Objectives. A successful outcome following treatment of nonunion requires the correct identification of all of the underlying cause(s) and addressing them appropriately. The aim of this study was to assess the distribution and frequency of causative factors in a consecutive cohort of nonunion patients in order to optimise the management strategy for individual patients presenting with nonunion. Methods. Causes of the nonunion were divided into four categories: mechanical; infection; dead bone with a gap; and host. Prospective and retrospective data of 100 consecutive patients who had undergone surgery for long bone fracture nonunion were analysed. Results. A total of 31% of patients had a single attributable cause, 55% had two causes, 14% had three causes and 1% had all four. Of those (31%) with only a single attributable cause, half were due to a mechanical factor and a quarter had dead bone with a gap. Mechanical causation was found in 59% of all patients, dead bone and a gap was present in 47%, host factors in 43% and infection was a causative factor in 38% of patients. In all, three of 58 patients (5%) thought to be aseptic and two of nine (22%) suspected of possible infection were found to be infected. A total of 100% of previously treated patients no longer considered to have ongoing infection, had multiple positive microbiology results. Conclusion. Two thirds of patients had multiple contributing factors for their nonunion and 5% had entirely unexpected infection. This study highlights the importance of identifying all of the aetiological factors and routinely testing tissue for infection in treating nonunion. It raises key points regarding the inadequacy of a purely radiographic nonunion classification system and the variety of different definitions for atrophic nonunion in the current mainstream classifications used for nonunion. Cite this article: L. Mills, J. Tsang, G. Hopper, G. Keenan, A. H. R. W. Simpson. The multifactorial aetiology of
We investigated the fracture-free survival of long bones stabilised by a telescopic intramedullary rod (TIMR) in patients with osteogenesis imperfecta with respect to the remodelling status of
A series of 103 acute
We compared the long-term outcome in 61 patients (62 fractures) treated operatively or conservatively for an acute
Over the past 40 years, the management of displaced
Aims. A pragmatic multicentre randomised controlled trial (PROFHER)
was conducted in United Kingdom National Health Service (NHS) hospitals
to evaluate the clinical effectiveness and cost effectiveness of
surgery compared with non-surgical treatment for displaced fractures
of the proximal humerus involving the surgical neck in adults. . Methods. A cost utility analysis from the NHS perspective was performed.
Differences between surgical and non-surgical treatment groups in
costs and quality adjusted life years (QALYs) at two years were
used to derive an estimate of the cost effectiveness of surgery
using regression methods. . Results. Patients randomised to receive surgical intervention accumulated
mean greater costs and marginally lower QALYs than patients randomised
to non-surgery. The surgical intervention cost a mean of £1758 more
per patient (95% confidence intervals (CI) £1126 to £2389). Total
QALYs for the surgical group were smaller than those for non-surgery -0.0101
(95% CI -0.13 to 0.11). The probability of surgery being cost effective
was less than 10% given the current NICE willingness to pay at a
threshold of £20 000 for an additional QALY. The results were robust
to sensitivity analyses. Discussion. The results suggest that current surgical treatment is not cost
effective for the majority of displaced
We undertook a retrospective case-control study
to assess the clinical variables associated with infections in open
Objectives. Secondary fracture healing is strongly influenced by the stiffness of the bone-fixator system. Biomechanical tests are extensively used to investigate stiffness and strength of fixation devices. The stiffness values reported in the literature for locked plating, however, vary by three orders of magnitude. The aim of this study was to examine the influence that the method of restraint and load application has on the stiffness produced, the strain distribution within the bone, and the stresses in the implant for locking plate constructs. Methods. Synthetic composite bones were used to evaluate experimentally the influence of four different methods of loading and restraining specimens, all used in recent previous studies. Two plate types and three screw arrangements were also evaluated for each loading scenario. Computational models were also developed and validated using the experimental tests. Results. The method of loading was found to affect the gap stiffness strongly (by up to six times) but also the magnitude of the plate stress and the location and magnitude of strains at the bone-screw interface. Conclusions. This study demonstrates that the method of loading is responsible for much of the difference in reported stiffness values in the literature. It also shows that previous contradictory findings, such as the influence of working length and very large differences in failure loads, can be readily explained by the choice of loading condition. Cite this article: A. MacLeod, A. H. R. W. Simpson, P. Pankaj. Experimental and numerical investigation into the influence of loading conditions in biomechanical testing of locking plate
We have carried out a retrospective review of 20 patients with segmental
We compared the results of primary ultrasonographic examination of 163 children with 224 suspected
Fractures of the occipital condyle are rare. Their prompt diagnosis is crucial since there may be associated cranial nerve palsies and cervical spinal instability. The
There have been recent reports linking alendronate and a specific pattern of subtrochanteric insufficiency
Aims. A
The osteoinductive properties of demineralised
bone matrix have been demonstrated in animal studies. However, its therapeutic
efficacy has yet to be proven in humans. The clinical properties
of AlloMatrix, an injectable calcium-based demineralised bone matrix
allograft, were studied in a prospective randomised study of 50
patients with an isolated unstable distal radial
Between 1992 and 2000, 57 patients with 57 isolated
We performed dynamic MRI of the femoral head within 48 hours of injury on 22 patients with subcapital
Aim. The aim of this study was to compare the cost-effectiveness of
intramedullary nail fixation and ‘locking’ plate fixation in the
treatment of extra-articular
Flexible intramedullary nailing is gaining popularity as an effective method of treating long-bone
Between 1996 and 2003 six institutions in the United States and France contributed a consecutive series of 234