Fixation techniques used in the treatment of slipped capital femoral epiphysis (SCFE) that allow continued growth of the femoral neck, rather than inducing epiphyseal fusion in situ, have the advantage of allowing remodelling of the deformity. The aims of this study were threefold: to assess whether the Free-Gliding (FG) SCFE screw prevents further slip; to establish whether, in practice, it enables lengthening and gliding; and to determine whether the age of the patient influences the extent of glide. All patients with SCFE who underwent fixation using FG SCFE screws after its introduction at our institution, with minimum three years’ follow-up, were reviewed retrospectively as part of ongoing governance. All pre- and postoperative radiographs were evaluated. The demographics of the patients, the grade of slip, the extent of lengthening of the barrel of the screw and the restoration of Klein’s line were recorded. Subanalysis was performed according to sex and age.Aims
Methods
End caps are intended to prevent nail migration
(push-out) in elastic stable intramedullary nailing. The aim of
this study was to investigate the force at failure with and without
end caps, and whether different insertion angles of nails and end caps
would alter that force at failure. Simulated oblique fractures of the diaphysis were created in
15 artificial paediatric femurs. Titanium Elastic Nails with end
caps were inserted at angles of 45°, 55° and 65° in five specimens
for each angle to create three study groups. Biomechanical testing
was performed with axial compression until failure. An identical
fracture was created in four small adult cadaveric femurs harvested
from two donors (both female, aged 81 and 85 years, height 149 cm and
156 cm, respectively). All femurs were tested without and subsequently
with end caps inserted at 45°. In the artificial femurs, maximum force was not significantly
different between the three groups (p = 0.613). Push-out force was
significantly higher in the cadaveric specimens with the use of
end caps by an up to sixfold load increase (830 N, standard deviation
(SD) 280 These results indicate that the nail and end cap insertion angle
can be varied within 20° without altering construct stability and
that the risk of elastic stable intramedullary nailing push–out
can be effectively reduced by the use of end caps. Cite this article:
The management of children’s fractures has evolved
as a result of better health education, changes in lifestyle, improved
implant technology and the changing expectations of society. This
review focuses on the changes seen in paediatric fractures, including
epidemiology, the increasing problems of obesity, the mechanisms
of injury, non-accidental injuries and litigation. We also examine
the changes in the management of fractures at three specific sites:
the supracondylar humerus, femoral shaft and forearm. There has
been an increasing trend towards surgical stabilisation of these
fractures. The reasons for this are multifactorial, including societal
expectations of a perfect result and reduced hospital stay. Reduced hospital
stay is beneficial to the social, educational and psychological
needs of the child and beneficial to society as a whole, due to
reduced costs. Cite this article:
Elastic stable intramedullary nailing (ESIN)
is generally acknowledged to be the treatment of choice for displaced diaphyseal
femoral fractures in children over the age of three years, although
complication rates of up to 50% are described. Pre-bending the nails
is recommended, but there are no published data to support this.
Using synthetic bones and a standardised simulated fracture, we
performed biomechanical testing to determine the influence on the
stability of the fracture of pre-bending the nails before implantation.
Standard ESIN was performed on 24 synthetic femoral models with
a spiral fracture. In eight cases the nails were inserted without
any pre-bending, in a further eight cases they were pre-bent to
30° and in the last group of eight cases they were pre-bent to 60°. Mechanical
testing revealed that pre-bending to 60° produced a significant
increase in the stiffness or stability of the fracture. Pre-bending
to 60° showed a significant positive influence on the stiffness
compared with unbent nails. Pre-bending to 30° improved stiffness
only slightly. These findings validate the recommendations for pre-bending,
but the degree of pre-bend should exceed 30°. Adopting higher degrees
of pre-bending should improve stability in spiral fractures and
reduce the complications of varus deformity and shortening.
Matrix metalloproteinases (MMPs), responsible
for extracellular matrix remodelling and angiogenesis, might play
a major role in the response of the growth plate to detrimental
loads that lead to overuse injuries in young athletes. In order
to test this hypothesis, human growth plate chondrocytes were subjected
to mechanical forces equal to either physiological loads, near detrimental
or detrimental loads for two hours. In addition, these cells were
exposed to physiological loads for up to 24 hours. Changes in the
expression of MMPs -2, -3 and -13 were investigated. We found that expression of MMPs in cultured human growth plate
chondrocytes increases in a linear manner with increased duration
and intensity of loading. We also showed for the first time that
physiological loads have the same effect on growth plate chondrocytes
over a long period of time as detrimental loads applied for a short
period. These findings confirm the involvement of MMPs in overuse injuries
in children. We suggest that training programmes for immature athletes
should be reconsidered in order to avoid detrimental stresses and
over-expression of MMPs in the growth plate, and especially to avoid
physiological loads becoming detrimental. Cite this article:
