Journal of Experimental and Clinical SurgeryJournal of Experimental and Clinical Surgery2070-478X2409-143XVoronezh State Medical University5510.18499/2070-478X-2014-7-1-47-53UnknownCriteria of Instability and Their Influence on Clinical and Radiological Parameters of the Distal Radius<span>MD, associate Professor of the chair of traumatology, orthopedics and poly-clinical surgery Samara state medical University.</span>author@vestnik-surgery.com<span>MD, Professor, head of chair of traumatology, Orthopaedics outpatient surgery, and teachers of the Samara state medical University</span>author@vestnik-surgery.com<span>MD., associate Professor of physics of solid and non-equilibrium systems Samara state University</span>author@vestnik-surgery.comSamara State Medical University, 89 Chapaevskaia Str., Samara, 443099, Russian Federation
M.I. Kalinin Regional hospital, 159 Tashkentskaia Str., Samara, 443095, Russian FederationSamara State Medical University, 89 Chapaevskaia Str., Samara, 443099, Russian FederationSamara State University, 1 Akademika Pavlova Str., Samara, 443011, Russian Federation240320147147532604201626042016Copyright © 2014, ., ., .2014The purpose of the study To examined the clinical and radiological (X-ray) parameters of the distal radius with different types of its damages and on this basis to develop and prove the diagnostic value of essentially new fracture instability criteria. Material and methods Clinical and radiological (X-ray) parameters (CRP) of the malunited distal radius (DR) in 129 patients were analysed. Two new criteria of instability (СI) were proposed. A basic significance test was carried out to prove the influence of the Instability Criterion (IC) on Clinical X-ray Index (CXI). Statistical null hypothesis was formulated as follows: “CXI mean value is the same regardless of the IC presence”. Thus, the alternative hypothesis meant that the influence does exist. Twelve twotailed tests were carried out (two IC for six CXIs) using Student’s t-distribution with 127 degrees of freedom for 95% confidence level. Every sampling from population of 129 patients could be certainly normalized. Results and their discussion It is established that the criterion of instability CI–A influences signifi-cantly on radial displacement (RD) of the distal fragment of the distal radius: in the presence of this criterion RD was 4,63 mm and in its absence – 1,19 mm. CI–B influences on the radio–ulnar index (RUI) – 5,23 mm and 3,76 mm accordingly; radial displacement (RD) – 2,88 mm and 1,84 mm accordingly and active room of motion (ROM) of the wrist – 47,38 % accordingly – in the presence of criterion and 53,48 % – in its absence. 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