Accelerometer-based navigation vs. conventional techniques for total knee arthroplasty (TKA): a systematic review and meta-analysis of randomized controlled trials.

Background: The aim of the study was to determine whether accelerometer-based navigation (ABN) can improve radiological and functional outcomes during total knee arthroplasty (TKA) compared with conventional techniques (CONV).

Method: We comprehensively searched the PubMed, Embase, Web of Science, Cochrane Library, and Clinical Trials databases. Only randomized controlled trials were selected for meta-analysis and, ultimately, 10 studies were included.

Results: The 10 studies involved 1,125 knees, of which 573 were in the ABN group and 552 in the CONV group. The results demonstrated that ABN significantly reduced the number of outliers for mechanical alignment (MA) (RR: 0.38, 95% CI: 0.27 to 0.54, P < 0.00001, I = 45%), achieving more accurate MA (RR: -0.78, 95% CI: -0.93 to -0.62, P < 0.00001, I = 76%). The results revealed that there was no significant difference in duration of surgery between the ABN and CONV groups (MD: -0.2, 95% CI: -1.45 to 1.05, P = 0.75, I = 48%). There was less blood loss through the use of ABN (SMD: -0.49, 95% CI: -0.93 to -0.06, P = 0.03, I = 75%). However, ABN group didn't show better knee function (SMD: 0.13, 95% CI: -0.07 to 0.33, P = 0.20, I = 0%), though the incidence of overall complications was significantly lower (RR: 0.69, 95% CI: 0.50 to 0.95, P = 0.02, I = 0%).

Conclusions: The present meta-analysis demonstrated that ABN was superior to CONV in restoring MA of the lower limb. In addition, ABN reduced the loss of blood and the duration of surgery was not prolonged. However, patient-reported outcome measurements (PROMs) were not improved.