The magnetic resonance imaging diagnosis of acute patellofemoral joint impingent
- VernacularTitle:急性滑脱性髌股关节撞击症的认识与MRI诊断
- Author:
Zhi WANG
;
Linsen WANG
;
Yongcheng HU
- Publication Type:Journal Article
- Keywords:
Knee joint;
Patella;
Wounds and injuries;
Magnetic resonance imaging
- From:
Chinese Journal of Orthopaedics
1999;0(07):-
- CountryChina
- Language:Chinese
-
Abstract:
Objective Lateral dislocation of the patella pulled laterally from the trochlea and across the lateral femoral condyle,was often a transient phenomenon with spontaneous reduction,diagnosis based on the results of physical examination and clinical history was difficult.The present was in an effort to explore the mechanism and definition of acute patellofemoral dislocation as well as assessment with MRI of the injury.Methods From May2001to July2002,34patients aging from11to25years with18males and16females,had a history of knee joint,28of which were experienced a twisting injury with the knee in flexion and internal rotation of femur on a fixed foot.Sagital,coronal and transverse MRI were performed with T 1 WI,T 2 WI,STIR and TSHIRT sequences.The manifestations of MRI were analyzed retrospectively,and clinical data,X-ray films,CT scan and the findings of arthroscopy were studied as well.Results All of34cases injured were found the signal intensity abnormalities of subchondral bone in the inferior medial part of patella and the anteri-or lateral part of lateral femoral condyle,which suggested that bone was injured.MRI findings of cartilage fis-sure at medial patella were found in20cases and injury of the patella retinaculum was seen at MRI in27cas-es.MRI findings revealed joint effusion in all patients,and lateral subluxation of the patella was seen at MRI in23cases.Conclusion The resultant jury on MRI findings of acute patellofemoral joint dislocation caused by a-cute impingent of patellar medial facet to lateral femoral chondyle at the various degree of flexion and rotation of the knee include the osteochondral fracture in the inferior medial part of patella,the anterior lateral part of lateral femoral condyle,the subluxation or dislocation of patella,the injury of medial patella retinaculum and the joint effusion.MRI could be helpful for the diagnosis of the disease,and demonstrate the location and ex-tent of injury on the different compartments of the involved knee.
