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To report the short-term clinical outcome of three cases of distal tibial osteosarcoma treated with a novel 3D-printed ankle fusion prosthesis for limb preservation. The patients were admitted to the Department of Bone Tumor, Shanghai General Hospital from January 2020 to June 2021, with one male and two female cases, aged 18, 12, and 14 years, respectively, all diagnosed with distal tibial osteosarcoma (Ennecking stage IIb). A new self-designed ankle fusion prosthesis was used to perform osteosarcoma resection and prosthetic reconstruction of the distal tibia. The operation time, blood loss, postoperative American Orthopedic Foot and Ankle Society Score (AOFAS) and ankle range of motion were recorded. All the 3 patients successfully completed the operation and were followed up for 22 months, 18 months and 12 months, respectively. The operation time was 140 min, 110 min and 200 min, and the blood loss was 200 ml, 200 ml and 350 ml, respectively. At the last follow-up, the AOFAS were 86, 90 and 95 points, and the range of motion of ankle flexion and extension were 30°, 15° and 30°. There was no local recurrence or lung metastasis at the last follow-up. The novel 3D-printed ankle fusion prosthesis in the distal tibia is safe and effective for the reconstruction of bone defects after resection of osteosarcoma in the distal tibia, and the early postoperative function is satisfactory.
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Objective:To explore the construction and application methods of multicenter bone tumor-specific database.Methods:Experts from multiple centers including Shanghai General Hospital, Shanghai Changzheng Hospital, Zhongshan Hospital, Shanghai Sixth People's Hospital, Ruijin Hospital, Fudan University Shanghai Cancer Center and Shanghai Ninth People's Hospital established a standard dataset for bone tumors through research and discussion. Clinical data will be automatically collected and standardized according to standard fields. A database will be built and a users' interface will be developed to ensure secure data storage, while providing services such as exporting raw data, visualizing statistical analysis, establishing clinical queue research projects, et al. Finally, the bone tumor database will be shared by integrating with the Shenkang's Big Data Platform to achieve multi-center data integration.Results:A standard data set for bone tumors containing 603 fields has been established and published. An automated data collection system for bone tumors has been established, including complete data collection, data collation and visualization functions. The data categories include modules such as patients' electronic case information, laboratory information on blood routine, biochemistry and tumor markers, imaging information, surgery information, pathology information and radiotherapy records. Personal information such as patients' names and ID numbers are desensitized and encrypted and can be exported for further research. From 2015 to 2023, the total number of bone tumor cases collected in the database was 10,789. From 2015 to 2019, 112 cases of the osteosarcoma cohort were retrospectively analyzed for admission, with a statistical 5-year survival rate of 68%.Conclusion:A regional bone tumor specialty big data network and data sharing platform has been established, along with data sharing mechanisms and standards including data standards, security standards, and quality evaluation standards. This provides data and efficient new solutions for the construction of China's bone tumor database, as well as a research and development platform for standardized diagnosis and treatment of bone tumors and new technologies.
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Objective:Limb salvage treatment for osteosarcoma in the distal tibiais challenging and the incidence of postoperative complications is high. To prove that the use of autologous bone inactivation to replant the ankle joint has a satisfactory clinical effect.Methods:This study retrospectively studied 6 cases (4 males and 2 females) of the osteosarcoma of the distal tibia from June 2018 to April 2019 in our center. The average case age was 16.8 years. All cases were first diagnosed in the center, and classic osteosarcoma was confirmed by biopsy. Before the operation, he received 4 courses of neoadjuvant chemotherapy. The tumor was resected under general anesthesia, and the tumor bone was inactivated and replanted for internal fixation and reconstruction. During the operation, the tumor segment was completely removed, and after a series of treatments, it was immersed in hypertonic saline at 65 °C for 45 min. After removal, the bone defect was filled with bone cement, and internal fixation materials such as plate screws and anchors were placed. Finally, soft tissue was rebuilt after the inactivated bone internal fixation complex (autograft-fixation composite, AFC) was replanted. Patients were treated with plaster for 3 months after surgery. Chemotherapy continued 2 weeks after surgery. Follow-up X-ray of the lower tibia were taken at 3 months, 6 months, and 12 months after the operation to evaluate the MSTS score and ankle function score (AOFAS) to evaluate the ankle function.Results:The patients were followed up for an average of 20 months. At 12 months after operation, no complications such as deep infection, mechanical failure of internal fixation, or local tumor recurrence occurred. The MSTS score averaged 26.7±2.6 points. The AOFAS average was 82.3±8.5 points. The VAS average is 2.7 points. Boneunionwasobserved in 5 cases during follow-up. All cases were satisfied with the treatment results.Conclusion:Limb salvage treatment of distal tibia osteosarcoma is more difficult. This study proves that the use of tumor bone inactivation and internal fixation to reconstruct the ankle joint can not only cure the tumor, but also has satisfactory limb function. It is an ideal strategy for limb salvage reconstruction.
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Objective Create patient-derived xenograft (PDX) model of bone and soft tissue sarcoma,and analyze the success rate of PDX model,observe the effects of chemotherapy on PDX models and its coincidence,and provide a theoretical basis for screening sensitive second and third line drugs.Methods Collected 31 cases of bone and soft tissue sarcoma from January 2015 to May 2016,which included 12 male and 19 female,with an average age of (28.5±19.9) y.The tumor tissue was obtained the day of operation,and it was cut into 2 mm3 pieces and injected into the flank of BAL B/C nude mice or SCID mice.Tumor was passaged when the diameter reached 1-2 cm and the P0 tissue was froze.If there was no obvious tumor mass grows out for 3 months,the model creation will be stopped.We inoculated the mice with patients sample with or without chemotherapy,observed the effect of chemotherapy on the success rate of PDX modeling and the success rate of modeling of different pathological types,and also observed the relationship between the success rate of PDX modeling and the prognosis of patients.For the drug sensitivity test,3 mice was used in each group,and chemotherapy was given,T/C was used to evaluate the inhibition ratio after drug treatment.Results 31 PDX models were inoculated.The total success rate is 45.2％.Pathology of the PDX models and their success rates:24 osteosarcoma models,success rate is 37％;2 leiomyosarcoma models,success rate is 100％;2 chondrosarcoma models,success rate is 50％;1 Ewing sarcoma model successed;1 fibrosarcoma model and 1 synovial sarcoma model,were not successed.Post chemotherapy model success rate is 33％ (4/12),compared with 53％(10/19) of model success rate that without chemotherapy.And there is relationship between success rate of PDX model creation and patient outcome.The faster the PDX model creation,the worse the outcome.The drug sensitivity of PDX model coincides the clinical situation.Conclusion The success rate of creating PDX model of bone and soft tissue sarcoma is around 30％-40％,and it is related to the pathology and whether got chemotherapy or not,PDX models coincide sarcomas clinical situation,and it is hopefully to use PDX model in selecting personalized drugs.
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Objective Investigate the surgical resection,reconstruction technique and follow-up of partly defect by primary bone malignancy in acetabulum.Methods Retrospective analysis 20 cases clinical data of partly defect by primary bone malignancy in acetabulum patients from January 2009 to January 2015.Resect the tumor and reconstruct the acetabulum based on the type of acetabulum tumor:type A,excise pubis and partial acetabulum,use self-femoral-head transplantation and pelvis reconstruct steels to reconstruct the bone defection of acetabulum leading edge,then transplant biological type acetabular cup;type B,excise ischium and trailing edge of acetabulum,transplant self-femoral-head and fixed with cancellous screw,for those can't maintain the acetabulum stabilization,apply acetabulum enhance ring to immobilize;type C,excise partial ilium and acetabulum superior margo to interrupt its discontinuity,self-femoral-head transplant to reconstruct acetabulum,then use enhance ring and cemented cup to rebuild hip joint.Results Total 20 cases,13 males and 7 females;the age ranges 23-69 years old,average 48 years;followed up 13-56 months,mean 34 months.Pathology types:17 cases of chondrosarcoma and 3 cases of malignant bone giant cell tumor.After surgery,3 cases of chondrosarcoma recurred (15％),1 case of malignant bone giant cell tumor relapsed and developed to pulmonary metastasis.2 cases of acetabulum prosthesis incipient dislocation performed closed replacement then fixed 6 weeks with hip joint brace.1 cases of prosthesis losing performed hip joint revision.1 case occurred deep hip infection,which performed debridement and taking out prosthesis.2 cases self-femoral-head transplant and biological total hip replacement healed well.Postoperative functional MSTS 93 score showed excellent in 13 cases,good in 6 cases,poor in 1 case.Conclusion According to the tumor type and range,determine the resection method and boundary,which is the key to acquire well oncological prognosis.On the premise of sufficient tumor resection,reconstruct function individually based on the type of acetabulum tumor,which is the key to acquire well functional prognosis and prosthesis survival rate.