• Kalaivanan Kanniyan
• Shantanu Patil
• Ashok Kumar PS
• Vijay C Bose
• Suryanarayan Pitchai

AIM: To assess the role of 3D printing and 3D Models, as a part of preplanning in patients undergoing Complex Total Hip Arthroplasty (CTHA) and their functional outcome. MATERIAL AND METHODS: All cases were done in single institute which had a 3D printer facility within the campus during the period of October 2015 and October 2017 and their data with minimum follow up period of 2 years was reviewed retrospectively. A total of 10 cases were included in the study and the case distribution as per their diagnosis are 05 cases of Secondary Osteoarthritis secondary to neglected Acetabular Fracture with no signs of infection, 03 cases of Secondary Osteoarthritis following Post Acetabular Fracture Fixation with positive signs of Infection , 01 case of Neglected Acetabular Fracture with failed Post Dynamic Hip Screw osteosynthesis and positive signs of Infection and 01 case of failed Septic Revision Total Hip Arthroplasty. These 10 cases were grouped into three groups. Group A included 05 cases of Secondary Osteoarthritis secondary to neglected Acetabular Fracture with no signs of infection, Group B included with 04 cases of Secondary Osteoarthritis following Post Periacetabular osteosynthesis with positive signs of Infection and Group C included 01 case of Failed Septic Revision Total Hip Arthroplasty. RESULTS: Out of 10, 8 cases had Road Traffic Accident (RTA), 1 case had Accidental Fall and 1 case had Ankylosing Spondylitis as their etiology. All cases were males. The mean age of all the patients was 39.5yeras. The minimum follow-up period was 2 years and mean follow up period was 4.2 years. The mean 3D model making time was 8.2 hours for Group A, 6 hours for Group B and 6 hours for Group C. 5 cases of Group A underwent Complex Total Hip Arthroplasty (CTHA) done as one stage procedure. 2 out of 4 cases of Group B with normal blood parameters (ESR – Erythrocyte Sedimentation Rate, and CRP – C Reactive Protein) were done as Two stage procedure and 2 other cases with persistent infection and elevated blood markers (ESR, CRP) underwent excision arthroplasty. 1 case of failed revision arthroplasty underwent CTHA as two stage procedure. The mean operative time of final surgery was calculated and found to be 220 minutes for Group A, 160 minutes for Group B and 260 minutes for Group C. The mean blood transfusion during the final surgery was found to be of Group A - 1.2 units, Group B – 2 units and Group C – 4 units. The percentage of pre operative and intraoperative plan matching was found to be 100% cup and 90% screw in Group A, 100% cup and 90% screw in Group B and 90% cup and 90% screw in Group C. None of the patients had a reinfection. The Preoperative mean Harris Hip Score (HHS) was 50.4 and the Postoperative Harris Hip Score was 70.2 at end of October 2019. CONCLUSION: 3D printing and 3D model helped in a proper and precise preplanning, appropriate implant selection, decreased operative time, less infection rate and good functional outcome

3D Model , 3D printing , 3D printer, Complex Total Hip Arthroplasty (CTHA) , septic revision replacement , two stage septic revision, excision arthroplasty

"3D Printing and 3D Models as a part of Preplanning for Complex Total Hip Arthroplasty ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.214-218, June 2019, Available :http://www.jetir.org/papers/JETIR1908497.pdf

"3D Printing and 3D Models as a part of Preplanning for Complex Total Hip Arthroplasty ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp214-218, June 2019, Available at : http://www.jetir.org/papers/JETIR1908497.pdf