Retrospective Analysis of the Effects of Perioperative Osteoanabolic Treatment on Patients With Spinal (Fusion) Surgery.

Data collection: Bone turnover laboratory parameters: alkaline phosphatase (AP), calcium (corrected for albumin), PTH, Calcidiol (25-OH-D3), N-terminales Kollagen Typ 1 -. Propeptid (P1NP), glomerular filtration rate (GFR), calcium/creatinine (in urine); Radiologic diagnostics: Bone densitometry (DEXA), X-rays, computer tomograms, MRI for analysis of time of the bone healing (or a non-union); Patient data taken from existing medical charts: side effects, tolerability of PTH, patient compliance, presence of previous illnesses as risk factors for the formation of pseudoarthrosis, indication for therapy, time at which therapy started and length of therapy with PTH, precise characterization of the operation (type and whether it is a revision or first operation).