翼状胬肉扩大切除联合自体角膜缘干细胞移植术的效果观察

目的：观察翼状胬肉扩大切除联合自体角膜缘干细胞移植的手术效果。

方法：将59例60眼翼状胬肉患者,随机分为A,B两组,A组27例27眼行翼状胬肉单纯切除; B组32例33眼行翼状胬肉扩大切除联合自体角膜缘干细胞移植,比较两组复发率、角膜创面愈合时间、术后泪膜恢复情况。

结果：术后随访15～25(平均18±3.6)mo,A组复发8眼(30%),B组复发2眼(6%),B组术后角膜创面愈合时间较A组缩短,泪膜破裂时间长,两组差异具有统计学意义。

结论：翼状胬肉扩大切除联合自体角膜缘干细胞移植,角膜创面愈合快,术后复发率低,是一种安全、有效的方法。     

Comparison of the Efficacy of Pterygium Resection Combined with Conjunctival Autograft versus Pterygium Resection Combined with Amniotic Membrane Transplantation

 PURPOSE:To compare the efficacy of pterygium resection combined with conjunctival autograft versus pterygium resection combined with amniotic membrane transplantation in the treatment of pterygium. METHODS:A total of 118 cases (133 eyes) were randomly assigned to receive pterygium resection combined with conjunctival autograft (n=81) or pterygium resection combined with amniotic membrane transplantation (n=52). Corneal wound healing and neovascularization and the presence or absence of conjunctival proliferation and hyperemia were analyzed at 12 months post-operatively. RESULTS:In the conjunctival autograft group, 6 eyes (7.4%) had recurrent pterygium, while in the amniotic membrane transplantation group, 10 eyes showed recurrence (19.2%, P<0.05, chi-square). Patients in the conjunctival autograft group recovered significantly faster compared with those in the amniotic membrane transplantation group. CONCLUSION:Patients receiving pterygium surgery combined with conjunctival autograft had lower recurrence rates and experience faster recovery compared with those undergoing pterygium resection combined with amniotic membrane transplantation.     

Tantalum trabecular metal – addition of human skeletal cells to enhance bone implant interface strength and clinical application

The osteo‐regenerative properties of allograft have recently been enhanced by addition of autogenous human bone marrow stromal cells (HBMSCs). Limitations in the use of allograft have prompted the investigation of tantalum trabecular metal (TTM) as a potential alternative. TTM is already in widespread orthopaedic use, although in applications where there is poor initial stability, or when TTM is used in conjunction with bone grafting, initial implant loading may need to be limited. The aim of this study was to evaluate the osteo‐regenerative potential of TTM with HBMSCs, in direct comparison to human allograft and autograft. HBMSCs were cultured on blocks of TTM, allograft or autograft in basal and osteogenic media. Molecular profiling, confocal and scanning electron microscopy (SEM) and biochemical assays were used to characterize cell adherence, proliferation and phenotype. Mechanical testing was used to define the tensile characteristics of the constructs. HBMSCs displayed adherence and proliferation throughout TTM, evidenced by immunocytochemistry and SEM, with significant cellular ingrowth and matrix production through TTM. In contrast to cells cultured with allograft, cell proliferation assays showed significantly higher activity with TTM (p < 0.001), although molecular profiling confirmed no significant difference in expression of osteogenic genes. In contrast to acellular constructs, mechanical testing of cell–TTM constructs showed enhanced tensile characteristics, which compared favourably to cell–allograft constructs. These studies demonstrated the ability of TTM to support HBMSC growth and osteogenic differentiation comparable to allograft. Thus, TTM represents an alternative to allograft for osteo‐regenerative strategies, extending its clinical applications as a substitute for allograft. Copyright © 2012 John Wiley & Sons, Ltd.     

Identification of ''short-lived'' and ''long-lived'' patients at presentation of idiopathic myelofibrosis

Mobilization of Philadelphia chromosome (Ph) negative blood progenitors was attempted in 23 newly diagnosed chronic myeloid leukaemia (CML) patients using a regimen of cyclophosphamide (CY) 5 g/m² and rHUG-CSF 150 μg/m² daily. This regimen was well tolerated with no major adverse events reported. More than 2 × 10⁶/kg CD34⁺ cells were collected in 21 patients (91%). Predominantly Ph-negative mobilization (0–25% Ph-positive) was seen in 30% of cases overall and was confined to patients with a Sokal prognostic score < 1 (7/11 with Sokal score <1; 0/12 with Sokal score ≥1). Within the low Sokal index group, a low WBC count pre-mobilization and a low WBC nadir both correlated strongly with Ph-negative mobilization ( P  =0.006 and 0.02 respectively). Five of 19 patients receiving at least 6 months of Roferon A therapy post mobilization achieved a major cytogenetic response; all five patients were Ph-negative mobilizers. Therefore CML patients can be divided into a good-prognosis group in whom predominantly Ph-negative progenitors can be mobilized using a regimen of moderate intensity if haematological control is achieved pre-mobilization, and a poor-prognosis group for whom predominantly Ph-positive cells are mobilized with this regimen regardless of haematological control.     

大规模白内障复明手术中同时行胬肉切除联合球结膜瓣转移手术的应用

目的:探讨大规模白内障复明手术中对合并翼状胬肉的患者同时施行胬肉切除联合球结膜瓣转移术的安全性和有效性。方法:对36例老年性白内障合并翼状胬肉的患者,使用前房维持器行小切口非超声乳化白内障摘除联合人工晶状体植入术,并行胬肉切除联合球结膜瓣移植,术后随访30～90(平均43.5)d。观察术后单纯球镜矫正视力、并发症、角膜愈合、角膜缘新生血管及球结膜是否有薄层胬肉样组织增生。结果:34例视力>0.3。角膜创面3～5d愈合,无1例胬肉复发,无新生血管生长及瘢痕组织增生现象。结论:防盲手术中对合并翼状胬肉的患者同时施行胬肉切除联合球结膜瓣转移术是安全和有效的。     

μCT‐Based Measurement of Cortical Bone Graft‐to‐Host Union

Evaluation of structural bone grafts risk of failure requires noninvasive quantitative predictors of functional strength. We hypothesized that a quantitative graft‐to‐host union biometric would correlate significantly with biomechanical properties as a surrogate for the risk of fracture. To test this, we developed a novel algorithm to compute the union between host callus and graft, which was termed the union ratio. We compared the union ratio of live autografts to devitalized allografts implanted into the mid‐diaphysis of mouse femurs for 6 and 9 wk. Surprisingly, the autograft union ratio decreased from 0.228 ± 0.029 at 6 wk to 0.15 ± 0.011 at 9 wk (p < 0.05) and did not correlate with the torsional properties of the autografts. The allograft union ratio was 0.105 ± 0.023 at 6 wk but increased to 0.224 ± 0.029 at 9 wk (p < 0.05). As a single variable, the union ratio correlated significantly with ultimate torque (R² = 0.58) and torsional rigidity (R² = 0.51) of the allografts. Multivariable regression analyses of allografts that included the union ratio, the graft bone volume, the maximum and minimum polar moment of inertia, and their first‐order interaction terms with the union ratio as independent variables resulted in significant correlations with the ultimate torque and torsional rigidity (adjusted R² = 0.80 and 0.89, respectively). These results suggest that, unlike live autografts, the union between the devitalized allograft and host contributes significantly to the strength of grafted bone. The union ratio has important clinical implications as a novel biometric for noninvasive assessment of functional strength and failure risk.     

Treatment of aortic valve endocarditis with the Ross operation

Objective: Standard treatment of patients with infective endocarditis is radical debridement and valve replacement, in cases with advanced pathology the treatment is usually root replacement with either a composite graft or a homograft. Enthusiasm for the use of the Ross operation in non-infective aortic valve disease is increasing, but use of the pulmonary autograft in the treatment of aortic valve endocarditis has been limited. The objective of this prospective study is to present the technique and results of our experience with aortic valve endocarditis treated with the Ross operation. Materials and methods: Since 1992 we have treated 35 patients (median age 41 years, range 6–71 years) having aortic valve endocarditis with a Ross operation. Twenty-four patients had advanced disease defined as pathology due to endocarditis extending beyond the valve cusps (13 patients) or prosthetic valve endocarditis (11 patients). Twenty-two patients had active disease at the time of surgery, and 12 had undergone one to four previous heart operations. Results: There were two operative deaths (5.8%), both related to severe disease with very advanced pathology and heart failure. Intraoperative echocardiography demonstrated no or trivial autograft insufficiency in all patients. There have been no late deaths. There has been one (probable) recurrent right-sided endocarditis in a drug addict during a follow-up period of 3–56 months. One patient has been reoperated on for homograft stenosis. Conclusions: We are enthusiastic about the use of the Ross operation in aortic valve endocarditis and in younger patients with advanced pathology, it is our preferred treatment modality. Following removal of the autograft, unparalleled exposure of the left ventricular outflow tract is obtained. Even in patients with very advanced pathology the left ventricular outflow tract is usually intact, allowing autograft implantation in the standard fashion. For selected patients with simple endocarditis, the Ross operation is an attractive option on its usual merits.     

邮票状骨膜片血肿内植入修复骨缺损的实验研究

４０只家分两组，分别探讨不同血肿及邮票状骨膜片的成骨作用及其相互影响。通过组织学、Ｘ线检查、扫描电镜、新生骨钙磷含量测定等７项检测，证明邮票状骨膜片有成骨能力。若以骨髓血为载体，其成骨能力增强。