Computer aided analysis of biomechanical performance of schanz screw with different additive manufacturing materials used in pertrochanteric fixator on an intertrochanteric femoral fracture (corrosion resistance approach)

• Published in: International journal for numerical methods in biomedical engineering Vol. 39; no. 12; pp. e3763 - n/a
• Main Authors: Gok, Arif, Urtekin, Levent, Gok, Kadir, Ada, H. Deniz, Nalbant, Asrin
• Format: Journal Article
• Language: English
• Published: Hoboken, USA John Wiley & Sons, Inc 01-12-2023; Wiley Subscription Services, Inc
• Subjects: Additive manufacturing; additive manufacturing materials; Aged; Anesthesia; Biomechanical engineering; biomechanical performance; Biomechanical Phenomena; Biomechanics; Biomedical materials; Bone healing; Bone Screws; Bones; Complications; Computers; computer‐aided analysis; Corrosion; Corrosion resistance; Corrosion tests; Durability; Femur; Fractures; Hip Fractures - surgery; Humans; intertrochanteric fractures (ITFs); Load transfer; Manufacturing; Nickel base alloys; Older people; Performance evaluation; Pertrochanteric fixator (PTF); Regeneration; Schanz screw; Screws; Stress shielding; Superalloys; Surgical implants; Titanium base alloys; Trochanter; intertrochanteric fractures (ITFs); computer-aided analysis; biomechanical performance; Schanz screw; Pertrochanteric fixator (PTF); additive manufacturing materials
• ISSN: 2040-7939; 2040-7947
• DOI: 10.1002/cnm.3763

This study examines the use of computer‐aided analysis to evaluate the biomechanical performance of Schanz screws made from different additive manufacturing materials (Ti6Al4V, 316 L, Inconel 625, and Inconel 718) in a pertrochanteric fixator for the treatment of intertrochanteric femoral fractures. Intertrochanteric fractures (ITFs) are severe traumas often seen in the elderly population and can lead to serious consequences. The primary objective of ITF surgery is to provide stability and allow for early ambulation and rehabilitation. The Pertrochanteric Fixator is a surgical implant used to treat hip fractures near the greater trochanter, and is attached to the femur with screws. The procedure is performed under general anesthesia and typically takes 1–2 h. Possible complications include infection, nerve injury, and hardware failure. The aim of this study is to evaluate the biomechanical performance of Schanz screw using computer‐aided analysis, comparing the effects of various additive manufacturing materials including Ti6Al4V, 316 L, Inconel 625 and Inconel 718 in a pertrochanteric fixator for intertrochanteric femoral fractures. Additionally, this study will also consider the corrosion resistance of these materials to ensure long‐term durability and effectiveness in a clinical setting. The stress values mentioned for the implant materials are as follows. Ti6Al4V: 153.33 MPa, 316 L: 180.98 MPa, Inconel 625: 158.94 MPa, Inconel 718: 148.91 MPa. Higher stress values indicate a greater load transfer to the bone, which can potentially lead to stress shielding. Stress shielding occurs when an implant bears a significant portion of the load that should be transferred to the bone. This reduced stress at the fracture site can prevent the healing process, as bones require adequate stress levels for optimal remodeling and regeneration.
This study investigates the biomechanical performance of Schanz screws, manufactured from different materials (Ti6Al4V, 316 L, Inconel 625, and Inconel 718), used in a pertrochanteric fixator for intertrochanteric femoral fractures. Computer‐aided analysis is employed to assess the effects on load transfer to the bone, potential stress shielding, and corrosion resistance. The aim is to ensure the long‐term durability and effectiveness of the implants for stable fracture fixation and patient recovery.