Patellar dislocation following distal femoral replacement after extraarticular knee resection for bone sarcoma:A case report  

作　　者：Yuta Kubota Kazuhiro Tanaka Masashi Hirakawa Tatsuya Iwasaki Masanori Kawano Ichiro Itonaga Hiroshi Tsumura 

机构地区：[1]Orthopaedic Surgery,Oita University,Yufu City 879-5593,Oita,Japan

出　　处：《World Journal of Clinical Cases》2022年第11期3561-3572,共12页世界临床病例杂志

摘　　要：BACKGROUND For the treatment of bone sarcoma in the distal femur,wide-margin resection and knee reconstruction with tumor endoprosthesis are standard therapies.Extraarticular knee resection is required in cases of tumor invasion of the knee joint;however,the incidence of complications,such as aseptic loosening,prosthesis infection,and implant failure,is higher than that following intra-articular knee resection.To the best of our knowledge,there are three reports of patellar dislocations after replacement of a tumor endoprosthesis.CASE SUMMARY A 36-year-old man with no significant past medical history was admitted to our institution with continuous pain in his left knee for 4 mo.An open biopsy was performed,and the patient was diagnosed with a left distal femoral malignant bone tumor.Extra-articular knee resection and knee reconstruction with a tumor endoprosthesis were performed.Although the alignment of the tumor prosthesis was acceptable,knee instability was noticed postoperatively.The axial radiographic view of the patellar and computed tomography showed lateral patellar dislocation at 4 wk postoperatively.The patient had to undergo a lateral release and proximal realignment.He could perform his daily activities at 9 mo postoperatively.Radiography revealed no patellar re-dislocation.CONCLUSION Proximal realignment may be considered during primary surgery if there is an imbalance in the forces controlling the patellar tracking.

关 键 词：Bone tumor Distal femoral replacement Lateral release Patellar dislocation Proximal realignment Case report 

分 类 号：R738.1[医药卫生—肿瘤] R687.4[医药卫生—临床医学]