Neoplastic involvement of the sacroiliac joint: MR and CT features

The radiological findings in five patients with pelvic sort tissue neo plasms directly involving the sacroiliac joint, are described. All patients had Computed Tomography (CT) examinations, two of the patients also having Magnetic Resonance Imaging (MRI). The role of imaging in this uncommon entity is discussed as well as the importance of making this diagnosis, thereby excluding unilateral sacroiliitis. The therapeutic implications of this diagnosis relate to local neural involvement, especially the sciatic nerve, and the fact that involvement of the sacroiliac joint by tumors significantly compromises chances of a successful surgical outcome. The role of MR in this condition is not yet certain, but it may prove to be the method of choice in view of its excellent depiction of skeletal neo plasms.     

用带血管的腓骨近段重建桡腕关节的临床研究

用绘图法对１５具尸体１５对腓骨小头的胫腓关节面及桡骨腕关节面进行了解剖学的对比研究，观察关节面形态，测量其长径、横径、关节面倾斜角度、曲率半径，发现腓骨小头的胫腓关节面和桡腕关节面解剖相似。在此基础上，临床应用带血管腓骨近段移植重建桡腕关节４例收到良好的疗效，根据Ｇｒｅｅｎ评分标准，腕关节评分为７０～８５分。     

膝关节 Q 角变化规律的实验研究

本研究利用精密三维位移测读仪，研究分析了Ｑ角的变化趋势，以及对髌股关节运动的影响。研究结果表明，Ｑ角是一空间夹角，随屈膝角的增大而增大。力线在平面上的投影所呈的平面夹角Ｑｐ也就是通常所指的Ｑ角，在屈膝１５°左右达最大，而在９０°左右达最小。整个屈膝过程中，ＱＰ在５°－１５°之间变化，变化幅度达１０°左右。     

Dislocation of the second through fifth carpometacarpal joints

We report a case of dislocation of the second through fifth carpometacarpal joints and review the mechanism of injury and radiographic findings in such injuries.     

C型臂X线机引导下经皮双侧骶髂拉力螺钉固定治疗骶骨H形骨折

目的探讨骶骨H形骨折可行的治疗方法。方法运用C型臂X线机引导下经皮双侧骶髂拉力螺钉固定治疗骶骨H形骨折15例。结果15例患者均获随访，随访时间7—34个月，骨折临床愈合时间3～5个月，术后均未留下明显行走障碍，下蹲等活动接近正常。结论在C型臂X线机精确引导下，经皮双侧骶髂拉力螺钉固定技术能有效地固定骶骨H形骨折中的垂直骨折，纠正骨盆垂直方向移位，操作简洁安全，疗效可靠。     

羊间接性颞下颌关节损伤后髁突软骨中基质金属蛋白酶-3表达及其意义

目的 探讨基质金属蛋白酶-3(matrix metalloproteinase-3，MMP-3)在羊颞下颌关节((temporomandibular joint，TMJ))间接创伤后骨关节病发生中的作用。方法 用自制撞击装置造成山羊双侧颞下颌关节间接性创伤，分别于伤后1周、1，3，6个月取TMJ髁突软骨，并以正常TMJ作为对照，用免疫荧光组织化学方法观察MMP-3的表达。结果 TMJ髁突软骨中MMP-3伤后1个月表达开始增强，后期进一步增强；荧光着色于软骨破坏区及增生的滑膜样组织、软骨肥大带及骨髓内较强，正常对照组基本呈阴性反应。结论 MMP-3参与了TMJ创伤所致TMJ骨关节病过程，并起了重要作用。     

板股韧带的MRI研究及临床意义

目的　明确板股韧带正常MRI表现 ,建立由它所致假撕裂与外侧半月板后角真撕裂的鉴别方法。资料与方法　采用 6 0侧正常膝进行矢状和冠状位MR扫描 ,观察板股韧带的MRI表现。结果　板股韧带显示率为88.3% (5 3侧 ) ,其中板股前韧带为 2 6 .7% (16侧 )、板股后韧带为 86 .7% (5 2侧 )和两条韧带同时存在为 2 3.3% (14侧 )。板股韧带在矢状像上表现为位于后交叉韧带前或后方的类圆形或短棒状低信号结构 ,而在冠状像上表现为自外侧半月板后角至股骨内侧髁外侧面的条带样低信号结构。在矢状像上 ,5 2 .8% (2 8/5 3)板股韧带与外侧半月板后角之间显示出一线样高信号 ,被称为假撕裂 ,易与外侧半月板后角撕裂混淆。但假撕裂仅有两种走行方向即后下斜行 (2 1/2 8)或垂直方向 (7/2 8)。结论　根据假撕裂位置、方向以及冠状像和连续矢状面的观察 ,可正确区分外侧半月板后角真假撕裂     

Rotational acetabular osteotomy for acetabular dysplasia of the hip with a giant acetabular bone cyst: a case report

In acetabular dysplasia of the hip joint accompanied by a giant acetabular bone cyst, rotational acetabular osteotomy may cause serious complications, such as bone necrosis after surgery or fracture of the fragile acetabulum during the operation. In a patient with this condition, we performed a two-stage operation: first, autogenous bone grafting supplemented with hydroxyapatite filling, then rotational acetabular osteotomy (after new bone formation had been assured). Radiographs and CT scans showed favorable fusion of the grafted bone. Some 18 months after the second operation, arthrograms showed no inflow of contrast medium from the articular cavity into the bone cyst region, although this had been observed before treatment. Thus, an effective remodeling of bony congruency was indicated in the mobile acetabulum 5 years after the second operation. This two-stage operation appears to be useful for correcting acetabular dysplasia accompanied by a giant bone cyst and to carry a reduced risk of serious complications, such as deterioration of the articular surface of the acetabulum or necrosis of the translocated acetabulum.