A critical examination of the Australian Orthopaedic Association National Joint Replacement Registry: Improving outcomes of hip and knee replacement

Introduction Total Hip Replacement (THR) and Total Knee Replacement (TKR) are effective operations for patients with end stage arthritis who can no longer be adequately treated non-operatively. It is increasingly important that these procedures be closely monitored so that the best results can be achieved for patients and optimum use of health resources achieved. Joint replacement registries collect, analyse and report data on patients undergoing joint replacement surgery and can monitor numbers and changes over time, evaluate outcomes and identify patient and prostheses factors associated with these outcomes. The aim of this thesis is to study the impact of the Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR) on hip and knee replacement in Australia. It will explore whether joint replacement outcomes have improved since the introduction of the Registry and critically assess the role of the Registry in this process. Within this main aim, the thesis addresses 4 specific research questions: 1. How are prostheses that are not performing as well as others in their class identified and what are the consequences of this? 2. How does the AOANJRR monitor the impact of new technology such as computer navigation for TKR and the consequences of this? 3. How does the AOANJRR monitor the introduction and impact of new materials with specific reference to crosslinked polyethylene for both THR and TKR? 4. What role has the AOANJRR played in the change of practice, policies and outcomes of hip and knee Replacement in Australia? Methodology The thesis involves a systematic investigation using data from the AOANJRR to address the research questions. The questions were appropriately defined to retrieve information from the Registry for critical examination and analysis. The basic framework is empirical. The processes and analytical methods used to answer specific quantitative research questions are standard and currently in place at the Registry. The research questions were developed to examine data that could specifically be addressed by the AOANJRR and with minimal information available from other national registries or other sources. These were designed with the aim of determining whether any demonstrated improvements in joint replacement outcomes were likely due to the Registry. Results The revision rates for hip and knee joint replacements have improved since the inception of the Registry. The revision burden for total joint replacement is defined as the proportion of all hip and knee replacement procedures that are revisions. In Australia, the revision burden for total hip replacement has declined from 13.1% in 2002/2003 (the first year of full Registry national data) to 9.8% in 2015/2016. For knee replacements the revision burden has declined from 9.3% in 2002/2003 to 7.4% in 2015/2016. This equates to a 25% reduction in the burden of revision for hip replacement and a 20% reduction for knee replacement over the respective periods. The rate of revision for primary THR has declined from 4.8% at 6 years for the time period 2003-2006 to 3.6% at 6 years for THR performed between 2011 -2014. A similar reduction is also seen for TKR over the same period with a decrease in the rate of revision from 5.1% for procedures performed from 2003 -2006 compared to 3.8% for procedures performed from 2011-2014. The role of the Registry in improving the outcomes of joint replacement is addressed within the context of the research questions. The first paper described the process and the evolution over time of methods the Registry has developed to identify devices with a higher than anticipated rate of revision. As a consequence of reporting these devices, there has been a 67% reduction in THRs and a 76% reduction in the use of TKRs that have been so identified in the following year. The international consequence of this process is followed up later in the thesis. TKR has a higher rate of revision for younger patients and methods to reduce this rate of revision are important. The use of computer navigation results in an overall reduction in the rate of revision for patients < 65 years of age and a reduction for loosening in patients of all ages. 4 The introduction of crosslinked polyethylene (XLPE) results in a prosthesis specific reduction in revisions for both TKR and THR compared to the use of the standard conventional non cross-linked polyethylene. For younger patients, <55 years of age, there is a fivefold reduction in the rate of revision for THR at 15 years compared to the use of conventional non cross-linked polyethylene. The Registry was the first to report a reduction in revision with the use of XLPE for hip and knee replacements. This has important implications and may enable younger patients to undergo surgery, confident of a reduced need for revision in the long term. The penultimate chapter outlines the contribution that the Registry has made to the improved outcomes of joint replacement in Australia by examining the interaction with multiple stakeholders. The chapter illustrates the many ways this has been achieved and uses case examples of feedback with resultant change of practice. The interaction of the Registry with the Australian Government, Regulatory authorities, Industry, and Medical Insurers outlines the importance of involving all stakeholders when striving to improve healthcare outcomes. Conclusion There has been a substantial improvement in the outcomes of hip and knee replacement in Australia over the past 14 years. This thesis outlines the ways by which this has been achieved and outlines the critical role of the Registry in achieving these improved outcomes.Thesis (Ph.D.) -- University of Adelaide, School of Public Health, 201

Pulse-lavage brushing followed by hydrogen peroxide-gauze packing for bone-bed preparation in cemented total hip arthroplasty : a bovine model

To compare the effectiveness of pulse-lavage brushing followed by hydrogen peroxide-gauze packing with either technique alone or normal-saline irrigation in bone-bed preparation for cemented total hip arthroplasty. 44 fresh-frozen ox femoral canals were prepared for cemented total hip arthroplasty using 4 techniques: normal-saline irrigation, pulse-lavage brushing, hydrogen peroxide-soaked gauze packing, and a combination of the latter 2 techniques. The maximum tensile pull-out force required to separate the prosthesis from the femoral canal was measured as an indicator of the strength of the cement-bone interface. The mean pull-out force to separate the prosthesis from the femoral canal was significantly higher in specimens prepared with pulse-lavage brushing followed by hydrogen peroxide-soaked gauze packing or pulse-lavage brushing alone than those prepared with normal-saline irrigation or hydrogen peroxide-soaked gauze packing alone 300(p&lt;0.001). Pulse-lavage brushing is more effective at cleansing the femoral canal and increasing mechanical strength at the cement-bone interface than preparation with normal-saline irrigation or hydrogen peroxide-soaked gauze packing.<br /

MyStay – Development of nurse-facilitated condition-specific multimedia resources to facilitate patient participation in postoperative care

Improved postoperative outcomes and the global drive toward the provision of patient-centred care underpins efforts to enhance the nature and capacity of patient participation in acute postoperative hospital care. In this paper, we describe the design, framework and processes used to develop a modular, procedure-specific, digital health intervention platform aimed at improving the patient experience and patient participation in care following surgery. The intervention, a multimedia application MyStay, uses bedside delivery of audio-visual and text-based information to engage postoperative patients to better participate in their care. MyStay modules are developed using an iterative, multi-method approach intended to balance procedure-specific best evidence, current clinical practice, and patient preferences. Development involves six key elements: (1) Empathise with target users, (2) Ground in evidence and behavioural theory, (3) Specify target behaviours, (4) Integration of health service standards and clinical care pathways/guidelines, (5) Build and refine the multimedia product and, (6) Pilot implementation to assess potential effectiveness and usability. To-date, we have developed four procedure-specific MyStay modules and an additional three are under development. Initial patient usage data for the Total Knee Replacement (TKR) and cardiac surgery applications indicated that users accessed a wide range of text-based and audio-visual information, most frequently recovery goals and exercises following TKR, and postoperative recovery information for the intensive care unit following cardiac surgery. As previous research that tested MyStay indicated its efficacy in optimising clinical postoperative outcomes, this framework may be useful in the development of other digital health innovations. Further research is required to assess patient and clinician engagement and determine whether MyStay is associated with improved patient outcomes across varied clinical contexts. Experience Framework This article is associated with the Innovation & Technology lens of The Beryl Institute Experience Framework (https://www.theberylinstitute.org/ExperienceFramework). Access other PXJ articles related to this lens. Access other resources related to this len

Incidence, Costs and Predictors of Non-Union, Delayed Union and Mal-Union Following Long Bone Fracture

Fracture healing complications are common and result in significant healthcare burden. The aim of this study was to determine the rate, costs and predictors of two-year readmission for surgical management of healing complications (delayed, mal, non-union) following fracture of the humerus, tibia or femur. Humeral, tibial and femoral (excluding proximal) fractures registered by the Victorian Orthopaedic Trauma Outcomes Registry over five years (n = 3962) were linked with population-level hospital admissions data to identify two-year readmissions for delayed, mal or non-union. Study outcomes included hospital length-of-stay (LOS) and inpatient costs. Multivariable logistic regression was used to determine demographic and injury-related factors associated with admission for fracture healing complications. Of the 3886 patients linked, 8.1% were readmitted for healing complications within two years post-fracture, with non-union the most common complication and higher rates for femoral and tibial shaft fractures. Admissions for fracture healing complications incurred total costs of $4.9 million AUD, with a median LOS of two days. After adjusting for confounders, patients had higher odds of developing complications if they were older, receiving compensation or had tibial or femoral shaft fractures. Patients who are older, with tibial and femoral shaft fractures should be targeted for future research aimed at preventing complications

Mortality and implant survival with simultaneous and staged bilateral total knee arthroplasty experience from the Australian Orthopaedic Association National Joint Replacement Registry

BACKGROUND: Total knee arthroplasty (TKA) is an effective procedure for relieving pain and restoring function in osteoarthritis, with a significant proportion of patients having severe disease bilaterally. However, although there are differences in patient selection criteria for bilateral procedures, there is no consensus regarding the optimal timing for bilateral TKA. The aim of this study was to compare rates and causes of revision and 30-day mortality between simultaneous and staged bilateral TKA using data from the Australian Orthopaedic Association National Joint Replacement Registry. METHODS: Data for over 36,000 bilateral TKAs were collected from September 1999 to December 2015. Rates and causes of revision and 30-day mortality rates were obtained for simultaneous bilateral and staged procedures with intervals of 1 day-6 weeks, 6 weeks-3 months, and 3-6 months. Yearly cumulative percent revision or cumulative percent survival with 95% confidence intervals calculated using the Kaplan-Meier method and adjusted hazard ratios were used for comparisons. RESULTS: There was no significant difference between revision rates or reasons for revision between staged bilateral and simultaneous TKA (hazard ratio 1.09 [95% confidence interval {CI} 0.85-1.40; P = .511] for 1 day-6 weeks, 0.93 [95% CI 0.77-1.14; P = .494] for 6 weeks-3 months, and 1.10 [95% CI 0.98-1.23; P = .115] for 3-6 months). The most common reasons for revision were loosening/lysis and infection. The 30-day mortality rates were lower in the 6 weeks-3 months group than simultaneous bilaterals (P = .007). CONCLUSION: This study demonstrates that simultaneous and staged bilateral TKA have similar rates of revision over the medium term but that 30-day mortality is reduced in the 6 weeks-3 months group

Poor outcome of revised resurfacing hip arthroplasty: 397 cases from the Australian Joint Replacement Registry

BACKGROUND AND PURPOSE: Recent years have seen a rapid increase in the use of resurfacing hip arthroplasty despite the lack of literature on the long-term outcome. In particular, there is little evidence regarding the outcome of revisions of primary resurfacing. The purpose of this analysis was to examine the survivorship of primary resurfacing hip arthroplasties that have been revised. PATIENTS AND METHODS: Over 12,000 primary resurfacing hip arthroplasties were recorded by the Australian Orthopaedic Association National Joint Replacement Registry between September 1, 1999 and December 31, 2008. During this time, 397 revisions for reasons other than infection were reported for these primary resurfacings and classified as acetabular, femoral, or both acetabular and femoral revisions. The survivorship of the different types of revisions was estimated using the Kaplan-Meier method and compared using proportional hazard models. Additionally, the outcome of a femoral-only revision was compared to that of primary conventional total hip arthroplasty. RESULTS: Acetabular-only revision had a high risk of re-revision compared to femoral-only and both acetabular and femoral revision (5-year cumulative per cent revision of 20%, 7%, and 5% respectively). Femoral-only revision had a risk of re-revision similar to that of revision of both the acetabular and femoral components. Femoral-only revision had over twice the risk of revision of primary conventional total hip arthroplasty. INTERPRETATION: Revision of a primary resurfacing arthroplasty is associated with a major risk of re-revision. The best outcome is achieved when either the femoral-only or both the acetabular and femoral components are revised. Technically straightforward femoral-only revisions generally have a worse outcome than a primary conventional total hip arthroplasty

Competing risks survival analysis applied to data from the Australian Orthopaedic Association National Joint Replacement Registry

BACKGROUND AND PURPOSE: The Kaplan-Meier (KM) method is often used in the analysis of arthroplasty registry data to estimate the probability of revision after a primary procedure. In the presence of a competing risk such as death, KM is known to overestimate the probability of revision. We investigated the degree to which the risk of revision is overestimated in registry data. PATIENTS AND METHODS: We compared KM estimates of risk of revision with the cumulative incidence function (CIF), which takes account of death as a competing risk. We considered revision by (1) prosthesis type in subjects aged 75–84 years with fractured neck of femur (FNOF), (2) cement use in monoblock prostheses for FNOF, and (3) age group in patients undergoing total hip arthroplasty (THA) for osteoarthritis (OA). RESULTS: In 5,802 subjects aged 75–84 years with a monoblock prosthesis for FNOF, the estimated risk of revision at 5 years was 6.3% by KM and 4.3% by CIF, a relative difference (RD) of 46%. In 9,821 subjects of all ages receiving an Austin Moore (non-cemented) prosthesis for FNOF, the RD at 5 years was 52% and for 3,116 subjects with a Thompson (cemented) prosthesis, the RD was 79%. In 44,365 subjects with a THA for OA who were less than 70 years old, the RD was just 1.4%; for 47,430 subjects > 70 years of age, the RD was 4.6% at 5 years. INTERPRETATION: The Kaplan-Meier method substantially overestimated the risk of revision compared to estimates using competing risk methods when the risk of death was high. The bias increased with time as the incidence of the competing risk of death increased. Registries should adopt methods of analysis appropriate to the nature of their data.Marianne H. Gillam, Philip Ryan, Stephen E. Graves, Lisa N. Miller, Richard N. de Steiger and Amy Salte

Outcome of primary resurfacing hip replacement: evaluation of risk factors for early revision: 12,093 replacements from the Australian Joint Registry

BACKGROUND AND PURPOSE: The outcome of modern resurfacing remains to be determined. The Australian Orthopaedic Association National Joint Replacement Registry (AOANJRR) started collection of data on hip resurfacing at a time when modern resurfacing was started in Australia. The rate of resurfacing has been higher in Australia than in many other countries. As a result, the AOANJRR has one of the largest series of resurfacing procedures. This study was undertaken to determine the results of this series and the risk factors associated with revision. PATIENTS AND METHODS: Data from the AOANJRR were used to analyze the survivorship of 12,093 primary resurfacing hip replacements reported to the Joint Replacement Registry between September 1999 and December 2008. This was compared to the results of primary conventional total hip replacement reported during the same period. The Kaplan-Meier method and proportional hazards models were used to determine risk factors such as age, sex, femoral component size, primary diagnosis, and implant design. RESULTS: Female patients had a higher revision rate than males; however, after adjusting for head size, the revision rates were similar. Prostheses with head sizes of less than 50 mm had a higher revision rate than those with head sizes of 50 mm or more. At 8 years, the cumulative per cent revision of hip resurfacing was 5.3 (4.6-6.2), as compared to 4.0 (3.8-4.2) for total hip replacement. However, in osteoarthritis patients aged less than 55 years with head sizes of 50 mm or more, the 7-year cumulative per cent revision for hip resurfacing was 3.0 (2.2-4.2). Also, hips with dysplasia and some implant designs had an increased risk of revision. INTERPRETATION: Risk factors for revision of resurfacing were older patients, smaller femoral head size, patients with developmental dysplasia, and certain implant designs. These results highlight the importance of patient and prosthesis selection in optimizing the outcome of hip resurfacing

The use of antibiotic-loaded bone cement and systemic antibiotic prophylactic use in 2,971,357 primary total knee arthroplasties from 2010 to 2020: an international register-based observational study among countries in Africa, Europe, North America, and Oceania.

BACKGROUND AND PURPOSE Antibiotic-loaded bone cement (ALBC) and systemic antibiotic prophylaxis (SAP) have been used to reduce periprosthetic joint infection (PJI) rates. We investigated the use of ALBC and SAP in primary total knee arthroplasty (TKA). PATIENTS AND METHODS This observational study is based on 2,971,357 primary TKAs reported in 2010-2020 to national/regional joint arthroplasty registries in Australia, Denmark, Finland, Germany, Italy, the Netherlands, New Zealand, Norway, Romania, South Africa, Sweden, Switzerland, the UK, and the USA. Aggregate-level data on trends and types of bone cement, antibiotic agents, and doses and duration of SAP used was extracted from participating registries. RESULTS ALBC was used in 77% of the TKAs with variation ranging from 100% in Norway to 31% in the USA. Palacos R+G was the most common (62%) ALBC type used. The primary antibiotic used in ALBC was gentamicin (94%). Use of ALBC in combination with SAP was common practice (77%). Cefazolin was the most common (32%) SAP agent. The doses and duration of SAP used varied from one single preoperative dosage as standard practice in Bolzano, Italy (98%) to 1-day 4 doses in Norway (83% of the 40,709 TKAs reported to the Norwegian arthroplasty register). CONCLUSION The proportion of ALBC usage in primary TKA varies internationally, with gentamicin being the most common antibiotic. ALBC in combination with SAP was common practice, with cefazolin the most common SAP agent. The type of ALBC and type, dose, and duration of SAP varied among participating countries

Periprosthetic Joint Infection After Total Knee Arthroplasty With or Without Antibiotic Bone Cement.

IMPORTANCE Despite increased use of antibiotic-loaded bone cement (ALBC) in joint arthroplasty over recent decades, current evidence for prophylactic use of ALBC to reduce risk of periprosthetic joint infection (PJI) is insufficient. OBJECTIVE To compare the rate of revision attributed to PJI following primary total knee arthroplasty (TKA) using ALBC vs plain bone cement. DESIGN, SETTING, AND PARTICIPANTS This international cohort study used data from 14 national or regional joint arthroplasty registries in Australia, Denmark, Finland, Germany, Italy, New Zealand, Norway, Romania, Sweden, Switzerland, the Netherlands, the UK, and the US. The study included primary TKAs for osteoarthritis registered from January 1, 2010, to December 31, 2020, and followed-up until December 31, 2021. Data analysis was performed from April to September 2023. EXPOSURE Primary TKA with ALBC vs plain bone cement. MAIN OUTCOMES AND MEASURES The primary outcome was risk of 1-year revision for PJI. Using a distributed data network analysis method, data were harmonized, and a cumulative revision rate was calculated (1 - Kaplan-Meier), and Cox regression analyses were performed within the 10 registries using both cement types. A meta-analysis was then performed to combine all aggregated data and evaluate the risk of 1-year revision for PJI and all causes. RESULTS Among 2 168 924 TKAs included, 93% were performed with ALBC. Most TKAs were performed in female patients (59.5%) and patients aged 65 to 74 years (39.9%), fully cemented (92.2%), and in the 2015 to 2020 period (62.5%). All participating registries reported a cumulative 1-year revision rate for PJI of less than 1% following primary TKA with ALBC (range, 0.21%-0.80%) and with plain bone cement (range, 0.23%-0.70%). The meta-analyses based on adjusted Cox regression for 1 917 190 TKAs showed no statistically significant difference at 1 year in risk of revision for PJI (hazard rate ratio, 1.16; 95% CI, 0.89-1.52) or for all causes (hazard rate ratio, 1.12; 95% CI, 0.89-1.40) among TKAs performed with ALBC vs plain bone cement. CONCLUSIONS AND RELEVANCE In this study, the risk of revision for PJI was similar between ALBC and plain bone cement following primary TKA. Any additional costs of ALBC and its relative value in reducing revision risk should be considered in the context of the overall health care delivery system