Purpose of the study

The aim of this study was to prospectively study the safety, functional outcomes and complications of all patients undergoing bilateral single-stage sequential (BSSS) unicompartmental knee arthroplasty (UKA) in our unit.

An anaesthetist recently remarked that orthopaedic surgeons are ‘twice as strong as an ox but half as smart’. We set out to ascertain if this had any evidence basis by conducting an observational study.

We compared 36 male orthopaedic surgeons to 40 male anaesthetists across 3 hospitals to ascertain if there was a significant difference between the two groups in terms of Intelligence Quotient (IQ) and strength. We tested the IQ of each doctor using an official MENSA IQ test. We assessed the strength as reflected by the grip strength using a hand-grip dynamometer. Un-paired t-tests were used to assess statistical significance.

Orthopaedic surgeons had a significantly greater mean grip strength 47.25Kg (SD=6.95) compared to anaesthetists 43.83Kg (SD=7.57) (p=0.04). The mean IQ of orthopaedic surgeons was also significantly greater at 105.19 (SD=10.85) than anaesthetists at 98.38 (SD=14.45) (p=0.02). Furthermore, the IQ of orthopaedic surgeons seems to increase with increasing age and seniority (an IQ jump of 5 IQ points from Registrar to Consultant).

We have concluded that this proverb should be revised to orthopaedic surgeons are as strong as an ox and twice as smart, although further studies are advocated to ascertain the IQ of Ox.

Despite a lack of evidence, the UK's Department of Health introduced a policy of ‘Bare below the elbows’ attire to try to reduce the incidence of nosocomial infection. This study investigates the link between attire and hand contamination. A prospective observational study of doctors working in a District General Hospital was performed. The fingertips were imprinted on culture medium, and the resulting growth assessed for number of colony forming units, presence of clinically significant pathogens and multiply resistant organisms. These findings were correlated with attire, grade, gender and specialty. 92 doctors were recruited of which 49 were ‘Bare below the elbows’ compliant and 43 were not. There was no statistically significant difference between those doctors who were ‘bare below the elbows’ and those that were not for either the number of colony forming units (p=1.0), or the presence of significant organisms (p=0.77). No multiply resistant organisms were cultured from doctors' hands. ‘Bare below the elbows’ attire is not related to the degree of contamination on doctors' fingertips or the presence of clinically significant pathogens. Further studies are required to establish whether investment in doctor's uniforms and patient education campaigns are worthwhile.

Introduction: Legislation driven & technology aided reductions in mortality have been documented over the past 10 years for road traffic accidents (RTAs). However many authors have noted an increasing morbidity as a result of serious lower limb injuries. In collaboration with the Transport Research Laboratory (TRL) a 2 stage research programme has been carried out on fresh frozen PHMS lower limbs. This programme, has culminated in a specific series of PMHS tests to reproduce the most disabling lower limb injuries seen in real world accident data. The authors aimed to establish force thresholds for failure (fracture) of the calcaneus, talus and tibial plafond in frontal and frontal offset RTAs. This data is considered essential to support new pan-European legislation for better lower limb protection structures in new motor vehicles which is currently under discussion.

Methods: A 5m bungee driven sled test facility capable of creating a validated and repeatable dynamic crash pulse was used to subject 15 PMHS lower limb specimens to, axial impact loading. The pulse was modelled on the accelerometer toe-pan recordings from a full-scale automotive crash test in frontal impact. To represent brake pedal intrusion at an impact velocity of up to 14ms⁻¹, a staggered double impact, delaying application of axial loading was used. Impact loading was achieved via a modelled brake pedal to the mid-foot. All specimens were preloaded through the Achilles tendon and by knee extension to simulate the plantar flexing response seen in the foot & ankle in driving simulator studies. Delaying the application of axial loading after the initial impact and sled deceleration effectively imparts momentum into the specimen, further preloading the foot and ankle and thus increasing pre-impact bracing. Transducer data were recorded using high frequency (20 & 100 KHz) capture systems (K-Trader and Prosig). High-speed cinematography enabled additional kinematic analysis. Each specimen was tested once only. Specimens were selected at random for five impact severity groups. All specimens underwent pre impact BMD evaluation using protocols previously designed for this type of work. Post impact analysis included X-rays and necropsy.

Results: The specimens used varied in BMD and age similar to specimens used in other centres for similar testing. In the 15 final test specimens 8 calcaneal fractures were generated, one with an additional talar neck fracture. Seven specimens did not sustain injury. Measured BMD did not appear to be a useful predictor of load to failure. Peak axial forces ranged from 5KN up to 14kN. Toe pan and foot accelerations up to 200g were generated.

Discussion: This test method appears to predispose the calcaneus to injury. It failed to create either a Pilon fracture or an isolated talus fracture. Previous research investigating axial impact loading have applied a direct impact with varing levels of pre-load. They resulted in a range of injuries and suggested pre-loading reduced injury thresholds for talar and tibial injuries. This has not been our experience.

Conclusions: This data is invaluable, enabling thresholds for legislative car crash testing to be authoritatively stated and incorporated into national and international standards.