We used the National Joint Registry for England, Wales, Northern Ireland and the Isle of Man (NJR) to investigate the risk of revision due to prosthetic joint infection (PJI) for patients undergoing primary and revision hip arthroplasty, the changes in risk over time, and the overall burden created by PJI. We analysed revision total hip arthroplasties (THAs) performed due to a diagnosis of PJI and the linked index procedures recorded in the NJR between 2003 and 2014. The cohort analysed consisted of 623 253 index primary hip arthroplasties, 63 222 index revision hip arthroplasties and 7585 revision THAs performed due to a diagnosis of PJI. The prevalence, cumulative incidence functions and the burden of PJI (total procedures) were calculated. Overall linear trends were investigated with log-linear regression.Objectives
Methods
Introduction. The Centers for Medicare and Medicaid Services (CMS) removed total knee arthroplasty (TKA) from inpatient-only status in 2018. Our goal was to measure the adoption of outpatient TKAs, the impact on re-treatment rates, and the economic implications for hospitals. Methods. We utilized 100% national Medicare Part A fee-for-service (FFS) patient-level claims data for 2017–2018. We excluded DRG 469 TKAs since they are unlikely to be outpatient candidates, which left 257,107 primary TKAs in 2017 and 264,393 in 2018. We examined the
Our primary aim was to establish the proportion of female orthopaedic consultants who perform arthroplasty via cases submitted to the National Joint Registry (NJR), which covers England, Wales, Northern Ireland, the Isle of Man, and Guernsey. Secondary aims included comparing time since specialist registration, private practice participation, and number of hospitals worked in between male and female surgeons. Publicly available data from the NJR was extracted on the types of arthroplasty performed by each surgeon, and the number of procedures of each type undertaken. Each surgeon was cross-referenced with the General Medical Council (GMC) website, using GMC number to extract surgeon demographic data. These included sex, region of practice, and dates of full and specialist registration.Aims
Methods
This study aimed to investigate the estimated change in primary and revision arthroplasty rate in the Netherlands and Denmark for hips, knees, and shoulders during the COVID-19 pandemic in 2020 (COVID-period). Additional points of focus included the comparison of patient characteristics and hospital type (2019 vs COVID-period), and the estimated loss of quality-adjusted life years (QALYs) and impact on waiting lists. All hip, knee, and shoulder arthroplasties (2014 to 2020) from the Dutch Arthroplasty Register, and hip and knee arthroplasties from the Danish Hip and Knee Arthroplasty Registries, were included. The expected number of arthroplasties per month in 2020 was estimated using Poisson regression, taking into account changes in age and sex distribution of the general Dutch/Danish population over time, calculating observed/expected (O/E) ratios. Country-specific proportions of patient characteristics and hospital type were calculated per indication category (osteoarthritis/other elective/acute). Waiting list outcomes including QALYs were estimated by modelling virtual waiting lists including 0%, 5% and 10% extra capacity.Aims
Methods
Early large treatment effects can arise in small studies, which lessen as more data accumulate. This study aimed to retrospectively examine whether early treatment effects occurred for two multicentre orthopaedic randomized controlled trials (RCTs) and explore biases related to this. Included RCTs were ProFHER (PROximal Fracture of the Humerus: Evaluation by Randomisation), a two-arm study of surgery versus non-surgical treatment for proximal humerus fractures, and UK FROST (United Kingdom Frozen Shoulder Trial), a three-arm study of two surgical and one non-surgical treatment for frozen shoulder. To determine whether early treatment effects were present, the primary outcome of Oxford Shoulder Score (OSS) was compared on forest plots for: the chief investigator’s (CI) site to the remaining sites, the first five sites opened to the other sites, and patients grouped in quintiles by randomization date. Potential for bias was assessed by comparing mean age and proportion of patients with indicators of poor outcome between included and excluded/non-consenting participants.Aims
Methods
Prosthetic joint infection (PJI) is an uncommon but serious complication of hip and knee replacement. We investigated the rates of revision surgery for the treatment of PJI following primary and revision hip and knee replacement, explored
The aim of this study was to conduct a cross-sectional, observational cohort study of patients presenting for revision of a total hip, or total or unicompartmental knee arthroplasty, to understand current routes to revision surgery and explore differences in symptoms, healthcare use, reason for revision, and the revision surgery (surgical time, components, length of stay) between patients having regular follow-up and those without. Data were collected from participants and medical records for the 12 months prior to revision. Patients with previous revision, metal-on-metal articulations, or hip hemiarthroplasty were excluded. Participants were retrospectively classified as ‘Planned’ or ‘Unplanned’ revision. Multilevel regression and propensity score matching were used to compare the two groups.Aims
Methods
The aims of this study were to determine the rates of surgical complications, reoperations, and readmissions following herniated lumbar disc surgery, and to investigate the impact of sociodemographic factors and comorbidity on the rate of such unfavourable events. This was a longitudinal observation study. Data from herniated lumbar disc operations were retrieved from a large medical database using a combination of procedure and diagnosis codes from all public hospitals in Norway from 1999 to 2013. The impact of age, gender, geographical affiliation, education, civil status, income, and comorbidity on unfavourable events were analyzed by logistic regression.Aims
Patients and Methods
Introduction. A new interest for Metal-on-Metal (MoM) has risen worldwide. In Finland using of 28mm MoM bearings during the last years has gone up rapidly. MOM bearings in THAs are used more and more in Finland for young patients. We present short-term results of 136 MoM THAs. Patients and methods. In our Department both 28 mmMetasul- (Sulzer) ja M2a (Biomet) systems have been used. Metasul Pressfit cementless monoblock cup has titanium net on poly cup with cobolt-chrome bearing and the stem used was cementless CLS. M2a system was performed using cementless Biomet Bimetric-stem and cemented Stanmore poly cup with cobolt-chrome bearing. This series consists of 129 consecutive patients and 136 hips operated on in our department during years 2000–2002. Results. Mean age was 53yrs (20–73), BMI 27,0 (16,4–42,9). Indication was primary athrosis in 87, rheumatoid arthritis in 15, avascular femoral head necrosis in 12, dys-placia with secondary OA in 9, and other in 13. Hardinge approach was used 59 and posterior approach 77 times. Metasul was used 85 and M2a 51 times. Mean follow-up time was 20 months. Pre/postoperative HHS was 54 (23–97)/94(48–100). Leg length discrepancy 1–2,5 cm was noticed in 19 patients. 4 luxations occurred during the follow-up period. No thromboembolic or neurological complications occurred. In 5 operations peroperative fracture of trochanter major was noticed and fixed and in addition to that fissure of the femur was noticed in 5 cases; no signs of loosening was noticed in these. 2 cups had signs of loosening in all 3 zones, 11 cups in 2, and 19 in one zone. One femoral component had signs of loosening in all 7 zones, 2 in 2 zones, and 5 in one zone. Discussion. Good MoM results from 1970s encouraged us to start again to use MoM THAs in our department. At the same
Treatment by TKR of severe deformities : fixed varus or valgus knee, or flexion contracture, sometimes combined (valgus and flexed knee as for example in rheumatoid arthritis) is frequently a difficult challenge. Seldom a flessum, recurvatum or malrotation have also to be managed. These deformations, articular, extra-articular or combined can be observed in knee arthritis associated with malalignement, malunion of diaphysis, malunion of lower part of the femur or upper tibia after fracture or osteotomy, chronic juvenile arthritis or rheumatoid arthritis, Paget’s or post-rachitism disease. In 60′ and 70′ the most difficult cases have been frequently treated by hinge prosthesis with a high percentage of infection and loosening; many of the other cases treated with customary prosthesis had a poor follow-up because instability, luxation, patellar problems, pain or recurrence of the deformity. Now to obtain the best prosthesis survival rate , the well trained orthopaedic surgeon has to make a good radiographical and clinical examination and the a good planification with the good choices:. - necessity or not to perform, as a first stage, an osteotomy of femur or tibia to correct a mal-union or a deformity in frontal, sagittal or horizontal plane. - type of prosthesis ( constrained or not, PCL sparing or sacrificing, mobile bearing ),. - medial or lateral approach, and then Keblish procedure or not; tibial tubercle osteotomy or quadricepsplasty in stiff knees;. - sequence and level of tibial and femoral cuts; always perpendicular, for us, to the mechanical axis ,. - different steps of release of lateral, or medial and sometimes posterior ligamenteous and capsular elements, with many controversies for lateral compartment (iliotibial band, collateral lateral ligament, popliteus, posterolateral capsule, biceps tendon ). - necessity of medial ligament advancement or thightening when distension in severe valgus knee,. - repair of bone loss by cement, or more usually by bone graft or metal wedge. ARTICULAR OR PARA ARTICULAR DEFORMITIES. 1) FIXED VARUS KNEE. Treatment of this deformation is usually not so difficult. In case of postero-stabilized prosthesis implantation, after removal of medial condylar and tibial plateau osteophytes resection of PCL and release of semi-membranosus tendon and postero- medial capsule are performed. Pes anserinus and collateral medial ligament release creating a subperiosteal elevation of the medial envelope is sometimes needed for good soft tissue balance; in such case a constrained plateau can be useful. It is also possible to try PCL sparing but a good tightening of PCL is difficult and reconstruction by bone graft, metal wedge or cement or medial tibial plateau is in most cases necessary to protect tibial insertions of PCL. 2) FIXED VALGUS KNEE. We prefer the Keblish approach to have a direct look on the tightened formations (iliotibial band, lateral collateral ligament, popliteus. We agree with the Krackow’s classification of valgus knee in 3 groups. For group 1. , according to Whiteside it is possible to spare the PCL in the majority of cases if we accept to use a bone graft or a metal wedge on the lateral femoral condyle or/and tibial plateau taking the medial compartment as a reference.This choice of arthroplasty with PCL retention maintains the right level of the knee joint and offers often a best stability than postero-stabilized prosthesis does; PCL well tightened is a “third ligament” giving frontal stability as proved in traumatology. In fact many surgeons prefer to use postero-stabilized arthroplasty to avoid difficulties in PCL managing, and they release in different controversed steps the lateral elements. If there is instability they implant a more constrained tibial insert than usually. As communicated by Burdin it is also possible to prevent instability by performing a sagittal osteotomy of the lateral condyle around the insertions of popliteus and collateral ligament, and screw it after obtaining a good balance of the knee with the displacement of the osteotomized bone downward and/or posteriorly. For group 2. , which is caracterized by medial collateral ligament instability, it is safer to treat these knees with a postero-stabilized more or less constrained prosthesis than using a PCL sparing one and advancement of the medial ligament. For group 3. , severe overcorrection in valgus after lateral closed osteotomy for tibia varus realizes an upper tibial malunion. Prosthesis implantation is difficult: difficulties of soft tissue balance, conflict between upper tibial lateral cortex and tibial metalback stem, and bad coverage or overlapping of the tibial metalback, unless using a twisted stem. Different options can be choosen:. postero-stabilized prosthesis needs a release of lateral side; the tibial cut perpendicular to mechanical axis resecting bone to the bottom of the lateral defect takes off a too big amount of bone on the medial tibial plateau to have a safe support for metal back. If bone graft of lateral plateau is done to avoid this fact a constrained insert is potentially necessary. implantation of a PCL sparing prosthesis with also release of lateral soft tissue, and reconstruction of medial tibial plateau and eventually condylar bone loss. For stability of the knee PCL acts as a collateral ligament. correction of the deformity by a new tibial osteotomy and after its consolidation implantation of the prosthesis some months later. tibial osteotomy and prosthesis can be performed during the same operation, using a long tibial stem, cemented or not to stabilize the osteotomy site. 3) FLEXION CONTRACTURE. Correction of the deformity can be difficult when flexion is more than 30 or 40 degrees; PCL is not always an obstacle for correction. Sometimes initialy anterior bony deformity of the upper tibia has to be resected , especially in rheumatoid arthritis. After regular cut of the distal femur and removing of posterior osteophytes and loose bodies, elevation of posterior capsule from the distal femur is less dangerous than transverse incision of its middle part. If needed proximal attachements of gastrocnemius can also be stripped from the femur. Then if knee extension is not possible with trial component the tightened PCL has to be sacrified, or released or lengthened for some surgeons wanting to spare it. Finally a choice between lengthening of hamstrings and pes anserinus or a new cut of distal femur is necessary with use in some cases of a more constrained tibial plateau. For good tracking of patella lateral retinacular release is also mandatory. 4) FLESSUM, RECURVATUM, MALROTATION. Small flessum or recurvatum in metaphyseal area can be managed with the femoral anterior and posterior distal femoral cuts or tibial cut with sometimes incidence on prosthesis choice and biomechanical consequences. Malrotation around 15 degrees can also be corrected by implants positioning, and perhaps a little more than 15° using a mobile bearing prosthesis. EXTRA ARTICULAR OR COMBINED DEFORMITIES. In this type of deformity it can be necessary to perform in the same or in two separate operations its correction by a diaphyseal osteotomy preferably at the site of the deformity. It is mandatory to have a good fixation of the bone to allow a quick and strong rehabilitation of the knee after prosthesis implantation. Plating, nailing or stabilization by the stem of prosthesis can be used. At the present