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"In a 2 to 12 year follow-up of 125 patients,[1] pain, functioning, and activity measures improved in 82% of patients. Eighteen of the 125 patients (14.4%) were considered failures. Histologically, 42 of 66 (63.6%) of biopsies showed strong evidence of replacement of their articular surface, and 18 of 66 biopsies (27.3%) showed development of normal looking hyaline cartilage.[citation needed]
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