Background: The management of ulnar styloid is often not appreciated in comparison to its larger counterpart, the radius. There are several surgical treatment recommendations such as fixation with tension band fixation or lag screw compression, and relative techniques, i.e., osteosynthesis with plates and screws. Each technique has their own advantages and disadvantages. Therefore, the researchers require scientific data that compares the three techniques biomechanically. Purpose: To evaluate the biomechanical stability of fixation with tension band wiring, lag screw compression, and plate and screw osteosynthesis. Method: Samples were randomly divided into three groups, i.e., P1 group (tension band wiring), P2 group (lag screw), and P3 group (plate and screw) and each group consisted of nine ulna bones. The fixation of the fracture fragments was completed using tension band wiring, lag screw, and plate and screw fixation. The biomechanical test is used to determine the stability of the three groups of fixation techniques. ANOVA test is used to determine the differences between each group. Result: The statistical calculation with the ANOVA test suggested that the tensile test with 150 N force results in significantly different results between fixation groups in the 10-time tensile test (p = 0.00), 20-time tensile test (p = 0.00), 50-time tensile test (p = 0.001), and 100-time tensile test (p = 0.00). This result indicates that biomechanically fixation with plate and screw is the stablest. Conclusion: Mechanically, plate and screw fixation are stabler than tension band wiring and lag screw compression in ulnar styloid fractures.

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