Purpose: Immediate replacement of the mandibular condyle is sometime required when the mandibular condyle is involved in pathology. This study was designed to evaluate virtualY rib position in disarticulation resection after immediate replacement of the condyle using costochondral graft following disarticulation.   Patients  and  methods:  This  study  included 11  patients,  where  costochondral  graft  was used for immediate condylar replacement following disarticulation. Assessment was conducted immediately postoperatively by radiographic on specialized soft utilize post operative CT.   results: Eleven patients suffered from benign and locally aggressive lesions of the mandibles were presented in this study, there were no complications in all patients .Radiographic outcome showed normal position of the replaced condyle in the glenoid fossa and virtual assessment using specialized soft ware virtually . conclusions: Immediate reconstruction of the condylar unit with costochondral graft is a viable technique combining ease of surgery and a high success rate.vitual assessment help us to identify good rib position or not.