In our study we got most of patients with A3 type unstable fractures
. In PFN group 11 patients (55%), in DHS group 18 patients (56.26) and in PFLCP group 8 patients (80) were with A3 type fractures.
This relationship allows, by testing specimens having a crack depth ranging from 0.2 to 0.7 (a/W), calculation of the critical strain energy release rate [G.sub.IC] for unstable fracture
from the slope of the U vs.
The unstable fracture
toughness decreases from 1.186 MPa * [m.sup.1/2] at room temperature to 0.297 MPa * [m.sup.1/2] at 600[degrees]C, with a significant loss of 0.889 MPa * [m.sup.1/2] or 75%.
Dynamic hip screw osteosynthesis in unstable fractures
was associated to a higher incidence of complications.
It is worth noting that the fracture energy can only represent the amount of average energy dissipation for entire crack propagation from crack initiation to complete failure without characterizing crack stable propagation and unstable fracture
As discussed, the initial reduction of unstable fractures
of the distal radius achieved by closed reduction and Plaster of Paris (POP) cast immobilisation is difficult to maintain with this method alone.
Surgery was indicated for those with an open fracture or those with an inherently unstable fracture
pattern, which was generally defined as those with three of the following: initial dorsal angulation greater than 20[degrees], initial shortening greater than 5 mm, greater than 50% dorsal comminution, intra-articular fracture, age greater than 60, and an associated ulna fracture.
The slope of this relationship defines the critical strain energy release rate [G.sub.c] for unstable fracture
. This assumption cannot be made where similar tests are carried out on materials showing nonlinear-elastic behavior.
Osteosynthesis for the unstable fracture
of the hand.
They theorized that over time with compression of the fracture and dynamization of the nail in the setting of an unstable fracture
pattern there was toggling of the nail within the intramedullary canal which led to the medial migration of the lag screw during repeated axial loading .
Thus the maximum load on the load-displacement diagrams also represents the load at which an unstable fracture
Friese and coworkers (43) performed a retrospective review of 96 patients with pelvic fracture and risk factors for hemorrhage (systolic blood pressure less than 100 mmHg or an unstable fracture
pattern) who underwent a FAST and either operative exploration or CT scan for confirmation.
Conservative management of comminuted unstable fracture
by plaster cast method shows high incidence of unsatisfactory results.
Not uncommonly, debate will arise in the early management of the multiply-injured patient with an unstable fracture
pattern regarding the proper sequence of events.
Rajan, concluded that elastic intramedullary nailing represents an effective and reliable method to treat an unstable fracture
of the tibial diaphysis in the paediatric patient, where conservative management is not appropriate.