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Background Total hip arthroplasty (THA) is the most successful orthopaedic surgery of the past century. The current study aimed to compare the accuracy of digital planning using 2D versus 3D templating. Materials and methods Ninety-five THAs in 90 patients were included in the current study. Pre- and post-operative X-rays (in two planes) and low-dose rotation computed tomography scans from hip to foot were performed. Paired  t -test and regression analyses were conducted to compare 2D and 3D templating accuracy of the definitive implant. Results Cup size planned both with 2D ( p  &lt; 0.0001) and 3D ( p  = 0.012) templating was significantly different from the definitively used cup size. The difference between the 2D-planned and implanted stem size ( p  &lt; 0.0001) was statistically significant. In contrast, there were no significant differences in the 3D-planned and implanted stem size ( p  = 0.181). Three-dimensional templating showed significantly higher accuracy than 2D templating in terms of cup size (1.1 ± 1.4 versus 1.7 ± 1.8;  p  = 0.007) and stem size (0.3 ± 0.6 versus 0.7 ± 0.7;  p  &lt; 0.0001). With increasing body mass index (BMI), 2D templating of the stem became more inaccurate ( p  = 0.041). Remarkably, 3D templating remained accurate for all components (stem,  p  = 0.533; cup,  p  = 0.479) despite increasing BMI. Conclusion Despite extended planning time and increased exposure to radiation, 3D-based planning showed higher accuracy than 2D templating, especially in obese patients. On the basis of our results, we believe that 3D-based pre-operative planning in THA is justifiable and beneficial in patients with increased BMI. Level of Evidence III.

Pre-operative templating in THA using a short stem system: precision and accuracy of 2D versus 3D planning method