Rinsing of allograft bone does not improve implant fixation

Background and purpose Impacted morselized allograft bone is a well-established method for reconstructing bone defects at revision surgery. However, the incorporation of bone graft is not always complete, and a substantial volume of fibrous tissue has been found around grafted implants. We hypothesized that rinsing the bone graft may improve graft incorporation by removing the majority of immunogenic factors present in blood, marrow, and fat.

Methods We implanted a cylindrical (10- × 6-mm) porous-coated Ti implant into each proximal tibia of 12 dogs. The implants were surrounded by a 2.5-mm gap into which morselized fresh frozen allograft bone was impacted. The bone graft was either (1) untreated or (2) rinsed in 37°C saline for 3 × 1 min. After 4 weeks, the animals were killed and implant fixation was evaluated by mechanical push-out and histomorphometry.

Results The groups (rinsed vs. control) were similar regarding mechanical implant fixation (mean (SD)): shear strength (MPa) 2.7 (1.0) vs. 2.9 (1.2), stiffness (MPa/mm) 15 (6.7) vs. 15 (5.6), and energy absorption (kJ/m²) 0.5 (0.2) vs. 0.6 (0.4), The same was evident for the new bone formation on the implant surface and around the implant: ongrowth (%) 6 vs. 7 and ingrowth (%) 9 vs. 9. Although not statistically significant, a 61% reduction in fibrous tissue ongrowth and 50% reduction in ingrowth were found in the rinsed group.

Interpretation Within the limits of this experimental model, we did not detect any benefits of rinsing morselized allograft bone prior to impaction grafting.     

Bacillary angiomatosis affecting the oral cavity. Report of two cases and review

Bacillary angiomatosis (BA) is an infectious disease characterized by proliferative vascular lesions; it mainly affects HIV-positive patients. Multiple cutaneous nodular lesions together with fever, chills, malaise, anorexia, vomiting and headache are the most important clinical manifestations. It may also involve the heart, liver, spleen, bones, lung, muscles, lymph nodes, central nervous system and other organs. Erythromycin, 500 mg four times a day, is the drug of choice. The importance of this lesion lies in its clinical and histological similarity with other diseases. Cutaneous and oral lesions of BA clinically resemble Kaposi's sarcoma (KS). Histopathologically, BA may be confused with angiosarcoma, pyogenic granuloma and epithelioid hemangioma. We report two HIV-positive men with BA lesions in the oral mucosa. Diagnosis was confirmed by biopsy and Warthin-Starry silver staining.     

21例后颅窝血管网状细胞瘤分析

报道21例后颅窝血管网状细胞瘤,并将其分为实质性肿瘤及囊性肿瘤两大类,分析两类肿瘤的切除率及死亡率。对复发性单纯性囊性肿瘤,提倡脑血管造影。近年来开展的脑血管造影电影技术,提高了对小脑血管网状细胞瘤的诊断与鉴别诊断,术前估计及手术效果。     

综合治疗COBB综合征一例报告并文献复习

COBB综合征是脊髓血管畸形中的一个特殊类型，又称为皮肤脊椎脊髓血管畸形（cutancous veriebral medullary angiomatosis），是同一椎体节段先天性外胚层，中胚层和神经组织的血管发育畸形。以同一椎体节段的皮肤、骨髂、脊髓的血管畸形为特点。临床非常罕见，迄今国内外文献报告的COBB综合征只有30余例。     

脑颜面血管瘤综合征的CT表现(附8例报告)

目的 结合病理分析脑颜面血管瘤综合征的CT特点。资料与方法回顾分析8例脑颜面血管瘤综合征的临床和cT资料。结果脑颜面血管瘤综合征8例CT影像均有特征性表现，为一侧或两侧顶枕叶或额顶颞枕叶表浅部位的脑回状或弯曲条带状钙化伴病侧大脑半球发育不全或萎缩。同时合并脑软化灶者2例，合并同侧颅骨增厚者2例。结论 CT能够很好地显示脑颜面血管瘤综合征的宽大脑回状及弯曲条带状钙化的特征。诊断具有特征性。     

Soft-tissue angiomatosis in adulthood: a case in the forearm showing a prominent myxoid adipose tissue component mimicking liposarcoma

Soft-tissue angiomatosis is a rare condition characterized by diffuse proliferation of benign vascular structures, accompanied by mature adipose tissue, which affect a large segment of the body in a contiguous fashion. Most patients present in childhood or adolescence. We report a case of large soft-tissue angiomatosis, located in the left forearm of a 65-year-old man, which showed extensive intramuscular and intermuscular infiltration, and embracement of the radius and the main vascular and neural bundles of the forearm. Due to the deep location, large size, ill-defined limits and non-homogeneous composition with areas suggestive of an adipose component in the radiological examination, the lesion raised the possibility clinically of a liposarcoma. The myxoid adipose tissue component of the lesion, a feature previously undescribed, and the predominance of small, capillary-sized vessels were considered concordant with the clinical diagnosis. This presentation is rare. The features of the lesion made complete surgical excision impossible and amputation of the extremity was considered the best treatment. The main differential diagnoses include infiltrating lipoma, myxolipoma, angiomyxolipoma, angiolipoma, intramuscular angioma, liposarcoma and low-grade myxofibrosarcoma. In conclusion, angiomatosis might simulate liposarcoma, particularly if the mass is large, heterogeneous, myxoid and appears later in life.