title: Increased serum OPG in atrophic nonunion shaft fractures.
abstract: BACKGROUND
  Bone repair alteration is hypothesized for nonunion fracture pathogenesis. Since it is involved in osteoclast regulation, the RANK/RANKL/OPG system (receptor activator of nuclear factor kB/its ligand/osteoprotegerin) may play a role.
  
  
  METHODS
  Serum OPG, free RANKL, bone alkaline phosphatase (BAP), osteocalcin (OC), and urinary deoxypyridinoline (DPD) were determined in 16 male patients (20-39 years) with long bone atrophic nonunion fractures. Serum markers were also measured in 18 age-matched male controls who healed from the same type of fractures within six months, and in 14 age-matched male controls who were healing from the same fractures one month after injury. One-way ANOVA and Bonferroni's test were used for statistical analysis.
  
  
  RESULTS
  Only OPG was significantly higher (0.56 sd 0.11 ng/ml) in the patients compared to healed (0.26 sd 0.04 ng/ml; P < 0.001) and healing (0.29 sd 0.09 ng/ml; P < 0.001) controls. The patients' DPD levels were normal. No correlations were found between bone markers and the characteristics of the subjects in all groups.
  
  
  CONCLUSIONS
  A normal steady state of bone metabolism seems to be present in patients with atrophic nonunion fractures, despite the high serum OPG. The reason for the inability of the patients' OPG to inhibit osteoclastic activity is unknown. Osteoblast activity also appears normal, so another cellular source of OPG can be hypothesized.
authors.affiliation: U.O. Medicina Nucleare, Centro per la Diagnosi e la Terapia delle Osteoporosi, Fondazione IRCCS Ospedale Maggiore Policlinico, Mangiagalli e Regina Elena, Via F. Sforza 35, 20122, Milan, Italy.
authors.forename: Daniele
authors.initials: D
authors.lastname: Marchelli
authors.forename: Luca P
authors.initials: LP
authors.lastname: Piodi
authors.forename: Costantino
authors.initials: C
authors.lastname: Corradini
authors.forename: Luca
authors.initials: L
authors.lastname: Parravicini
authors.forename: Cesare
authors.initials: C
authors.lastname: Verdoia
authors.forename: Fabio M
authors.initials: FM
authors.lastname: Ulivieri