自体骨髓基质干细胞复合珊瑚修复犬下颌骨节段缺损的初步研究

目的应用自体骨髓基质干细胞(bonemarrowstromalcells,BMSCs)复合珊瑚构建组织工程化骨,修复犬下颌骨节段性缺损。方法体外扩增培养、成骨诱导犬BMSCs。将第二代细胞复合珊瑚后修复犬自体右侧3cm的下颌骨节段缺损(n=6);以单纯珊瑚植入缺损处为对照(n=6),术后12、32周分别通过影像学,大体形态观察,组织学和生物力学的方法检测骨缺损的修复效果。结果成骨诱导的BMSCs在珊瑚支架上生长良好。X线片显示12周时实验组骨痂较多,对照组材料明显吸收;32周时CT、X线片和大体观察显示术后实验组骨愈合良好,对照组为骨不连;骨密度检测示实验组显著高于对照组(P<0.05);组织学示实验组有较多成熟骨呈骨性愈合,对照组为纤维性愈合;生物力学测试实验组与正常下颌骨力学强度差异无统计学意义(P>0.05)。结论自体成骨诱导BMSCs复合珊瑚形成的组织工程化骨可修复犬下颌骨节段缺损。     

复合骨形态发生蛋白(BMP)的微小颗粒骨修复兔桡骨缺损的实验研究

目的探讨自体或深低温冷冻同种异体微小颗粒骨复合胶原、骨形态发生蛋白(BMP)修复节段性兔桡骨缺损的效果。方法将兔自体或同种异体骨研磨成微小颗粒，分别与BMP及Ⅰ型胶原复合，并采用兔桡骨干1．5cm缺损的动物模型，通过X线、组织学、骨密度、生物力学等检测手段，与自体微小颗粒骨复合胶原修复节段性骨缺损的疗效比较。结果自体或深低温冷冻同种异体微小颗粒骨复合BMP胶原比自体微小颗粒骨复合胶原成骨效果优良，其中复合BMP组在8周即可使骨缺损修复，髓腔通畅，在骨缺损修复各时期，其成骨速度及成骨量均好于未复合BMP组。结论自体或深低温冷冻同种异体微小颗粒骨复合胶原BMP均可有效地修复节段性骨缺损，两种方法促进新骨形成无明显差异，异体微小颗粒骨复合胶原BMP是良好的骨缺损修复材料。     

胶原化的煅烧骨与MSCs复合修复颅骨缺损的实验研究

目的 观察骨髓基质干细胞(MSCs)/煅烧骨/Ⅰ型胶原复合物修复颅骨缺损的能力.方法 18只成年Wistar大鼠颅骨分别制作直径8 mm圆形全层骨缺损.其中6只在全身麻醉及无菌条件下取其左侧股骨,诱导培养的骨髓基质干细胞与煅烧骨/Ⅰ型胶原复合制成复合物修复颅骨缺损,为实验组;6只以煅烧骨/Ⅰ型胶原修复为对照组;6只不修复为空白组.于植入复合物后4周和8周两个时间点处死大鼠,以组织学方法 观察骨修复情况.结果 4周时实验组的植入物与颅骨缺损创缘呈骨性连接,8周时实验组植人物与创缘呈骨性连接,小梁骨增多,小梁间有较多的骨髓组织形成.对照组植入物与创缘以纤维连接为主,极少部分边缘可见骨性连接.空白组颅骨缺损面积未见明显缩小.结论 MSCs和胶原化的煅烧骨有非常好的生物相容性,复合后植入体内能够成骨,可用于颅骨缺损的修复.     

自体微小颗粒骨复合骨形成蛋白修复兔桡骨缺损

目的探讨自体微小颗粒骨复合I型胶原以及骨形成蛋白(bone morphogenetic protein，BMP)移植修复节段性兔桡骨缺损的效果。方法新西兰大耳白兔56只，切取自体髂骨研磨成微小颗粒，分别与BMP及I型胶原复合，实验分成4组（n=16)。A组：自体微小颗粒骨复合BMP、I型胶原，B组：自体微小颗粒骨复合I型胶原，C组：自体微小颗粒骨，用于修复兔桡骨干1．5cm缺损的动物模型。D组：空白对照组(n=8)，双侧桡骨缺损不作处理。术后2、4、8和12周，行X线片、组织学观察，骨密度及生物力学检测，比较各移植物修复节段性骨缺损的疗效。结果X线片显示，A组术后8周即可使骨缺损完全修复，而B组术后12周使骨缺损完全修复。术后8、12周骨量测定A组成骨量最多，12周生物力学测定显示移植物修复后的骨缺损具有最佳生物力学表现，而C组则不能完全修复骨缺损。结论自体微小颗粒骨复合BMP、I型胶原及自体微小颗粒骨复合I型胶原均能有效修复节段性骨缺损，以复合BMP移植效果更理想。     

应用瓦合式游离背阔肌肌皮瓣修复面中部肿瘤切除术后洞穿性缺损

目的：探讨应用瓦合式游离背阔肌肌皮瓣修复面中部皮肤恶性肿瘤切除术后洞穿性缺损的方法。方法：对下睑、内眦等面中部复发肿瘤进行扩大根治切除。对于切除肿瘤后形成的洞穿性缺损,应用瓦合式游离背阔肌肌皮瓣进行修复。结果：应用瓦合式游离背阔肌肌皮瓣修复面中部皮肤恶性肿瘤切除术后洞穿性缺损9例,肌皮瓣全部成活,外形良好。术后半年复查未见局部复发。3例患者于术后半年接受皮瓣去脂术。结论：应用瓦合式游离背阔肌肌皮瓣修复面中部皮肤恶性肿瘤切除术后洞穿性缺损成功率高,可达到功能和外形同时修复的效果。     

非血管化自体骨移植修复下颌骨缺损的临床研究

目的:探讨非血管化自体骨移植修复下颌骨缺损的可行性,并分析其临床疗效。方法:采用非血管化自体骨移植修复下颌骨缺损患者36例,男26例,女10例,年龄18～73岁,平均43.5岁。对36例下颌骨不同范围缺损进行一期修复,其中12例用自体肋骨修复,24例用自体髂骨修复。6个月后行二期手术种植义齿。结果:髂骨移植24例中,除1例因感染部分骨吸收外,均成活,安装义齿有咬合功能。12例肋骨移植,4例骨吸收,8例成活者中,2年后均有不同程度的骨吸收,不能安装义齿,不能承担咀嚼功能,只起到恢复外形的作用。结论:非血管化自体骨移植修复下颌骨缺损是一种较理想的修复方法,可广泛应用于临床。     

皮肤与骨骼复合缺损的修复

目的 探讨显微外科修复肢体骨与皮肤复合缺损的技术和效果。方法 39例肢体骨与皮肤复合缺损患者接受显微外科手术修复:游离移植背阔肌肌皮瓣,而后髂骨植骨4例,移植髂骨皮瓣7例,移植腓骨皮瓣6例,组合移植背阔肌肌皮瓣与游离腓骨20例,组合移植双侧背阔肌肌皮瓣与游离腓骨2例。结果 移植组织完全成活30例,9例移植的(肌)皮瓣远端皮肤发生局部浅表坏死,经换药后愈合。移植骨术后12～18周与宿主骨牢固连接。平均随访3年6个月,修复肢体均恢复有用功能。14例12岁以下儿童,修复后下肢生长正常,未发生肢体不等长现象。结论 严格手术指征,准确操作,酌情选择不同皮瓣与骨复合组织移植的显微外科修复是治疗骨与皮肤缺损的有效手段。     

皮肤与骨骼复合缺损的修复

目的：探讨显微外科修复肢体骨与皮肤复合缺损的技术和效果。方法：39例肢体骨与皮肤复合缺损患接受显微外科手术：游离移植背阔肌肌皮瓣，而后髂骨植骨4例，移植髂骨皮瓣7例，移植腓骨皮瓣6例，组合移植背阔肌肌皮瓣与游离腓骨20例，组合移植双侧背阔肌肌皮瓣与游离腓骨2例。结果：移植组织完全成活30例，9例移植的（肌）皮瓣远端皮肤发生局部浅表坏死，经换药后愈合。移植骨术后12－18周与宿主骨牢固连接。平均随访3年6个月，修复肢体均恢复有用功能。14例12岁以下儿童，修复后下肢生长正常，未发生肢体不等长现象。结论：严格手术指征，准确操作、酌情选择不同皮瓣与骨复合组织移植的显微外科修复是治疗骨与皮肤缺损的有效手段。     

胶原复合羟基磷灰石在修复下颌骨缺损中的骨动力学变化

目的 观察胶原复合羟基磷灰石（ＣＨＡ）替代自体骨修复下颌骨缺损。方法 在中国实验用小型猪的下颌骨制备直径２ｃｍ的全层骨缺损,实验组植入ＣＨＡ,对照组植入自体骨,用骨计量学方法,进行骨动力学测定。结果 实验组及对照组四环素双标记带之间的平均距离（ＤＤＬ）、矿化沉积速率（ＭＡＲ）差异显著（Ｐ〈０．０５）,而平均类骨质宽度（ＭＯＳＷ）及矿化延迟时间（ＭＬＴ）无显著差异（Ｐ〉０．０５）。表明ＣＨＡ有良好的     

引导骨再生技术对血管化组织工程骨修复兔股骨缺损过程中骨形态发生蛋白-2成骨及表达的影响

目的 探讨引导骨再生(GBR)技术对血管化组织工程骨修复兔股骨缺损过程中局部骨形态发生蛋白-2(BMP-2)的成骨量及表达的影响,以明确GBR技术在血管化组织工程骨应用中的作用. 方法 将兔自体骨髓基质干细胞经诱导后与β-磷酸三钙材料复合,植入制备的兔股骨缺损处并在材料侧槽中植入股动静脉束,其中实验组9例,血管化组织工程骨用可吸收性GBR屏障膜包裹;对照组9例,单纯植入血管化组织工程骨,分别于术后4、8、12周通过形态学检测新生骨量,ELISA法检测骨缺损局部BMP-2的表达量. 结果 随着时间进展各组成骨量逐渐增加(实验组4、8、12周时新生骨的相对面积比分别为7.31%±0.55%,35.23%±3.07%,76.09%±3.71%,对照组4、8、12周时新生骨的相对面积比分别为17.26%±1.17%,54.50%±4.26%,82.57%±4.11%,差异均有统计学意义(P<0.05);且同一时间点实验组成骨量低于对照组,差异有统计学意义(P<0.05);术后4、8、12周时实验组骨缺损局部BMP-2 OD值分别为0.334±0.012,0.245±0.008,0.172±0.009,对照组骨缺损局部BMP-2 OD值分别为0.389±0.008,0.289±0.008,0.189±0.009;术后4周时两组骨缺损内BMP-2表达量均达峰值,此后即开始出现不同程度的下降;术后4、8、12周时骨缺损局部BMP-2表达量实验组均低于对照组,差异均有统计学意义(P<0.05). 结论 GBR屏障膜会降低血管化组织工程骨修复兔股骨缺损局部的成骨量,并减少骨缺损过程中局部BMP-2的表达量.     

Latissimus dorsi flap coverage of soft tissue defect following below-knee amputation: emphasis on flap design and recipient vessels

High-energy trauma to the lower extremity often results in amputation of the limb. For maximal preservation of limb length during amputation, free tissue transfer is often necessary. In this study, we report our experience of stump coverage using latissimus dorsi musculocutaneous flaps with an emphasis on flap design and recipient vessels. Between January 2005 and September 2010, twelve patients with severe traumatic injuries to the lower leg underwent below-knee amputations with stump coverage using latissimus dorsi free flaps. The primary and secondary cases were approached differently regarding the flap design and recipient vessels. All flaps survived completely. There were 8 primary cases and 4 secondary cases. In the primary cases, the anterior tibial artery was used as the recipient vessel in 6 cases, and in 2 cases, the descending geniculate artery was used. In the secondary cases, the descending geniculate artery was used in all cases. There were two cases of ulceration on the grafted non-weight-bearing site, but after the usage of collagen–elastin artificial dermis, no ulcerations were seen. The latissimus dorsi musculocutaneous flap is the most feasible option for coverage of amputation stumps. In flap design, the width of the skin paddle must match the anteroposterior diameter of the defect at the stump. The latissimus dorsi muscle must sufficiently wrap the bony stump for padding. We recommend using the anterior tibial artery as a recipient vessel in primary cases, and the descending geniculate artery in secondary cases.     

Preserving osseous viability in osteocutaneous flap prefabrication: experimental study in rabbits

This study presents a technique that preserves osseous viability in prefabricated osteocutaneous flaps with a soft-tissue vascular carrier, with a pedicled skin flap acting as the vascular carrier to neovascularize a partially devascularized bone segment before its transfer. Using a total of 50 New Zealand White rabbits, two groups were randomized as experimental and control animals. In the experimental group (n = 30), a bipedicled dorsal scapular skin flap was anchored with sutures to the scapular bone, by bringing it into contact with the exposed dorsal surface of the bone after stripping the dorsal muscular attachments. Following 4 weeks of neovascularization, the prefabricated composite flaps were harvested, based on the caudally-based dorsal skin flap, after stripping the ventral muscular attachments of the bone. In the control group (n = 20), non-vascularized scapular bone grafts were implanted under bipedicled dorsal scapular skin flaps with sutures. After 4 weeks, prefabricated composite flaps were harvested, based on the caudally-based dorsal skin flap. In both groups, on day 7 after the second stage, the viability of the bony component of the flaps was evaluated by direct observation, scintigraphy, measurement of bone metabolic activity, microangiography, dye injection study, and histology. Results indicated that the bone segments in the experimental group demonstrated a greater survival than in the control group. The authors conclude that this technique of osteocutaneous flap prefabrication preserves the viability of the bony component with a soft-tissue vascular carrier, in contrast to the conventional method of pre-transfer grafting. The technique may be useful clinically in selected cases.     

Reconstruction of anterior chest wall defect with ceramic bone grafts--a case of localized malignant mesothelioma

The reconstruction of an anterior chest wall defect was performed on a 61-year-old male after resecting a localized malignant mesothelioma. The tumor was resected with body of the sternum, the anterior portion of the bilateral second, third and fourth ribs, muscles, subcutaneous tissue and skin. The defect was 12.5 cm x 9.5 cm in size. The reconstruction of the defect was made with Marlex mesh, two ceramic bone grafts and a latissimus dorsi musculocutaneous flap. Double Marlex mesh was sewn under the edges of the ribs and the intercostal muscles of the defect by interrupted sutures. In order to fit the ceramic bone graft to the defect transversely, two pieces of ceramic bones (Iliac crest spacers) were selected from various sizes. They were connected by a stainless steel wire through the holes which were originally made at the edge for fixation, and the connected portion was covered with methyl methacrylate. Two ceramic bone grafts were fixed to each of the stumps of the bilateral third and fourth ribs by monofilament threads. A musculocutaneous pedicle flap made from the right latissimus dorsi covered the operative filed. There were no postoperative wound infection and no extrusion of the prostheses seven months after the operation.     

Mandibular-facial reconstruction with segmentally split serratus anterior composite flaps

Oncologic or traumatic head and neck defects with missing mandible, facial skin, and oral mucosa are especially well suited to reconstruction with a composite tissue unit, based on the subscapular-thoracodorsal vessels, that carries any combination of skin, bone, and muscle to restore vascularized skeletal structures, oral lining, and skin cover. The subscapular-thoracodorsal vascular pedicles supply segmentally split units of the lower serratus muscle and ribs on which it originates. Also, one or two skin paddles for cover and lining flaps are carried either by the cutaneous scapular and parascapular branches of the circumflex scapular vessels or by surgically split segments of the latissimus dorsi musculocutaneous flap. The composite flap can be designed in a variety of combinations to meet recipient defect needs and allow retained innervated segments of the component muscles in situ for preservation of donor motor function. The common subscapular-thoracodorsal vascular pedicle can be transferred either as a microvascular free flap or by pedicle transposition through a subpectoral-subplatysmal tunnel to the mandibular-facial defect. This versatile reconstructive unit illustrates many of the refinements of contemporary flap reconstructions.     

Treatment of complex ischial pressure sores with free partial lateral latissimus dorsi musculocutaneous flaps in paraplegic patients

In paraplegic patients dependent on their upper body for mobility, the latissimus dorsi muscle is generally unacceptable for microsurgical reconstruction of complex ischial defect. To avoid total muscle function loss, a portion of the lateral latissimus dorsi musculocutaneous flap can instead be harvested. From February 1999 to March 2009, 11 paraplegic patients with complex ischial pressure sores were prospectively recruited. The reconstruction was performed using a free partial lateral latissimus dorsi musculocutaneous flap. The follow-up period ranged from 18 to 114 months (mean, 60 months). All flaps survived postoperatively. No recurrence occurred in our series. All patients experienced various degrees of back tightness, shoulder weakness and limited shoulder motion since surgery, which were relieved within 9 months. The free partial lateral latissimus dorsi musculocutaneous flap can be a good alternative for covering severe infected ischial defect. Shoulder functional deficits will lessen over time and normal function will be regained gradually.     

Use of the extended V-Y latissimus dorsi myocutaneous flap for chest wall reconstruction in locally advanced breast cancer

The extended V-Y latissimus dorsi myocutaneous flap described by Micali and Carramaschi provides an innovative method of closing large anterior chest defects after resection of breast cancer. The technique provides robust chest wall coverage that is able to withstand immediate postoperative radiotherapy. The aim of this article is to confirm the usefulness of the flap's design and describe modifications to the technique. The modifications to technique include: a curvilinear design that recruited more skin for closure in patients with wounds extending laterally or superiorly, routine transposition of latissimus dorsi insertion inferio-medially onto the chest wall to maximize pedicle reach, and the use of small split skin grafts or delayed primary closure if there was tension in closing. Twelve patients who underwent resection of locally advanced breast cancer had immediate chest wall reconstruction with the extended V-Y latissimus dorsi musculocutaneous flap. The V to Y design of the flap's cutaneous island allowed primary closure of chest wound and donor defect. There were no instances of chest wound dehiscence. The chest wounds healed, allowing patients to undergo adjuvant radiotherapy in a mean time interval of 6 weeks after surgery.     

Reconstructive methods of the antero-lateral thoracic wall after extensive surgery of invasive tumors

Local recurrence after conservative or enlarged surgery for breast carcinoma, or primary chest wall's tumors should first be approached surgically, chimio- and radiotherapy being used only later on. A precise local and general evaluation has to be made first, trying to determine whether there is or not an invasion of bony structures. When they are free of tumor, regional transfer of musculocutaneous flaps can usually cover the defect (latissimus dorsi, 1-2 rectus abdomini, pectoralis major); great omentum is used when this defect is too large. When ribs, sternum or deep structures are invaded, reconstruction uses successively: a mersilene mesh, bone cement, an omental flap covered with mesh skin grafts 2 days later. Surgical management of these difficult situations is most of the time only a palliative measure which gives these patients a better quality of life for the short time they still have got.     

The anatomy of the subscapular artery and its effects on flap design in the rabbit

The course of the subscapular artery was studied in 20 rabbits. Its course was constant, giving two branches to the latissimus dorsi muscle after which the vessel sent a branch (S1) that perforated the panniculus carnosus to supply a large territory of skin. In a separate experiment, the contribution of the S1 branch to the viability of the rabbit latissimus dorsi musculocutaneous flap was evaluated. From this experiment it can be concluded that, first, it is possible in a rabbit to elevate a large skin flap based solely on a muscle perforator (S1), which survives completely. Second, in the rabbit latissimus dorsi musculocutaneous flap, S1 is the major blood supply to the skin component. Damage to it severely diminishes skin flap survival, even if the vascular supply to the underlying muscle is completely intact.     

New options in breast reconstructive surgery: alternatives to the latissimus dorsi musculocutaneous flap

Transposition of the latissimus dorsi musculocutaneous flap is still considered by most authors a first-choice technique for breast reconstruction. However, the aesthetic drawbacks of the technique are significant: In our experience the posterior scar and the "patchlike" skin island are of concern to more than 30% of patients. Recent alternatives have sharply reduced the use of the latissimus dorsi myocutaneous flap as our first-choice technique. The utilization of a latissimus dorsi muscular flap in association with submuscular placement of a tissue expander is now our favorite technique for the majority of patients: Residual scarring is insignificant since the whole muscle can be raised through a 5-7-cm-long, S-shaped incision placed along the anterior border of the latissimus dorsi. The results obtained in a group of 35 patients demonstrate that the final results of the procedure in terms of shape and projection of the reconstructed breasts are absolutely similar to those obtained using the latissimus dorsi musculocutaneous flap. However, in patients with heavy body structure and large contralateral breast, satisfactory symmetry and a natural-looking reconstructed breast are obtained more effectively by transposition of a rectus abdominis myocutaneous flap. The precautions to be taken in order to make the procedure suitable for over-weight patients are described and the results are discussed.