instruction: what is the number of times that patient 10425 had received a appl ext fix-tib/fibula on their last hospital encounter?
response: SELECT COUNT(*) FROM procedures_icd WHERE procedures_icd.icd9_code = (SELECT d_icd_procedures.icd9_code FROM d_icd_procedures WHERE d_icd_procedures.short_title = 'appl ext fix-tib/fibula') AND procedures_icd.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 10425 AND NOT admissions.dischtime IS NULL ORDER BY admissions.admittime DESC LIMIT 1)