168 patients with osteomyelitis who were admitted and operated in Department of Orthopedic Surgery, Seoul National University Hospital between January in 1972 and December in 1976 ware reviewed and analized. The following results were obtained. 1. 138 strains of bacteria were isolated from 167 pus culture in osteomyelitis, about 82.6% 2. Of these, 112 strains are staphillococcus aureus. (81.2%). 3. Degrees of Sensitivity to antibiotics were as follows: in sensitive order, cephalothin was 99.0%, gentamycin 98.0%, cloxacilnli 94.5%, lincocin 92.0%, kanamycin 86.3%, streptomycin 81.2%, and chloramphenicol 80.6% was resulted, 4. Resistant rate to antibiotics were as follows: in resistant order, penicillin 88.8%, oxytetracycline 79.6%, tetracycline 76.2%, and ampicillin 72.2% was resulted.