The thoracic facet joint capsules are the fibrous enclosures of the zygapophyseal (facet) joints at each thoracic level, oriented in the coronal plane to allow thoracic rotation while limiting flexion-extension.
Provide the fibrous joint containment of the thoracic facet articulations, resist excessive thoracic rotation beyond the facet orientation allows, and are the capsules involved in thoracic facet arthropathy and injury.
Thoracic facet joint injections target the capsule for diagnostic and therapeutic purposes in thoracic paraspinal pain. The coronal orientation of thoracic facet joints makes them more permissive of rotation than the lumbar sagittal facets, contributing to the thoracic spine's rotational mobility.
Capsular degeneration of thoracic facet joints producing paraspinal thoracic pain reproduced by trunk rotation, managed by medial branch nerve block or facet joint injection.
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