In an attempt to examine the relationship between growth hormone (GH) and periarticular new bone formation (PNBF), we studied eight patients with brain lesions of different origins who were in a prolonged comatose state for 164 to 1320 days. Five of them developed PNBF. The latter reacted to both the specific L-Dopa test and to the non-specific TRH test with an increase in GH serum concentration. Those patients who did not develop PNBF, failed to react significantly to either tests. The difference in GH values between the two groups is statistically significant at the 95% level of confidence. We hypothesize that there may be a causal relationship between high concentrations of GH in serum and PNBF.
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