Distal humerus cortical strains following total elbow arthroplasty.

The aseptic loosening of total elbow replacements is a serious complication resulting in significant patient morbidity. It is thought to occur secondary to stress shielding of the distal humeral cortex by the stiff stem of the implant. Some total elbow prostheses incorporate an anterior flange intended to improve implant stability and peri-articular load transfer in an attempt to reduce this effect However, few studies have directly assessed the changes in cortical strains following total elbow arthroplasty or the biomechanical advantage of the anterior flange design. A regular and a long flange Coonrad-Morrey total elbow prosthesis were implanted into six Sawbone synthetic humeri. The constructs were subjected to physiological loads in axial compression (500 N), antero-posterior bending (50 N) and antero-posterior compression with condylar supports (300 N). Digital image correlation was used to measure the distal antero-lateral cortical strains and the results compared with those of whole Sawbones that had been tested in the same way. Significant stress shielding was demonstrated over the distal humeral cortex following prosthesis implantation during axial compression. In contrast, cortical strains increased following prosthesis implantation during antero-posterior compression with condylar supports. The increase in cortical strains following total elbow arthroplasty may help to maintain the integrity of the anterior cortex offering additional stability for implants with an anterior flange. These results are important for the development of future total elbow prosthesis designs and indicate that simulating the action of the forearm muscles is essential when evaluating changes in strain about the distal humerus in vitro.

The "COVID-19 Approach" to Distal Radius Fracture Management.

Background In response to the coronavirus pandemic the British Orthopaedic Association Standards for Trauma and Orthopaedics (BOAST) guidelines advised treating distal radius fractures (DRFs) non-operatively where possible. Questions/Purpose The aim of this study was to assess whether the coronavirus disease 2019 (COVID-19) pandemic lockdown within the United Kingdom did alter the management of DRFs and whether there was any subsequent change in patient outcome or complication rate. Patients and Methods A retrospective cohort study was performed at a single orthopaedic center within the United Kingdom. The cohort of patients presenting with DRFs during the first lockdown was identified through the virtual fracture clinic database. The cohort of patients from the previous year was also identified for comparison. Data was collected on patient demographics, radiological features of the fractures, management, patient outcome and subsequent complications. Comparisons were then made between the cohorts for each year. Results The pre-COVID cohort had a significantly higher number of patients reviewed in face-to-face clinic appointments ( p = 0.0044) and the mean number of clinic appointments for those patients was significantly higher ( p = 0.0149). There was no significant difference between the cohorts regarding patient complications or any need for return to theater with a minimum 10 month follow-up period. Conclusion Despite comparative numbers and patterns of DRFs as well as no significant difference in the number of injuries requiring orthopaedic intervention, the burden on fracture clinic services was significantly reduced during the COVID pandemic. Encouragingly, this reduction in follow-up has not translated into an increased prevalence of complications or requirement for further surgery. Level of Evidence The level of evidence of the study is level III.

Types, management and complications in paediatric distal radial fractures sustained during COVID-19 lockdown.

In response to the coronavirus pandemic the British Orthopaedic Association Standards for Trauma and Orthopaedics (BOAST) guidelines advised treating distal radial fractures non-operatively where possible. A cohort was studied retrospectively to assess whether the COVID pandemic lockdown within the UK altered types, the management and complications of paediatric distal radial fractures. The cohort studied comprised of 194 paediatric distal radial fractures in the pre-COVID cohort and 101 fractures in the COVID cohort. There was no significant differences in the type of fractures in the two cohorts. Significantly more high energy injuries were sustained among the COVID cohort than the pre-COVID (p < 0.001). The COVID cohort had significantly more patients managed in cast (p < 0.001) and significantly more managed with K-wire fixation (p = 0.049). The COVID cohort had significantly more complications (p = 0.016) at minimum 10-month follow-up. The results suggest that treatment of paediatric distal radial fractures during lockdown was too conservative and subsequent complications may put additional strain on orthopaedic services.Level of evidence: IV.

The effects of injection of bovine vaccine into a human digit: a case report.

BACKGROUND: The incidence of needlestick injuries in farmers and veterinary surgeons is significant and the consequences of such an injection can be serious. CASE PRESENTATION: We report accidental injection of bovine vaccine into the base of the little finger. This resulted in increased pressure in the flexor sheath causing signs and symptoms of ischemia. Amputation of the digit was required despite repeated surgical debridement and decompression. CONCLUSION: There have been previous reports of injection of oil-based vaccines into the human hand resulting in granulomatous inflammation or sterile abscess and causing morbidity and tissue loss. Self-injection with veterinary vaccines is an occupational hazard for farmers and veterinary surgeons. Injection of vaccine into a closed compartment such as the human finger can have serious sequelae including loss of the injected digit. These injuries are not to be underestimated. Early debridement and irrigation of the injected area with decompression is likely to give the best outcome. Frequent review is necessary after the first procedure because repeat operations may be required.

Benign palmar schwannoma - a rare case in a handball player.

Peripheral nerve sheath tumours (PNSTs) of the hand are rare. Schwannomas, also known as neurilemmomas, are the commonest benign PNSTs. They arise from a proliferation of Schwann cells. Aetiology is unclear. In this report, the authors present the case of a lifelong Rugby Fives (a handball variant) player who developed a symptomatic benign schwannoma at the impact point on his palm. To our knowledge, there are no documented cases of upper limb schwannomas which may be related to repetitive trauma from sport.