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Initial results in restoration of some anatomical dimensions in standard cementless total hip replacement

Objective: To give initial results in the restoration of some important anatomical parameters (femoral neck angle, distance from the center of the crest to the femoral axis (offset), and limb deviation) in the standard cementless total hip replacement in the treatment of aseptic necrosis of the femoral head. Subject and method: In studies in the period from 2/2021 to 6/2021, the authors used the Medi-CAD software integrated on the computer to determine the femoral neck angle, the distance from the center of the crest to the femoral axis (offset), the limb deviation of 24 hip joints was surveyed on 20 patients at the time preoperative and postoperative with standard Zimmer hip joints. The method used in this study is a cross-sectional, prospective study. Result: The results show that the mean postoperative femoral neck angle was 131.1 ± 3.2º while the preoperative size was 129.8 ± 3.4º. The average postoperative offset size was 35.6 ± 4.8mm and higher than before surgery was 32.5 ± 5.4mm. Postoperative limb deviation was 3.2 ± 2.7mm and lower than preoperative was 12.3 ± 4.5mm, the difference was insignificant statistically. Conclusion: Research results show that the closer the femoral neck angle and the offset is to the original value, the better the limb balance.