Kevin L Ong

..8-7.9% in the remaining periods through 2 years postsurgery...

..The equatorial diameter and eccentricity, not the patient-dependent and surgical factors, explained most of the variations in the performance measures. Perfect surface apposition was not attained with any of the cup designs...

..Epidemiological study using national administrative data...

..OBJECTIVES/PURPOSES: We therefore evaluated the risk of subsequent revision after primary and revision TJA in the elderly (65 years or older) patient population and identified corresponding patient risk factors...

..0 days (median) longer and cost 108% (median) more. The greater hospital costs and hospital stay for patients needing re-operations indicate that additional medical treatment was required...

..9 and 3.8 mm-thick liners, respectively. Although pinching increases liner stresses, polyethylene fracture is highly unlikely, and the volumetric wear rates are likely to be low compared to conventional polyethylene...

..The benefits and limitations of using this technique for orthopaedic products are examined here...

..In addition, this review is based on an understanding of the causes of failure of revision hip resurfacing arthroplasty, which is essential to help guide research, implant design, and clinical decision-making...

..The remodelling of bone seen during revision of failed Birmingham hip resurfacing implants appears to be consistent with the predictions of our finite element analysis...

..Cup eccentricity was found to have no effect on implant performance. Design variables did not contribute as much to the variation in performance measures compared to the environmental variables, except for potential ingrowth areas...

..These data show bone loading and interface fixation trends emanating from valgus and varus implant positions that will be of interest to practicing physicians...

..26% for knees compared to rural (0.61% for hips and 0.69% for knees) and urban-teaching hospitals (0.73% for hips and 0.77% for knees). We found an increasing number of joint arthroplasties being diagnosed with periprosthetic infection...

..Increased pain incidence for short-stem patients may be related to decreased implant instability and increased interface relative motion...

..Although infection can be a devastating complication, due to its rarity it is difficult to characterize infection risk except in large patient populations...

..g., age, gender) vary internationally? (3) How have the rates of TKA utilization changed over time?..

..Our findings support the general belief that longer procedures are associated with the greater probability of complications...

..LEVEL OF EVIDENCE: Level II, prognostic study. See Guidelines for Authors for a complete description of levels of evidence...

..This is the first study to establish the incidence and risk factors associated with early onset and delayed periprosthetic joint infection in the Medicare patient population...

..The revision caseload of surgeons has increased over time, particularly for surgeons with the highest caseloads...

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..09%. This study established the mortality risk associated with VCFs diagnosed between 2005 and 2008 with respect to different treatment modalities for elderly patients in the entire Medicare population...

..A 10.2% failure rate 1 year after knee arthroscopy may be a reasonable benchmark against which performance of knee arthroscopy in patients older than 65 years can be measured...

..9% at 7years (HR=0.93, P<0.001). The results demonstrate the patients in the TKA cohort as having a lower probability of heart failure and mortality, at a total incremental cost of $19,843...

..Radical changes in implant design may be necessary for long-term maintenance of supporting structures in the reconstructed acetabulum...