A New Compression Design that Increases Proximal Locking Screw Bending Resistance in Femur Compression Nails

Our aim is to present our new method of compression, a compression tube instead of conventional compression screw and to investigate the difference of proximal locking screw bending resistance between compression screw application (6 mm wide contact) and compression tube (two contact points with 13 mm gap) application. We formed six  groups each consisting of 10  proximal locking screws. On metal cylinder representing lesser trochanter level, we performed 3-point bending tests with compression screw and with compression tube. We determined the yield points of the screws in 3-point bending tests using an axial compression testing machine. We determined the yield point of 5mm screws as 1963± 53 N (mean±SD) with compression screw, and as 2929±140 N with compression tubes. We found 51 % more locking screw bending resistance with compression tube than with compression screw (p=0,000). Therefore compression tubes instead of compression screw must be preferred at femur compression nails

Biomechanical comparison of three-point bending resistance of titanium and stainless steel locking screws in intramedullary nails

Objectives: This study aims to investigate whether there is any significant difference in bending resistance between titanium and stainless steel locking screws of femur nails and to review deformation of locking screws which is a common problem in interlocking nailing

Reliability of threaded locking screws

Objective: A frequent problem for interlocking nailing that affects the treatment of the fracture is locking screw deformation. The aim of this study is to determine whether bending resistance is different between high, low, and unthreaded locking screws of interlocking femoral nails

Triggering of the finger at the wrist due to a leiomyoma arising from the lumbrical muscle of the middle finger

WOS: 000342776000015PubMed ID: 2339015

Biomechanical Comparison of Fracture Site Stability of Femoral Nails after Fracture Site Resorption

After fracture site resorption, instability increases. We aimed to compare fracture site stability of different femoral nails after fracture site resorption. Thirty composite femurs, divided into three groups of tens for interlocking nails, compression nails and newly designed compressive anti-rotation (CAROT) nails. Using axial compression-distraction and custom made torsion machines, fracture site rotational and axial stabilities after 1 mm fracture site resorption were determined. Between 6 Nm external and 6 Nm internal rotation torques, means of maximum fracture site rotation arc of motion were 5.94 mm in compression, 5.9 mm in interlocking nails and 3.5 mm in CAROT nails. Between 2300 N compression and 150 N distraction forces, means of fracture site axial motion were 3.15 mm for interlocking nail and 1.26 mm for both CAROT nails and compressions nails. CAROT nails are superior to compression nails and interlocking nails regarding fracture site rotational and axial stability after 1 mm fracture site resorption.