.

Conclusions:

Pseudo-coalition is a common radiographic finding that mimics true talocalcaneal coalition.
Radiographic assessment, including true lateral views and evaluation for associated findings, is essential for accurate differentiation.