Abstract
Patients suffering from severe head injury and fractures of long bones or large joints often show enhanced osteogenesis, with hypertrophic callus formation and/or heterotopic ossifications. The advantage of this phenomenon is early consolidation of the fractures. An extreme disadvantage is extensive periarticular calcification, resulting in complete ankylosis of the affected joint. In spite of numerous efforts aimed at clarifying the way in which severe head injury can influence osteogenesis at a distant site, this phenmenon is still not understood. The process, once started seems irreversible, but if diagnosed in time, could be prevented with non-steroid anti-inflammatory drugs that inhibit development of heterotopic ossifications. The major prerequisite for testing this possibility is to define parameters of an early diagnosis of enhanced osteogenesis. Thus, the aim of this study was to test whether serum values of some parameters related to bone regeneration could allow an early prediction of enhanced ossification following bone fracture in patients with severe head injury. Samples of sera were obtained from three groups of injured patients: fractures of long bones or large joints only (n=6), severe head injury only (n=8), severe head injury and fractures of long bones and large joints (n=7) and from a group of apparently healthy volunteers (n=10). The values for alkaline phosphatase (ALP), the bone isoenzyme, and the carboxy terminal propeptide of type I procollagen (PICP) were significantly higher (5–20 times as high) in patients with severe head injury and bone or joint fractures than in any other group. Significantly increased concentrations of PICP were already found in the 1st week after injury, and those of ALP and of the bone isoenzyme increased during the 2nd week after injury. Results show that these parameters are helpful for an early diagnosis of enhanced osteogenesis and heterotopic ossifications in patients with severe head injury and bone fractures. Further studies are necessary to verify these findings, while analysis of reasons for the specific patterns of dynamic change of these parameters could lead to better understanding of the mechanisms underlying the uncontrolled bone formation.
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Wildburger, R., Zarkovic, N., Dobnig, H. et al. Post-traumatic dynamic change of carboxyterminal propeptide of type I procollagen, alkaline phosphatase and its isoenzymes as predictors for enhanced osteogenesis in patients with severe head injury. Res. Exp. Med. 194, 247–259 (1994). https://doi.org/10.1007/BF02576386
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DOI: https://doi.org/10.1007/BF02576386