Biomechanical analysis of the efficacy of locking plates during cyclic loading in metacarpal fractures.

Purpose: To analyse the biomechanical characteristics of locking plates under cyclic loading compared to a nonlocking plate in a diaphyseal metacarpal fracture.

Methods: Oblique diaphyseal shaft fractures in porcine metacarpal bones were created in a biomechanical fracture model. An anatomical reduction and stabilization with a nonlocking and a comparable locking plate in mono- or bicortical screw fixation followed.

Immunohistochemical and molecular characterization of the human periosteum.

Purpose: The aim of the present study was to characterize the cell of the human periosteum using immunohistological and molecular methods.

Methods: Phenotypic properties and the distribution of the cells within the different layers were investigated with immunohistochemical staining techniques and RT-PCR, focussing on markers for stromal stem cells, osteoblasts, osteoclasts and immune cells.

Results: Immunohistochemical results revealed that all stained cells were located in the cambium layer and that most cells were positive for vimentin.

A locking contoured plate for distal fibular fractures: mechanical evaluation in an osteoporotic bone model using screws of different length.

Osteoporotic bone with poor mechanical capacity provides limited stability after fixation of ankle fractures. Stabilization with an implant providing increased fixation strength in osteoporotic bone could reduce failure rates of fixation and allow a more functional treatment. The purpose of this study was to evaluate a locking contoured plate for fixation of distal fibular fractures in comparison with a conventional contoured plate in an osteoporotic bone model.

Medium-term results after complex intra-articular fractures of the tibial plateau.

Background: To present the medium-term results of intra-articular, bicondylar AO/OTA classification type C fractures of the tibial plateau in a retrospective study at a level-1 trauma center in 22 patients with 23 fractures.

Methods: Demographic data for the patients and details of current clinical and radiological follow-up findings were obtained to assess range of motion, clinical stability and alignment of the knee, and posttraumatic arthrosis (Kellgren/Lawrence score). Functional outcomes were assessed using the Lysholm score, Knee Injury and Osteoarthritis Outcome Score (KOOS), and International Knee Documentation Committee (IKDC) form.

Subtrochanteric femoral fractures: influence of patient age on fracture type and mobility.

Background: To investigate the potential influence of patient age on fracture type and postoperative mobility in subtrochanteric femoral fractures.

Methods: Data for patients who had suffered subtrochanteric femoral fractures between 2004 and 2009 were analyzed in a retrospective single-center study at a level I trauma center. Age, sex, accident cause, fracture type (Seinsheimer, Russell-Taylor, and AO classifications) and mobility at different time points (pre-trauma, after 3, 6, and 12 months, and current) were collected using the patient files, radiographs, and phone enquiries.

Clinical outcome and changes in gait pattern after pilon fractures.

Purpose: Axial burst fractures of the distal tibia are challenging to treat and often lead to restricted function of the lower limb. The purpose of this study was to investigate the clinical outcome and changes in gait pattern in such patients.

Methods: Thirty-five patients in a level 1 trauma centre were followed up clinically and by gait analysis.

Results of dynamic pedobarography following surgically treated intra-articular calcaneal fractures.

Objective: To investigate the clinical outcome and gait analysis findings by dynamic pedobarography in patients following surgically treated single, closed, dislocated intra-articular calcaneal fractures.

Design: Retrospective single-center study with 26 patients. The average follow-up period was 34 months (range 18-61 months).

Biomechanical comparison of the Locking Compression superior anterior clavicle plate with seven and ten hole reconstruction plates in midshaft clavicle fracture stabilisation.

Purpose: The purpose of this study was to characterise the biomechanical properties of the seven hole superior anterior clavicle LCP (locking compression plate) and to compare these with the properties of commonly applied implants used for the stabilisation of clavicular midshaft fractures such as the locking 7- and ten hole reconstruction plate.

Methods: Twenty-four synthetic clavicles were used. A transverse midshaft fracture was induced.

Cysteine-rich matricellular protein improves callus regenerate in a rabbit trauma model.

Purpose: Open fractures with severe soft-tissue trauma are predisposed to poor bone healing. The vital coupling between osteo- and angiogenesis is disturbed. Cysteine-rich protein 61 (CYR61) is an angiogenic inducer promoting vascularisation.

Effective combination of bone substitute and screws in the jail technique: a biomechanical study of tibial depression fractures.

Purpose: The aim of this study was to investigate a new drillable calcium phosphate cement (Norian drillable Synthes GmbH) as a bone substitute either alone or in combination with screws in the jail technique (Petersen et al. Unfallchirurg Mar 109(3):219-234, 2006; Petersen et al. Unfallchirurg Mar 109(3):235-244, 2006) with regard to the primary stability in lateral tibial depression fractures.

Higher stability with locking plates in hand surgery? Biomechanical investigation of the TriLock system in a fracture model.

Purpose: The aim of this study was to determine the biomechanical characteristics of locking plates with the TriLock system with different design and screw settings compared to a non-locking plate in a diaphyseal metacarpal fracture.

Methods: Oblique diaphyseal shaft fractures in porcine metacarpal bones were created in a biomechanical fracture model. After reduction they were fixed with three different locking plates with the TriLock interlocking mechanism or a non-locking linear plate in mono- or bicortical screw fixations.

Simultaneous posterior fracture dislocation of the shoulder following epileptic convulsion.

Shoulder dislocations with fractures are a possible complication of an epileptic seizure and are often missed on the first sight. The incidence of sustaining an avascular humeral head necrosis (AVN) is high, and primary prosthetic replacement is the choice of treatment. In this paper, we describe such a rare case: a 48-year-old male patient sustained simultaneous bilateral posterior shoulder dislocation with fractures of both humeral heads following the first episode of an epileptic convulsion.

A contoured locking plate for distal fibular fractures in osteoporotic bone: a biomechanical cadaver study.

Objective: Fixation of ankle fractures in elderly patients is associated with reduced stability conditioned by osteoporotic bone. Therefore, fixation with implants providing improved biomechanical features could allow a more functional treatment, diminish implant failure and avoid consequences of immobilisation.

Materials And Methods: In the actual study, we evaluated a lateral conventional contoured plate with a locking contoured plate stabilising experimentally induced distal fibular fractures in human cadavers from elderly.