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Frieberg’s Infraction

• Usually head of 2^nd metatarsal

• But may affect other metatarsal heads as well

• Women to men by 4:1

• Possibly because of shoes

• Usually adolescents

• Clinical

• Local pain and tenderness

• Typical changes of avascular necrosis occur

• End result is flattening of head

• May produce “loose body”

• Other named avascular necroses:

• Keinbocks-carpal lunate

• Kohlers- tarsal navicular

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