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Penetration test curves with penetration strength from 6 different locations of a humeral head specimen from a 65-year-old male. The level markers indicate consecutive 1 mm depth intervals below the subchondral plate. Note that maximum strength is connected with the subchondral plate. Note also the rapid decline in bone strength below the subchondral plate. Locations 2 and 3 represent the center of the humeral head
