Mueller Weiss syndrome (staging)
Mueller Weiss syndrome refers to a spontaneous adult onset osteonecrosis of the tarsal navicular. This syndrome is multifactorial and related to chronic loading on a suboptimally ossified navicular bone which is susceptible to central osteonecrosis due to its centripetal blood supply. It is distinct from Köhler disease, the osteochondrosis of the tarsal navicular bone that occurs in children.
- stage 1: normal radiographs but subtle subtalar varus deformity may be present because of lateral displacement of the talar head which can cause an overlap with the anterior calcaneal process
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