Two-slice-touch rule (knee MRI)

Dr Daniel J Bell and Dr Henry Knipe et al.

The two-slice-touch rule is a sign on MRI of the knee used to increase the sensitivity of diagnosing meniscal tears.

This rule states a meniscal tear is present if abnormal findings are present on two or more images - these do not have to be contiguous, e.g. can occur on sagittal and coronal slices but at the same anatomical location. The only exception to this rule applies to a meniscal root tear, for which abnormal signal in only one slice is considered highly specific for an underlying tear. A possible meniscal tear is present if abnormal findings are present on only one slice in other types of meniscal tear. 

Knee pathology

The knee is a complex synovial joint that can be affected by a range of pathologies:

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Article information

rID: 32949
Section: Signs
Synonyms or Alternate Spellings:
  • Two-slice-touch rule

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