Arthroscopic knots: Suture and knot characterisation of modern polyblend suture materials.

Objective: The primary aim of this study was to explore the relationship between the biophysical structure and function of modern suture materials. Particularly the suture's ability to withstand the stressors of surgery and how the material properties affect knot stability. The secondary aim was to investigate the effect that different knots have on the suture material itself. This study builds on previous research assessing suture and knot characteristics but in modern Ultra High Molecular Weight Polyethylene (UHMWPE) materials currently in widespread clinical use in arthroscopic surgery. Methods: Three common UHMWPE sutures and one polyester suture were tested in both a dry and wet state using the Geelong, Nicky's, Surgeon's and Tautline knots. Tensile strength of knots was tested vertically at a 60 mm/min strain rate and 45 mm gauge length. Sutures were tied through a cannula around two 8 mm diameter circular bollards. Testing was conducted in a controlled environment temperature and humidity environment (20 ± 2 °C, 65 ± 2%). Results: No one knot type was optimal over all suture types. Mean tensile strength in both a dry and wet state and a low coefficient of variation (CV) in tensile strength in a wet state were considered as an indication of suitability. With Ethibond sutures this was the Geelong knot (CV:4.2%). With Orthocord sutures both the Geelong and Tautline knots (CV:4.2% and CV:11.9% respectively). With FiberWire sutures the Nickys and Tautline knots (CV:22.6% and CV:22.5% respectively). With ForceFiber sutures all four knots exhibited similar wet tensile strength with high variability showing that all should perform in a similar way invivo. Conclusions: This study demonstrates a statistically significant three-way interaction between polyblend suture materials, the knot and the environment. This has implications for knot security using the tested sutures in different environments, as one knot may not behave the same under all conditions.

An assessment of burnout in New Zealand orthopaedic resident medical officers.

AIMS: Burnout and fatigue are common in the medical profession. The primary aim was to assess rates of burnout in trainee and non-trainee orthopaedic registrars in New Zealand. A secondary aim was to establish which specific factors are associated with burnout. METHODS: In 2021, a 53-question online survey was sent to New Zealand trainee and non-trainee orthopaedic registrars. The survey included questions addressing demographics, modifiable factors known to lead to burnout, information on respective orthopaedic departments, and how respondents had fared with COVID-19. Registrars also completed the Maslach Burnout Inventory-Human Services Survey for Medical Personnel (MBI-HSS MP), a 22-question validated survey that is designed to assess the frequency and intensity of perceived burnout among medical personnel. RESULTS: Fifty of 62 (80.6%) trainees and 66 of 70 (estimated number) (94.3%) of non-trainees completed the survey. Trainees and non-trainees both exhibited moderate levels of burnout. The trainee mean score emotional exhaustion (EE) 22.5, depersonalisation (DP) 8.8, personal achievement (PA) 35.9; non-trainee mean score EE 22.4, DP 8.9, PA 35.9. Fifty-two point two percent of trainees and 50% of non-trainees scored in the severe range for at least one of EE or DP. Factors shown to reduce burnout are the presence of a senior colleague (P<0.001), participation in professional assistance (P=0.049), working in a department with a full complement of staff (P=0.020) and being able to attend health maintenance appointments (P=0.050). CONCLUSION: Our study shows that approximately half of both trainee and non-trainee orthopaedic registrars are exhibiting signs of burnout. This is comparable to other developed nations with a similar healthcare system.

Mobile task management tool that improves workflow of an acute general surgical service.

BACKGROUND: Understanding and being able to measure constraints within a health system is crucial if outcomes are to be improved. Current systems lack the ability to capture decision making with regard to tasks performed within a patient journey. The aim of this study was to assess the impact of a mobile task management tool on clinical workflow within an acute general surgical service by analysing data capture and usability of the application tool. METHODS: The Cortex iOS application was developed to digitize patient flow and provide real-time visibility over clinical decision making and task performance. Study outcomes measured were workflow data capture for patient and staff events. Usability was assessed using an electronic survey. RESULTS: There were 449 unique patient journeys tracked with a total of 3072 patient events recorded. The results repository was accessed 7792 times. The participants reported that the application sped up decision making, reduced redundancy of work and improved team communication. The mode of the estimated time the application saved participants was 5-9 min/h of work. Of the 14 respondents, nine discarded their analogue methods of tracking tasks by the end of the study period. CONCLUSION: The introduction of a mobile task management system improved the working efficiency of junior clinical staff. The application allowed capture of data not previously available to hospital systems. In the future, such data will contribute to the accurate mapping of patient journeys through the health system.

Bending and abrasion fatigue of common suture materials used in arthroscopic and open orthopedic surgery.

In orthopedic surgery, the reattachment of tendon to bone requires suture materials that have stable and durable properties to allow time for healing at the tendon-bone interface. The suture, not rigidly restrained within the anchor eyelet, is free to move during surgery and potentially after surgery with limb motion. During such movement, the suture is subjected to bending and frictional forces that can lead to fatigue-induced failure. We investigated some common contemporary commercial number-two-grade suture materials and evaluated their resistance to bending abrasion fatigue and the consequent failure. Sutures were oscillated over a stainless steel wire at low frequency under load. Number of abrasion cycles to failure, changes in suture morphology, and fatigue-failure method was recorded for each material. Suture structure had a significant effect on abrasion resistance, with braided sutures containing large numbers of fine high tenacity core filaments performing 15-20 times better than other braided suture structures. Ultra high molecular weight polyethylene (UHMWPE) core filaments resisted bending abrasion failure better than other core materials due to the load spreading and abrasion resistance of these filaments. Sutures with UHMWPE cores also had high resistance to tensile failure. Limited correlation was observed between tensile strength and abrasion resistance.