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Orthopaedic Proceedings
Vol. 105-B, Issue SUPP_2 | Pages 114 - 114
10 Feb 2023
Rosser K Ryu J Deo S Flint M
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The NZ Standards of Service Provision for Sarcoma patients were developed by the NZ Sarcoma working group and published by the Ministry of Health (MOH) in 2013. Although not formally enacted by the MOH we aimed to determine the impact of these published standards and referral pathways on disease-specific survival of patients with soft-tissue sarcoma in NZ. The Middlemore Musculoskeletal Tumour Unit database was searched. Patients referred for treatment in our centre with a diagnosis of soft tissue sarcoma in the five-year period before (n=115) and after (n=155) were included. We excluded patients with bone sarcomas and retroperitoneal soft tissue sarcomas. The rate of referral after inappropriate treatment reduced after implementation of the Standards (24% vs 12%, p=0.010). The number of patients referred with tumours larger than 50mm decreased (74.8% vs 72.3%, p=0.021) and fewer had metastases at diagnosis (11.3% vs 3.2%, p=0.017). Mortality was lower in the group after introduction of the Standards (45% vs 30%, p=0.017). The estimated disease-specific survival curve between the two groups shows a trend towards increased survival in the post-standards group, although not reaching statistical significance. Local recurrence rate and metastasis rate after definitive treatment were similar between the two groups. Patients had a shorter duration of symptoms before referral in the post-Standards group although this was not statistically significant. Since implementation of the Standards, patients have been referred more promptly, with fewer inappropriate treatments. The time to mortality curve indicates a trend towards improved disease-specific survival. We conclude that the pathway for investigation and referral for this condition has become clearer, supporting the ongoing use of the Sarcoma Standards, and that these should be formally implemented by the MOH


Orthopaedic Proceedings
Vol. 101-B, Issue SUPP_5 | Pages 79 - 79
1 Apr 2019
Abdelgaied A Fisher J Jennings LM
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Introduction. The number of young and more active patients requiring total knee replacement (TKR) is increasing. Preclinical evaluation and understanding the long-term failure of TKR is therefore important. Preclinical wear simulation of TKR is usually performed according to the International Standards Organization (ISO) recommendations. Two international standards for preclinical wear simulation of TKRs have been developed so that the anterior-posterior (AP) translation and internal-external (IE) rotation can be driven in either force or displacement control. However, the effects of using different control regimes on the kinematics and wear of the same TKR have not been investigated. The current study investigated the kinematics, contact mechanics and wear performance of a TKR when running under ISO force and displacement control standards using an experimentally validated computational model. Materials/Methods. Three different ISO control standards were investigated using a size C Sigma curved TKR (DePuy, UK), with moderately cross-linked UHMWPE curved inserts; ISO-14243-3-2004, ISO-14243-3-2014 and ISO- 14243-1-2009. Axial force and flexion-extension angle are common for the three standards. AP and IE motions are displacement controlled in ISO-14243-3-2004 and ISO-14243-3-2014, with the only difference being a reversal of AP polarity between the two standards, and are force controlled in ISO-14243-1-2009. The test setup and soft tissue constraints were defined in accordance with ISO recommendations. The wear model was based on the modification of Archard's law where the wear volume is defined as a function of contact area, sliding distance, cross-shear and contact stress. The simulation framework has been independently validated against experimental wear rates under three different standard and highly demanding daily activities (Abdelgaied et al. 2018). Results. Reversing AP in the displacement control ISO-2014, compared to ISO-2004, resulted in high contact stresses of more than 70 MPa in the posterior direction. The predicted AP and IE from the force control ISO-2009 were in different directions and magnitudes to ISO-2014 AP and IE. The predicted wear rates were 1.8, 2.0, and 5.5 [mm. 3. /mc] for ISO-14243-3-2004, ISO-14243-3-2014 and ISO-14243-1-2009 respectively. Discussion. Reversing AP in the displacement control ISO-2014, without revising the femoral centre of rotation, resulted in high stress edge loading in the posterior direction, due to femoral rollback, and more than 10% increase in wear rate compared to ISO-2004. The predicted AP and IE from the force control ISO-2009 had different polarities and magnitudes to the corresponding displacement control ISO-2014 AP and IE. In addition, the predicted wear rate under the force control ISO-2009 was more than double that measured under displacement control standards due to the increased AP and IE motions predicted under the force control standard. In addition to the previous validation of the model, the predicted wear rate under the force control ISO-2009 of 5.5 mm. 3. /mc was within the 95% confidence limits of the reported experimental wear rate for the same TKR of 4.71±1.29 mm. 3. /mc (Johnston et al. 2018) which gives more confidence in the model. Conclusion. The study showed significant differences between ISO force and displacement control standards and between ISO displacement standards with different AP polarities. These differences should therefore be considered when choosing a control regime for preclinical simulation of TKR


Orthopaedic Proceedings
Vol. 102-B, Issue SUPP_7 | Pages 48 - 48
1 Jul 2020
Webster G Karmakar-Hore S de Guia N Di Bella J Bohm E Klazinga N Slawomirski L Kallen M
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The Canadian Institute for Health Information (CIHI) and the Organisation for Economic Co-operation and Development (OECD) have partnered to advance international patient-reported outcome measures (PROMs) collection and reporting standards for hip and knee arthroplasty. This project is part of the OECD's Patient-Reported Indicator Survey (PaRIS) initiative, which aims to address the need for internationally comparable patient-reported outcome and experience measures in order to better monitor health system performance and drive continuous improvement. PROMs are in varying stages of implementation across OECD health systems, with differences in collection and reporting practices across existing programs.

CIHI and the OECD are leading an international working group for PROMs in hip and knee replacement surgery in order to build consensus on PROMs data collection standards and develop indicators for international reporting. Working group members include patient representatives, clinicians, national arthroplasty registries, the International Society of Arthroplasty Registries (ISAR), experts in PROMs measurement, and government representatives of several OECD member countries. Activities of the working group focus on two main priorities: 1) Use existing PROMs programs to maximize pilot comparable reporting in OECD's Health at a Glance 2019 report, and 2) Advance new PROMs standards and data collection to maximize comparable reporting beyond Health at a Glance 2019.

An environmental scan of PROMs in hip and knee arthroplasty found that a number of countries are collecting this data, however, there are variations in survey instruments as well as administration and reporting methods within and across countries. As part of priority 1, the working group has achieved consensus on a number of aspects around pilot reporting. The project is compiling data from existing PROMs programs in order to report results in the Health at a Glance 2019 publication.

For priority 2, the most notable challenge is establishing an agreement across countries on common survey tools, as well as a minimum data set that works for all, given the disparities of existing collection across countries. Many international programs lack the flexibility to change PROMs tools or collections methods, and have concerns regarding the break in trend for PROMs data within their own countries if they were to change methods. The project is exploring the use of crosswalks and other opportunities for comparable reporting, such as the use of single-item anchor questions. To date, the working group continues to develop consensus on international standards for PROMs collection and reporting. Results of the international consensus building and work to date will be shared.

PROMs incorporate the patient's perspective into the delivery of treatments and care – such as hip and knee arthroplasty – that aim to improve a patient's quality of life. Alignment of standards in PROMs collection across countries will make comparable data available for reporting, in order to inform quality improvement initiatives within health systems to provide better care for patients. CIHI and the OECD will continue to work with member countries to develop international data collection and reporting standards for PROMs, and encourage the adoption of common approaches across countries.


Objective

Guidelines published by the British Association of Spine Surgeons (BASS) and Society of British Neurological Surgeons (SBNS) recommend urgent MRI imaging and intervention in individuals suspected of having CES. The need for an evidence based protocol is driven by a lack of 24/7 MRI services and centralisation of neurosurgery to tertiary centres, compounded by CES's significant medico-legal implications. We conducted an audit to evaluate the pathway for suspected CES in BCUHB West between 2018 and 2021.

Methods

A retrospective audit of patients managed for suspected CES between 01/11/2018 and 01/05/2021 was performed, using the SBNS/BASS guidelines as the standard.


Orthopaedic Proceedings
Vol. 99-B, Issue SUPP_4 | Pages 1 - 1
1 Feb 2017
Guggi T Leunig M Rienmüller A
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Dedication to quality has a longstanding tradition within the Schulthess Clinic. Pioneering documentation Maurice E. Müller initiated an International Documentation & Evaluation System (IDES) in the era of hip replacement becoming an increasingly wide spread and standardized procedure. Starting in 1984, IDES was used to document each and every hip replacement and as of 1995 also for every knee arthroplasty performed. Norbert Gschwend became the driving authority in the clinic for standardizing documentation and regular long term follow-up intervals for all patients.

With increasing interest in patient reported outcomes (PROMs) a shift took place in the basic conception and electronic means (iPads) were introduced in 2012 to let patients complete their part of questionnaires, i.e. EQ-5D, OHS, OKS, UCLA & WOMAC while the clinical part was addressed in the same manner using HHS & KSS.

Optimizing user experience while answering routine questions and allowing for the physician to quickly enter required data without the numbing experience of ever same paper forms largely increased the return on information. This approach also guarantees for complete data sets, often a problem when using pen and paper.

Using these modern tools in combination with a refined recall procedure, we today show follow-up rates of well over 90% in the first post-operative years vs rates of 80% or less prior to introduction.

As of late 2012 the Swiss implant registry for knees & hips was introduced and here again we today use iPads with an app specifically designed to quickly document and register all operations on a daily base, reducing the chore of using paper or web based on line options from 3 to 10 minutes per operation to a mere 20 seconds, fully plausibilized and in this way never returned for corrections.

Pooling this data allows not only for generalized and stringent quality control but also facilitates spotting aberrant trends in the sense of an early warning system within our clinic with regard to procedures and implants.

Pioneering this approach to facilitate & perfect all documentation related procedures we aspire towards an elevated quality level in reporting to help sustain & guarantee patient satisfaction despite the high day-by-day volume.


Orthopaedic Proceedings
Vol. 99-B, Issue SUPP_4 | Pages 7 - 7
1 Feb 2017
Haider H Weisenburger J Garvin K
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Wear testing of THR has chaperoned generations of improved UHMWPE bearings into wide clinical use. However, previous in vitro testing failed to screen many metal-on-metal hips which failed. This talk tours hip wear testing and associated standards, giving an assortment of THR wear test results from the author's laboratory as examples.

Two international hip wear-simulator standards are used: ISO-14242-1 (anatomic configuration) and ISO-14242-3 (orbital-bearing). Both prescribe 5 million (MC) force-motion cycles involving cross-shear synchronized with compression simulating walking gate of ideally aligned THRs. ISO-14242-1 imposes flexion (flex), abduction-adduction (ad-ab) and internal-external (IE) rotations independently and simultaneously. An orbital-bearing simulator more simply rotates either a tilted femoral head or acetabular component, switching from flexion-dominated to ad-ab-dominated phases in each cycle with some IE. In the latter, the acetabular component is typically placed below the femoral head to accentuate abrasive conditions, trapping third-body-wear debris.

Wear is measured (ISO-14242-2) gravimetrically (or volumetrically in some hard-on-hard bearings). Wear-rate ranges from negligible to >80mg/MC beyond what causes osteolysis. This mode-1 adhesive wear can therefore “discriminate” to screen hip designs-materials in average conditions.

Stair-climbing, sitting, squatting and other activities may cause THR edge-loading and even impingement with smaller head-to-neck ratios or coverage angle, naturally worse in metal-on metal hips. Deformation of thin acetabular components during surgical impaction may cause elevated friction or metal-metal contact, shedding more metal-ions and accelerating failure. Surgical misalignments in inclination angle, version and tilt can make this worse, even during modest activities in hard-on-hard bearings. Abrasive particulate debris from bone or bone-cement, hydroxyapatite, neck-impingement, normal wear, or corrosion can compound the above. Such debris can scratch the femoral head surface, or embed in the UHMWPE liner compromising the wear of even metal-on-plastic hips.

Much of the belated standardization activity for higher demand hip testing is in response to the metal-metal failures. ASTM F3047M is a recent non-prescriptive guide for what more rigorous testing can generally be done. Third-body particulate can be intentionally introduced or random scratching of the femoral component surface in extra abrasion testing. Also, the compressive load can be increased, more frequent start-stops to disrupt lubrication, and steepening acetabular shell-liner angles to reduce contact area and cause edge-loading, made harsher when combined with version misalignment. Transient separation can occur between head and liner during the swing phase in a lax THR joint with low coverage angle and misalignments; the separated head impacts the liner rim when reseating. An edge-loading ISO test is currently being discussed where (so-called) “microseparation” to a known distance is directly imposed by a lateral spring force in a hip simulator.

Friction testing of a THR in a pendulum-like setup undergoing flexion or abduction swings is being discussed in the ASTM, and so have multi-dimensional THR friction measurements during a long-term wear test simultaneously measuring and separating friction of three rotational (flex, ad-ab, and IE) axes.

THR wear test methods continue to evolve to address more challenges such as novel duo-mobility THR designs, where UHMWPE bearings cannot be removed for gravimetric wear measurements.


Orthopaedic Proceedings
Vol. 99-B, Issue SUPP_8 | Pages 92 - 92
1 Apr 2017
Smith J Halliday R Aquilina A Hull P Kelly M
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Background

Hip fracture care has evolved, largely due to standardisation of practice, measurement of outcomes and the introduction of the Best Practice Tariff, leading to the sustained improvements documented by the National Hip Fracture Database (NHFD). The treatment of distal femoral fractures in this population has not had the same emphasis. This study defines the epidemiology, current practice and outcomes of distal femoral fractures in four English centres.

Methods

105 patients aged 50 years or greater with a distal femoral fracture, presenting to four UK major trauma centres between October 2010 and September 2011 were identified. Data was collected using an adapted NHFD data collection tool via retrospective case note and radiograph review. Local ethics approval was obtained.


Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_14 | Pages 14 - 14
1 Jul 2016
Kannan S Gulati A Shetty A Godsiff S
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Bowel management following joint replacement is often neglected leading lot of patient distress, with the advent of the enhanced orthopedic rehabilitation program, there is a need of a guideline to ensure prompt and quick recovery of bowel habits before discharge. Our aim was to identify the incidence of constipation in joint replacement patients, to evaluate the current practice of bowel management and formulate a protocol for management of constipation to improve the practice. We conducted a prospective study of 50 patients who underwent joint replacement procedures at our institute between September and October 2015. Following initial audit, we formulated a protocol for bowel management, and performed a re-audit by collecting a prospective data of 50 patients. The statistical analysis was done and calculating the mean and standard deviation for continuous variable and Fischer's exact test was used and significance level was set at 0.05. Incidence of constipation was 88% and laxatives were prescribed in 42%. More importantly, there was no correlation between constipation and pre operative fasting (p Value 0.33), post operative fasting (p Value 0.1822), type of surgery (p value 1.00) and type of anaesthesia (p Value 0.27). Following introduction of bowel protocol the laxative prescription increased to 98% (Prophylactic in 81%), consequently the incidence of constipation reduced to 18%. Implementing bowel protocol significantly will improve the patient care and reduce the rate of complications.


Orthopaedic Proceedings
Vol. 84-B, Issue SUPP_III | Pages 306 - 306
1 Nov 2002
Cziger A Paranjaphe M Katz K
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Purpose: The aim of the study was to establish normal reference standards for the appearance of the femoral head ossification center according to age, sex and gestational age.

Material and Methods: Sonographic examination of the hip was performed in 1800 healthy Indian and Israeli infants (900 each) aged 2 to 24 weeks. There was an equal number of males and females. A single physician performed all examinations in each country. For each infant, we recorded sex, date of birth, gestational age at birth (weeks), date of ultrasound examination, age at examination (weeks), and presence or absence of the femoral head ossification center on sonographic examination. All data were collected in a Microsoft Excell file and submitted for independent statistical analysis using paired Fisher exact test, chi-square test, and a NOVA test.

Results: The ossification center was noted in the second week of life in the Israeli infants and at 8 weeks in the Indian infants. By 20 weeks, however, it was noted in 81% or more of the Indian infants but only 22–74% of the Israeli ones. In both groups between 20 to 24 weeks of age the ossification center was noted in more than 90% of the infants.

Conclusions: Knowledge of the normal sonographic appearance of the femoral head ossification center by age and ethnicity will help clinicians in the diagnosis and treatment of hip disorders.


Orthopaedic Proceedings
Vol. 87-B, Issue SUPP_II | Pages 156 - 156
1 Apr 2005
Nicolaou N Cumming D Gibb P
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Introduction Knee injuries are a common presentation to Accident and Emergency departments. Often many injuries that are referred are minor as a result of the difficulty in initial assessment, and cause an unnecessary increase in workload in Orthopaedic clinics. The purpose of this study was to evaluate current practice at our Knee Injury Clinic and to implement changes to make the service more efficient and effective. It forms a completed audit cycle of current practice.

Material and methods Part I: We assessed all referrals from our Accident & Emergency department in two separate 4 month periods to the Acute Knee Injury Clinic according to the following criteria (which need fulfilling for referral)-

Recent history of injury associated with one or more of the following:

Acute haemarthrosis

Clinical instability

Disproportionate pain

Locking

Referrals were assessed as fulfilling or not fulfilling the criteria, and also as to the ultimate diagnosed pathology.

Part II: From the results of these two audits, a multidisciplinary treatment proforma was created and distributed to Accident and Emergency. This included physiotherapy as a primary treatment option. Referrals were then reassessed as in the previous audits for a 4-month period.

Results and conclusions The Acute Knee Injury Pro-forma resulted in a 15% reduction in referrals not fulfilling the criteria (p=< 0.05). This equates to a reduced workload due to inappropriate referrals, while significant injuries such as Cruciate rupture are picked up due to the sensitivity of the criteria.

There was a significant increase in patients referred directly from Accident and Emergency to the physiotherapy department, which means minor injuries receive physiotherapy earlier than if they initially came to clinic.

The proforma was well received by the junior doctors in Accident and Emergency due to its simplicity.

Overall the use of the proforma has improved the standard of care at our unit.


Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_23 | Pages 29 - 29
1 Dec 2016
Parker S Davies L Sanders-Crook L Key T Roberts G Hughes H White S
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Aim

Peri-prosthetic joint infection is a serious and expensive complication of joint arthroplasty. Theatre discipline has infection prevention at its core with multiple studies correlating increased door opening with surgical site infection. The WHO, NICE and Philadelphia Consensus all advocate minimal theatre traffic. The Dutch Health Inspectorate consider >5 door openings per procedure excessive.

Method

This prospective observational study over five weeks observed theatre door traffic during hip and knee arthroplasty within the eight laminar flow theatres at our institution. Two students attached to the department collected data. Half way through the study notices reminding people not to enter during arthroplasty were placed on the theatre doors.


Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_30 | Pages 5 - 5
1 Aug 2013
Soon V Periasamy K
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BACKGROUND

Since 1996, the Scottish Hip Fracture Audit (SHFA) group have published reports on the outcomes of patients with hip fractures. In the 2008 report, the group outlined the target standard that “98% of medically fit patients who have sustained a hip fracture should be operated on within 24 hours of ‘safe operating time’ (i.e. between 8 am and 8pm, seven days a week).”1.

AIM

We aim to investigate the compliance of our unit to the SHFA target standard.


Orthopaedic Proceedings
Vol. 97-B, Issue SUPP_7 | Pages 27 - 27
1 May 2015
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Studies of operation notes have shown they can vary in quality and affect patient safety. This audit compares the quality of operation notes against standards set by the Royal College of Surgeons of England and the British Orthopaedic Association.

Information from operation notes was collected prospectively over a two-week period. All operations performed were included and trainees from the region coordinated data collection in 9 hospitals.

Data from 1091 operation notes was reviewed. A number of standards were nearly met including legibility (98.4%), the name of operating surgeon (99.3%) and operation title (99.1%). However a number of standards were not met and those with potential patient safety implications include availability on the ward (88.8%), documentation of type of anaesthetic used (78.6%), diagnosis (73.4%) and findings (80.1%). In addition, the postoperative instructions recorded the need for and type of postoperative antibiotics or venous thromboembolism prophylaxis in only 49.7% and 48.8% of cases respectively.

The quality of operation notes studied across the region in this period was variable. Software programmes meant some hospitals had better results for date, time and patient identification details. Following this study, awareness of the standards combined with additional local measures may improve the quality of operation notes.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXVIII | Pages 53 - 53
1 Jun 2012
Murray O Christen K Marsh A Bayer J
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Current fracture-clinic models, especially in the advent of reductions in junior doctors hours, may limit outpatient trainee education and patient care. We designed a new model of fracture-clinic, involving an initial consultant led case review focused on patient management and trainee education.

Outcomes for all new patients attending the redesigned fracture-clinic over a 3-week period in 2010 were compared with the traditional clinic in the same period in 2009. Health professionals completed a Likert questionnaire assessing their perceptions of education, support, standards of patient care and morale before and after the clinic redesign.

309 and 240 patients attended the clinics in 2009 and 2010 respectively. There was an increase in consultant input into patient management after the redesign (29% versus 84%, p<0.0001), while the proportion of patients requiring physical review by a consultant fell (32% versus 9%). The percentage of new patients discharged by junior medical staff increased (17% versus 25%) with a reciprocal fall in return appointments (55% versus 40%, p<0.0005). Overall, return appointment rates fell significantly (55% versus 40%, p=0.013). Staff perception of education and senior support improved from 2 to 5, morale and overall perception of patient care from 4 to 5.

Our model of fracture-clinic redesign has significantly enhanced consultant input into patient care without additional funding. In addition, we have demonstrated increased service efficiency and significant improvements in staff support, morale and education. In the face of current economic and training challenges, we recommend this new model as a tool for enhancing patient and trainee experiences.


Orthopaedic Proceedings
Vol. 95-B, Issue SUPP_30 | Pages 13 - 13
1 Aug 2013
Klenka S Dolan R
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Collection of new data for the Scottish hip fracture audit stopped in December 2008. The proposed standard of operating on 98% of all hip fractures within 24 hours of admission, subject to medical fitness and during safe operating hours should now be maintained.

Methods

We prospectively collected data from 102 consecutive hip fracture patients documenting the patient's journey from admission to discharge from the orthopaedic ward to look at whether the standard had been maintained.

Results

50% of patients get to theatre 24hrs or earlier with 60% catheterised perioperatively.50% of patients were moved from the acute orthopaedic facility at a week with less than 20% of these getting back to their usual place of residence. 25% were still on the acute ward at two weeks and 3% died in the immediate post operative period. However, the number of co-morbidities did not seem to correlate with time to discharge. The majority of patients transferred to onward care moved to the geriatric rehabilitation ward within the hospital.

Prioritisation of hip fracture patients on the trauma list needs to be continued along with improvements in the availability of rehabilitation beds. Pre-operative medical work up for patients with reversible illness and post-operative geriatric care will improve the outcomes for these frail patients.


Orthopaedic Proceedings
Vol. 88-B, Issue SUPP_I | Pages 2 - 2
1 Mar 2006
Currie C Hutchison J Yellowlees A
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The Scottish Hip Fracture Audit (1) was founded on Rikshoft, the Swedish hip fracture register (2), and since 1993 has documented case-mix, process and outcomes of hip fracture care in Scotland. Evidence-based national guidelines on hip fracture care were updated by a multidisciplinary group in 2002(3). And hip fracture serves as a tracer condition by the health quality assurance authority for its work on older people, which reported in 2004 (4).

Audit data are used locally to document care and support and monitor service developments. Synergy between the guidelines and the audit provides a means of improving care locally and monitoring care nationally. External review by the quality assurance body shows to what extent guideline-based standards relating to A& E care, pre-operative delay, multidisciplinary care and audit participation are met.

Three national-level initiatives on hip fracture care have delivered: reliable and largescale comparative information on case-mix, care and outcomes; evidence-based recommendations on care; and nationally accountable standards inspected and reported by the national health quality assurance authority. These developments are linked and synergistic, and enjoy both clinical and managerial support. They provide an evolving framework for clinical governance and quality assurance, with methods for casemix-adjusted outcome assessment for hip fracture care also now developed.


Orthopaedic Proceedings
Vol. 93-B, Issue SUPP_II | Pages 181 - 181
1 May 2011
Vasireddy A Navadgi B Deo S Satish V Lowdon I
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Purpose of study: With the increasing demand for arthroplasty surgery, it is important to maintain a high quality of care. We describe a clinical governance framework for a simple, easy to implement method of assessing and monitoring radiological outcome following total knee arthroplasty.

Methods: We completed a two-year prospective study (January 2006 to December 2007 inclusive) of all total knee arthroplasty operations. This included 1,295 procedures, the majority of which were undertaken by two Consultant Surgeons and up to eight independent middle grade surgeons. The two Consultant Knee Surgeons assessed component position on standard post-operative weight-bearing antero-posterior and lateral knee radiographs on a weekly basis. They were blinded to both the patient and surgeon details, and used our own simple grading system, whose weighted Kappa variance showed ‘moderate’ interobserver (K = 0.41) and intraobserver reliability (K = 0.51). Our system comprised of only three ordinal scores, which were good (score of 1), acceptable (score of 2) and poor (score of 3).

Results: We provided individual surgeons with their results on a six-monthly basis. The average score for all the surgeons was good. The scores of the independent middle-grade surgeons were analysed by the Consultants, and feedback was provided in the form of formal advice and supervised surgery sessions. Repeat proportional analysis of their radiological scores showed significant improvements for all the individual surgeons (Pearson-Chi Square p value < 0.05).

Conclusions: Clinical governance is an important facet of excellence in medical practice. Our system allows continued prospective assessment of radiological outcome following total knee arthroplasty. By utilising such systems and ensuring an atmosphere of clinical excellence, we are able to employ more surgeons and undertake an increased workload, whilst maintaining high standards. This assessment tool can also be used to assess and appraise trainees during their progression.


Orthopaedic Proceedings
Vol. 99-B, Issue SUPP_5 | Pages 6 - 6
1 Mar 2017
Mell S Fullam S Wimmer M Lundberg H
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Generic walking profiles applied to mechanical knee simulators are the gold standard in wear testing of total knee replacements (TKRs). Recently, there was a change in the international standard (ISO) for knee wear testing (ISO 14243-3): the direction of motion in the anterior/posterior (AP) and internal/external (IE) directions were reversed. The effects of this change have not been investigated, therefore it is not known whether results generated by following this new standard can be compared to historical wear tests which used the old standard. Using a finite element analysis (FEA) model of a TKR in parallel with an energy based wear model and adaptive remeshing, we investigated differences in wear between the newest ISO standard developed in 2014, and the previous ISO standard developed in 2004.

CAD models of a left sided NexGen Cruciate Retaining (CR) TKR (Zimmer, Warsaw, IN) were used to create the FEA model (Figure 1). The loads and motions specified by simulator standards ISO 14243-3(2004) and ISO 14243-3(2014) were applied to the model. Analyses were run using ABAQUS v6.13-2 Standard (Dassault Systèmes, Waltham, MA). 8 node hexahedral elements were used to model the UHMWPE component. The contact was modeled as penalty contact, with the friction coefficient set to 0.04 on the articular surface. The cobalt chromium molybdenum femoral component was modeled as a rigid surface, utilizing a mix of 2nd order quadrilaterals and tetrahedrons. Wear of the polyethylene (PE) component was predicted to 1,000,000 cycles using a previously published frictional energy-based wear model. The wear model, developed from data generated in wheel-on-flat tests, utilizes two parameters defining the frictional energy required to remove a unit volume of material both parallel (3.86E8 J/mm3) and perpendicular (3.55E7 J/mm3) to the primary polyethylene fibril direction. Primary fibril direction for the analysis was set to the AP direction. Wear for each simulation of a gait cycle was scaled to 500,000 cycles. Two gait cycles were simulated representing 1,000,000 cycles in total. Adaptive remeshing was driven by the wear model, with the mesh being updated every time increment to simulate material ablation. The time step size was variable with a maximum of 0.01s.

The FEA predicted higher wear rates for the newest ISO standard (7.34mg/million cycles) compared to the previous standard (6.04mg/million cycles) (Figure 2). Comparing the predicted wear scars (Figure 3), the new version of the standard covered a larger percentage of the total articular surface, with wear being more spread out as opposed to localized. This is more similar to what is seen in patient retrievals.

The results of the study suggest that major differences between the old and the new ISO standard exist and therefore historical wear results are not comparable to newly obtained results. In addition, this study demonstrates the utility of FEA in wear analysis, though the wear model needs further work and validation before it can be used as a supplement to simulator testing. Validation of the wear model against simulator tests and pin-on-disk experiments is currently underway.

For figures/tables, please contact authors directly.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_II | Pages 38 - 38
1 Feb 2012
Jain N Willett K
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Quality assurance for training in trauma and orthopaedics was provided by the JCHST through the SAC for Trauma and Orthopaedics. To date there have been written SAC standards; some are compulsory and others advisory and will generate requirements or recommendations to change if unmet on inspection. There has been a major change in the way postgraduate training is monitored and quality assured, with the formation of the PMETB, which now has the combined responsibility for all postgraduate training.

The aims and objectives of our study were to measure the effectiveness of the current quality assurance system for training in Trauma and Orthopaedics, and to determine the reduction in the number of unmet compulsory standards at the end of the visits process and how effectively these requirements were implemented. We also identified the deficiencies in each component of training and determined the current general profile of the quality of training in Trauma and Orthopaedics. The inspection visits, progress and revisit reports were collected from training regions that were visited after the standards were implemented.

In 109 units, in the 3 years studied, the inspection process reduced the overall unmet standards from a mean of 14.8% (10.3-19.2%) to 8.9% (6.5%-12.7%). The number of unmet requirement per unit fell from 4.6 to 2.8 (p<0.05). 27% of units did not improve. Overall 15% of standards were deficient, least in Scottish units and most in Irish units. Currently registrars do 1.4 trauma lists, 2.8 elective lists, 1.3 fracture clinics and 2.1 elective clinics per week. This is the first multi-regional study of a national accreditation process. Quality assurance requires standards setting and rectification. These findings are important for the imminent restructuring by the Postgraduate Medical Education Board.


Orthopaedic Proceedings
Vol. 94-B, Issue SUPP_XXXI | Pages 25 - 25
1 Jul 2012
Lau S Bhagat S Baddour E Gul A Ahuja S
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Introduction

The British Scoliosis Society published a document in 2008 which set out the minimum standards for paediatric spinal deformity services to achieve over a period of time. But how do the UK paediatric spinal deformity centres measure up to these benchmarks?

Methods

We performed a telephonic survey, contacting every UK spinal deformity centre. The questionnaire probed how each unit compared to the recommended standards.