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Objective To investigate the biomechanical properties of human calcaneus by finite element method. Methods Through CT scanning, Mimics, Geomagic and other software, the finite element model of calcaneus was established. The stress distribution and displacement tendency of calcaneus under normal standing and external force were analyzed. Results Under normal standing, the calcaneal stress was uniformly distributed and small. Under external force, the entire calcaneus stress increased significantly, and the stress on calcaneocuboid articular surface also obviously increased. Conclusions The analysis of the stress and strain distribution on calcaneus in neutral position under different loading, and the investigation on biomechanical properties of calcaneus and mechanism of calcaneal fracture will provide theoretical basis for clinical treatment of calcaneal fractures.
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Objective:This study aimed to compare the clinical efficacy and prognosis between rituximab plus fludarabine and cyclophosphamide (FCR) and fludarabine and cyclophosphamide (FC) regimens for patients with chronic lymphocytic leukemia (CLL). Methods:The clinical data of 58 patients with CLL treated with FCR or FC regimens from December 2002 to January 2012 were analyzed retrospectively. Therapy efficacy and prognosis were compared between the two groups. Results:Among the 58 pa-tients, 27 (44.4%) experienced complete remission (CR) in the FCR group and 31 patients (19.4%) experienced CR in the FC group (P=0.039). The overall response rate (ORR) of the FCR group was higher than that of the FC group (81.5%and 51.6%, respectively, P=0.017). Fourteen patients achieved MRD-negative rating after therapy. PFS and OS in MRD-negative patients were superior compared with the MRD-positive group (P=0.000, 0.003). The proportion of MRD-negative patients in the FCR group was higher than that in the FC group (37.0%and 12.9%, respectively, P=0.032). PFS in high-risk genetic patients was lower than that in low-risk genetic patients (P=0.011, 0.027). The OS time between the two groups did not exhibit any difference. Conclusion:FCR produced a high CR and ORR in patients with CLL. Many patients in the FCR group were responsive to the treatment. Thus, FCR could be a more effective regimen than FC for patients with CLL.
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Objective To evaluate the efficacy and safety of imatinib in chronic myeloid leukemia (CML) patients and analyse the factors affecting the survival. Methods 135 CML patients receiving imatinib were evaluated for hematologic, cytogenetic, and molecular responses and adverse events. Results The median follow-up was 20 (range 3-67) months. The rate of cumulative complete hematological response (CHR), major cytogenetic response (MCyR), complete cytogenetic response( CCyR ) and complete molecular response (CMoR) in chronic phase CML patients were 97.9 %, 78.3 %, 72.2 % and 35.1%, respectively.These rates were significantly higher in chronic phase than in accelerated phase and blastic phase (P ＜0.001).The rate of CCyR in low-risk patients was significantly higher than high-risk patients (P =0.048). The estimated overall survival (OS) rate at 1, 3 and 5 year for chronic phase patients were (97.8±1.5) %, (95.2±2.4) % and (91.9±3.2) %, respectively. The estimated progression-free (PFS) survival rate at 1, 3 and 5 year were (92.6±2.7) %, (85.5±3.7) % and (81.3±4.3) %, respectively. The OS rate for accelerated phase patients at 6, 12 and 24 month were (93.8±6.1) %, (72.5±11.8) % and (64.5±12.9) %, the PFS rate were (92.3±7.4) %,(64.5±14.7) %, (53.7±15.7) %, respectively. The OS rate for blastic phase patients at 6, 12 and 19 month were (86.4±7.3) %, (45.4±11.4) %, (19.4±9.8) %, the PFS rate were (70.1±12.6) %, (37.6±15.6) % and (18.8±15.4) %, respectively. The OS and PFS of patients in chronic phase who achieved CCyR or CMoR were better than patients only achieved CHR (P ≤0.001). Multivariate analysis for survival of chronic phase patients indicated that imatinib resistance was the unfavourable factor for PFS (P =0.000, RR =46.744) and OS(P =0.007, RR =20.270). The non-hematological toxicity of imatinib was slight and tolerable, severe hematological toxicity was the major reason for dose reduction or drug discontinuation. Conclusion The efficacy of imatinib in chronic phase CML patients is significantly superior to which in accelerated phase and blastic phase; Achieving CCyR even CMoR is the most important thing for longer survival, iinatinib resistance is the major problem in the treatment with imatinib.