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排序方式: 共有242条查询结果,搜索用时 130 毫秒
21.
22.
Minimally invasive total joint arthroplasty: where are we going? 总被引:1,自引:0,他引:1
23.
Survivorship analysis of total hip replacements. Results in a series of active patients who were less than fifty-five years old 总被引:3,自引:0,他引:3
C N Cornell C S Ranawat 《The Journal of bone and joint surgery. American volume》1986,68(9):1430-1434
Between 1971 and 1980, the senior one of us (C.S.R.) performed 101 primary total hip replacements in eighty-five consecutive patients who were less than fifty-five years old. All of the patients had degenerative joint disease. Survivorship analysis was used to calculate a predicted cumulative rate of success for this series of total hip replacements over ten years of follow-up. This method of analysis of the data was chosen because it provides a prediction of the expected durability of a total hip arthroplasty in any individual patient. The need for revision because of loosening or infection or else radiographic evidence of migration of a component was the criterion for failure. Two revisions were performed for aseptic loosening of the acetabular component. One infection necessitated revision, and radiographic evidence of loss of fixation was seen in one additional acetabular component and one femoral stem. Life-table calculations predicted that the survivorship of all of the total hip replacements in this series would be 87.6 per cent at ten years of follow-up. Based on the results of the application of this method of analysis to the current series, we concluded that a primary cemented total hip replacement, when performed for coxarthrosis, can be expected to function durably in an active middle-aged patient. 相似文献
24.
Michael A. Gaudiani Peter B. White Narges Ghazi Amar S. Ranawat Chitranjan S. Ranawat 《The Journal of arthroplasty》2018,33(2):590-594
Background
Bearing surface wear and osteolysis are major factors limiting the durability of total hip arthroplasty (THA). Second generation annealed highly cross-linked polyethylene (HXLPE) and ceramics were introduced to THA for their excellent wear rates. However, there is little data comparing the wear rates of metal and ceramic heads on second generation HXLPE.Methods
Sixty patients who received a noncemented THA with a 32- or 36-mm delta ceramic head were matched with 60 THAs with a 32- or 36-mm metal head based on gender, head size, follow-up, and University of California, Los Angeles activity score. Linear and volumetric wear rates were measured.Results
At mean 6-year follow-up, the mean linear wear rates were 0.012 mm/y (standard deviation [SD] 0.045; 95% confidence interval [CI] 0.001-0.024) and 0.018 mm/y (SD 0.025; 95% CI 0.012-0.025) for the ceramic and metal groups, respectively (P = .724). The mean volumetric wear rates for the ceramic and metal head groups were 11.9 (SD 43.0; 95% CI 0.7-23.0) and 17.3 (SD 23.9; 95% CI 11.1-23.4), respectively. No significant differences were detectable in either the mean linear or volumetric wear rates (P = .380 and P = .398, respectively).Conclusion
Second generation HXLPE had low wear rates and we were unable to detect a significant difference in wear rates with 32- or 36-mm metal and ceramic heads. We believe that this is due to the excellent tribological properties of second generation HXLPE. We continue to use ceramic as standard of care because of issues of trunnionosis with metal heads. 相似文献25.
Matteo Bruzzone Amar Ranawat Filippo Castoldi Federico Dettoni Paolo Rossi Roberto Rossi 《The Journal of arthroplasty》2010
The purposes of our study are to define a “danger zone” and a “safe zone” to avoid common peroneal nerve direct injury performing the “inside-out” release technique of posterior-lateral corner during total knee arthroplasty and to identify anatomic landmarks to localize the nerve before the soft-tissues release. Twenty cadaver dissections were used for testing. The distance from the nerve to the posterior-lateral corner of the tibia and to the posterior border of the iliotibial band averaged, respectively, 13.5 and 35.8 mm. The nerve is at risk during the release of the posterior-lateral capsule, in the triangle defined by the popliteus tendon, the tibial cut surface, and the most posterior fibers of iliotibial band (danger zone), but not during pie-crusting of the iliotibial band (safe zone). 相似文献
26.
27.
Cooper HJ Ranawat AS Potter HG Foo LF Jawetz ST Ranawat CS 《The Journal of arthroplasty》2009,24(5):661-667
Evaluation of pain following total hip arthroplasty (THA) can be challenging in the absence of radiographic pathology. This study aimed to examine the diagnostic utility of magnetic resonance imaging (MRI) in the evaluation of enigmatic hip pain following THA. We reviewed a series of patients who were evaluated with MRI after presenting with enigmatic hip pain following THA. MRI was able to demonstrate pathology in the periprosthetic tissues in all hips with minimal artifact. Patients underwent a range of conservative and operative interventions depending on the underlying pathology. If used discriminately in situations where pathology cannot be detected by conventional methods, MRI is a highly effective modality that can aid in the diagnosis of a wide range of disorders thereby allowing the clinician to determine the most appropriate intervention. 相似文献
28.
Material Properties of Fresh Cold-stored Allografts for Osteochondral Defects at 1 Year 总被引:2,自引:0,他引:2
Ranawat AS Vidal AF Chen CT Zelken JA Turner AS Williams RJ 《Clinical orthopaedics and related research》2008,466(8):1826-1836
Little is known about the long-term properties of fresh cold-stored osteochondral allograft tissue. We hypothesized fresh
cold-stored tissue would yield superior material properties in an in vivo ovine model compared to those using freeze-thawed
acellular grafts. In addition, we speculated that a long storage time would yield less successful grafts. We created 10-mm
defects in medial femoral condyles of 20 sheep. Defects were reconstructed with allograft plugs stored at 4°C for 1, 14, and
42 days; control specimens were freeze-thawed or defect-only. At 52 weeks, animals were euthanized and retrieved grafts were
analyzed for cell viability, gross morphology, histologic grade, and biomechanical and biochemical analysis. Explanted cold-stored
tissue had superior histologic scores over freeze-thawed and defect-only grafts. Specimens stored for 1 and 42 days had higher
equilibrium moduli and proteoglycan content than freeze-thawed specimens. We observed no difference among any of the cold-stored
specimens for chondrocyte viability, histology, equilibrium aggregate modulus, proteoglycan content, or hypotonic swelling.
Reconstructing cartilage defects with cold-stored allograft resulted in superior histologic and biomechanical properties compared
with acellular freeze-thawed specimens; however, storage time did not appear to be a critical factor in the success of the
transplanted allograft.
Each author certifies that he or she has no commercial associations (eg, consultancies, stock ownership, equity interest,
patent/licensing arrangements, etc) that might pose a conflict of interest in connection with the submitted article.
Each author certifies that his or her institution has approved the animal protocol for this investigation and that all investigations
were conducted in conformity with ethical principles of research. 相似文献
29.
30.
Keating EM Callaghan JJ Ranawat AS Bhirangi K Ranawat CS 《The Journal of arthroplasty》2007,22(3):325-333
This randomized trial assessed the effect of recombinant human erythropoietin (EPO) vs preoperative autologous donation (PAD) on postoperative vigor and handgrip strength in patients undergoing primary total joint arthroplasty. Adults with baseline hemoglobin level of 11 to 14 g/dL received EPO (600 IU/kg once weekly for 4 doses, n = 130) or PAD (n = 121) before primary, unilateral hip or knee arthroplasty. Mean changes in vigor score and handgrip strength from baseline were not significantly different between treatment groups. Multivariate analyses found a significant treatment effect favoring EPO over PAD for vigor, but not for handgrip strength. Patients in the EPO group had higher hemoglobin levels and required fewer transfusions. Both treatments were well tolerated. Additional study is needed to elucidate the influence of blood management strategies on postoperative vigor. 相似文献