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Material and Method: This retrospective study of patients underwent THA using short stem by a single surgeon between March 2011 and November 2012. Seventy-six patients were classified into navigated and non-navigated groups. The patient’s characteristic data that were recorded included age, sex, BMI, comorbid illness, diagnosis, ASA classification, preoperative hematocrit, operative time, type of anesthesia, intraoperative blood transfusion, postoperative length of stay, postoperative complication, and time to start rehabilitation. The data were compared between two groups by t-test and Chi-square test.
Results: There were 41 patients in the navigated THA and 35 patients in the non-navigated THA. There were 35 male patients (85.37%) in the navigated group and 27 (77.14%) in the non-navigated group. The mean age was 44.17±11.39 years in the navigated group and 44.51±8.17 years in the non-navigated group. The mean BMI was 21.77±3.09 kg/m2 in the navigated group and 22.44±4.3 kg/m2 in the non-navigated group. Most of the patients were diagnosed with osteonecrosis (more than 85% in both groups). There were no significant differences between the demographic data of the two groups except the cup abduction and anteversion angle. The mean cup abduction angle in the navigated group was 41.37±2.01 degrees and 43.97±4.44 degrees in the non-navigated group (p-value <0.01). The mean cup anteversion angle in the navigated group was 13.57±3.28 degrees and 22.58±10.68 degrees in the non-navigated group (p-value <0.01). The mean number of days from operation to rehabilitation in the navigated group was 3.27±1.83 days and 4.34±1.33 days in the non-navigated group (p-value <0.01), which was significantly shorter. The postoperative length of stay was 5.37±2.42 days in the navigated group and 5.89±1.98 days in the non-navigated group. There were two patients with minor complications after operation. There was no dislocation or infection in both groups.
Conclusion: The navigated THA procedure resulted in a significantly shorter time to start rehabilitation. The postoperative length of stay was lower in the navigated group; however, it was not significant. The navigated THA technique increased the surgeon’s confidence to provide early mobilization and rehabilitation program.
Keywords: Hip arthroplasty, Navigator, Rehabilitation, Length of stay