“…Previous investigations have shown that the uptake of radioactive calcium, phosphate and strontium around a fracture is the same in normal and delayed union (Karsher 1953, Bohr 1955, Wendeberg 1961 , indicating that the process of mineralization continues despite the failing consolidation. In order to illuminate this question further, the rate of bone formation and bone resorption has been studied in cases of delayed union and pseudarthrosis through microradiographic investigations and the uptake of Tetracyclines at the fracture site.…”