Sacrospinous diameter

 

This is a clinical pelvimetric dimension which is obtained when two fingers of approximately 2cm each are insinuated between the ischial spine laterally and the lateral wall of the sacrum medially on pelvic examination. If they fit the two fingers it is then at least 4cm. If they do not, it means the sacrospinous diameter is less than 4cm and therefore presupposes contraction of pelvic dimensions in the midcavity.

 

 

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