Cut-out of the lag screws
were observed in five patients as complication.
Panels showing initial DCS guidewire placement and planning of osteotomy wedge (upper left), positioning of DCS lag screw
with prebent plate (upper right), and anteroposterior (lower left) and lateral (lower right) images of compressed osteotomy site.
The femoral neck fracture was fixed with four partially threaded lag screws
. At two-year follow-up, the patient had returned to full activities with no pain, and radiographs demonstrated preserved joint space with no evidence of AVN.
The most suitable position of the lag screw
was found at the middle position of the TAD (20 mm) and femoral neck (AP, IS=0[degrees]), according to von Mises compression stress values occurring on the fracture line.
Cooper et al., "Comparison of femoral head rotation and varus collapse between a single lag screw
and integrated dual screw intertrochanteric hip fracture fixation device using a cadaveric hemi-pelvis biomechanical model," Journal of Orthopaedic Trauma, vol.
Treatment ranges from close reduction to open reduction with nonrigid fixation, transosseous wires, circum- mandibular wires, AO reconstruction plates;10 mini dynamic compression plates, compression plates,11-12 non compression plates,13 and lag screws
.14 But still angle, so no consensus has been made yet for the ideal treatment modality for angle fracture.
The sliding distance of the lag screw
was <10% in 39 patients (92.86%) and >10% in three patients (7.14%).
Yang, "Anterior or posterior obliquity of the lag screw
in the lateral view-Does it affect the sliding characteristics on unstable trochanteric fractures?" Injury, vol.
In the neutralisation mode, the plate functions to reduce the forces on an inter-fragmentary compression or lag screw
. In the buttress mode, the plate acts to support the fracture fragment, preventing displacement from forces.
Solitary lag screw
osteosynthesis in the treatment of fractures of the angle of the mandible: a retrospective study.
A tricky but better-looking repair is to drive one or two long lag screws
through the base of the post and into the stair framing.
--1/2-inch diameter lag screw
with 15/32-inch wall sheathing between the ledger and band joist,