Zeitschrift für Orthopädie und Unfallchirurgie
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Low follow-up rates are a limitation of many long-term studies. Studies on patients after surgical treatment of adolescent idiopathic scoliosis (AIS) rarely have follow-up rates that reach 80% after 5 years or 70% after 10 years. While there is general consensus that a high patient drop-out rate will decrease the accuracy of a study, little is known about the characteristics of those patients who have dropped out. The purpose of the present study was to identify patients who were lost to follow-up after surgical correction of AIS and to compare their clinical characteristics to those of patients who were available for follow-up. ⋯ We found significant clinical differences for patients who are lost to follow-up when compared to patients who are available for follow-up. While we are aware of the difficulties in obtaining high follow-up rates for a clinical study, care should be taken in analysing studies with low follow-up rates because results may be skewed.
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The diagnosis and treatment of patellar dislocation is very complex. The aim of this study is to give an overview of the biomechanics of the patellofemoral joint and to point out the latest developments in diagnosis and treatment of patellar dislocation. ⋯ It seems that the predominating factors for patellar dislocation are heterogenic morphology in combination with individual predisposition. Non-surgical treatment is typically recommended for primary patellar dislocation without any osteochondral lesions and in the absence of significant risk factors for redislocation. If surgical treatment is deemed necessary, addressing the essential pathomorphology has become the primary focus.
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Fractures of the radial head and neck are the most common involving the elbow and account for 5 % of all fractures in adult individuals. Due to the complex anatomy and biomechanics of the elbow joint radial head fractures are challenging, particularly the comminuted ones. Detailed knowledge of the complex joint anatomy, biomechanics and operative approaches are indispensable for analysing and building a treatment plan. ⋯ Sophisticated reconstructive efforts with combined screw- and plate-osteosynthesis, partial resection or radial head arthroplasty are needed in comminuted fractures. The purpose of this article is to give a detailed review of the anatomy, biomechanics and fracture mechanism. Clinical examination techniques are displayed and operative approaches as well as the conservative and operative treatment algorithms are illustrated.
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Comparative Study
[Comparative study on the strength of different mechanisms of operation of multidirectionally angle-stable distal radius plates].
Polyaxial angle-stable plating is thought to be particularly beneficial in the management of complex intra-articular fractures of the distal radius. The present study was performed to investigate the strength of polyaxial locking interfaces of distal radius plates. ⋯ The strength of polyaxial interfaces differs between the tested systems. A reduction of ultimate strength is due to increases of screw locking angle. The design of polyaxial locking interfaces should be investigated in human bone models.