求翻译：4.2 MRI:能敏锐地发现膝关节软骨及软组织改变。当临床高度怀疑本病而X线片表现阴性时，应行膝关节MRI检查。分三种类型:(l)单纯型:软骨改变及骨质增生为主，约占40%;(2)软组织型:单纯型表现加一种软组织异常者(如侧副韧带、滑囊炎等)，约占35%;（3)骨型:以软骨下骨质改变为主，如小囊样变、片状异常信号影、骨质侵蚀等，约占25%。是什么意思？

4.2 MRI: can quickly discovered the knee cartilage and soft tissue changes. When a high index of suspicion of the disease and X-ray film showed negative, should be held in knee MRI. Three types: (l) simply type: changes in cartilage and bone hyperplasia, accounting for about 40%; (2) soft tissue: a

4.2 : MRI sensitively found knee cartilage and soft tissue changes. When clinical highly suspicious of this disease X line performance should be negative, the knee MRI inspection. divided into 3 types: (l) simply type: cartilage and bone changes, mainly hyperplasia accounted for about 40 per cent; a

4.2 MRI: Can discover keenly the knee joint cartilage and the soft tissue change.When clinical suspected highly when the book gets sick X piece performance negative, ought to do knee joint MRI inspection.Divides three kind of types: (l) pure: The cartilage change and the ossein proliferation primari

4.2 MRI: keen to discover knee cartilage and soft tissue changes. When clinic are highly sceptical when this disease and x ray film negatives, knee MRI examination. Min three species type: (l) simple type: cartilage change and the bone hyperplasia mainly, about accounted for 40%; (2) soft tissue typ

4.2 MRI: keen to discover knee cartilage and soft tissue changes. When clinical x-ray film patterns are highly sceptical of this disease, while negative, knee joint MRI examinations. Min three species type: (l) simple type: cartilage change and the bone hyperplasia mainly, about accounted for 40%; (