- V. Alivizatos, G. Petsinis, G. Siaveli, N. Apostolopoulos, V. Athanasopoulos : Central venous catheter – related sepsis in surgical patients treated with total parenteral nutrition. 7th International Congress for Infectious Diseases,
- Alivizatos, N. Apostolopoulos, F. Karvelas, G. Petsinis, G. Siaveli, V. Athanasopoulos : Protein catabolism after open and laparoscopic cholecystectomy. European I.H.P.B.A. Congress, Hamburg, June 8-12, 1997.
- Korovessis, A. Baikousis, G. Petsinis : The use of TSRH instrumentation in the treatment of thoracolumbar injuries. 1st Interbalkan Congress on Spinal Diseases, Athens 7-9 May, 1998.
- Korovessis, M. Pfeiffer, P. Griss, Α. Baikousis, M. Stamatakis, G. Petsinis : Short term results after posterior spinal fusion with DDS. 2nd Combined Meeting of European Spine Society & European Spinal Deformities Society. Innsbruck, (page 60), Austria, June 23-27, 1998.
- Baikousis A., Korovessis P., Stamatakis M., Petsinis G. : Texas Rite Hospital Instrumentation for correction of idiopathic scoliosis . Short-term results. 4th EFORT, Brussels, June 3-8, 1999.
- Stamatakis M., Korovessis P., Baikousis A., Petsinis G. : Primary results with the use of compression cerclage (CCG) Gundolf in orthopaedic and trauma surgery. 4th EFORT, Brussels, June 3-8, 1999.
- Petsinis G., Korovessis P., Stamatakis M., Baikousis A. : Medium-term results with Zweymueller total hip arthroplasty in dysplastic and congenitally dislocated hips. 4th EFORT, Brussels, June 3-8, 1999.
- Papazisis Z., Korovessis P., Petsinis G., Baikousis A. : Rigid vs Semirigid fixation of lumbar spine in degenerative lumbar disease. A correlative radiological analysis of the sagittal profile. International Research Society of Spinal Deformities Meeting (ABSTRACT Booklet) France, May 26-30, 2000.
- Baikousis A., Korovessis P., Petsinis G., Papazisis Z., Katonis P. : Posterior CCD for occipitocervical, cervical & cervicothoracic fusion. 5th Congress EFORT, (Page 16), Rhodes, Greece, June 3-7, 2001.
- Baikousis A., Korovessis P., Petsinis G., Papazisis Z. : Effects of TLSO on spinal deformities, trunk asymmetry and frontal lower rib cage in adolescent idiopathic scoliosis. 5th Congress EFORT, (Page 90), Rhodes, Greece, June 3-7, 2001.
- Korovessis P., Deligianni D., Petsinis G., Baikousis A., Papazisis Z. : Comparative strength measurements of five different fixation systems applied on an in vitro model of femoral midshaft osteotomy. 5th Congress EFORT, (Page 101), Rhodes, Greece, June 3-7, 2001.
- Papazisis Z., Korovessis P., Petsinis G., Baikousis A. : Prediction of thoracic kyphosis with the use of the Debrunner’s Kyphometer. 5th Congress EFORT, (Page 139), Rhodes, Greece, June 3-7, 2001.
- Korovessis P., Deligianni D., Petsinis G., Baikousis A. : Comparative strength measurements of conventional vs. titanium cerclage osteosynthesis. 6th Congress EFORT, Helsinki, Finland, June 4-10, 2003.
- Korovessis P., Petsinis G., Repanti M. : Successful implantation and course of Zweymueller-SL Metal-on-Metal THA. 6th Congress EFORT, Helsinki, Finland, June 4-10, 2003.
- Korovessis P, Huber JF, Petsinis G et al. Comparative analysis of the surgical outcome following decompression and stabilization with the use of SF-36 in two ethnic different populations from North and south Europe. SPINE WEEK 2004, Porto Portugal May 30- June 05, 2004.
- G Petsinis, M Repanti, S Zacharatos, P Korovessis : Zweymueller with Metal-on-metal Articulation Clinical, Radiological and Histological Analysis Five to nine Years. 7th EFFORT, Lisabon, June 4-7, 2005.
- Koureas G., Zacharatos S., Papazisis Z., Petsinis G., Korovessis P. Correlative Radiological, Self-Assessment and Clinical Analysis of Evolution in Instrumented Dorsal and Lateral Fusion for Degenerative Lumbar Spine Disease. Autograft Versus Coralline Hydroxyapatite. 7th EFFORT, Lisabon, June 4-7, 2005.
- Baikousis A, Koureas G, Petsinis G, Zacharatos S and Korovessis P. Combined anterior plus posterior stabilization vs. posterior stabilization and fusion in the treatment of lumbar burst fractures. 7th EFFORT, Lisabon, June 4-7, 2005.
- Korovessis, G. Petsinis, S. Zacharatos: Combined anterior and posterior stabilization vs. posterior stabilization and fusion in the surgical treatment of burst lumbar fractures. 10th International Argos Symposium, Paris, France, 26-27 January, 2006.
- Petsinis, S. Zacharatos, P. Korovessis: Radiographic and clinical results of balloon kyphoplasty for the treatment of pathologic vertebral compression fractures. 10th International Argos Symposium, Paris, France, 26-27 January, 2006.