A proof of concept study in a spontaneous ligament rupture dog model assessed if the magic angle effect disappears in unhealthy tissue. Ten dogs were scanned using the MADI technique. Standard deviation (SD) maps of signal intensity were computed and measured in an interactive display. Three subjects showed abnormally high SD; two at the ACL origin, one in the trochlear articular cartilage. Fibre orientation maps showed either disorganised or highly organised collagen fibres in these subjects. On dissection two subjects had partially torn ACLs and the other a fibrocartilage lesion. There was excellent correlation between the MADI and dissection findings.
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