A frozen shoulder can be classified in to a primary and secondary condition. The primary is known as a onset of idiopathic origin. The secondary has a more specific cause, such as diabetes or a rotator cuff disease. The duration varies from 1 to 3.5 years. 

The aim of this study was to create a summary of all the literature available regarding a frozen shoulder.

This article highlights the role of the anterior shoulder structures in a frozen shoulder, however the understanding of the pathofysiology remains unclear. Further research is necessary to understand the condition.