Gait Analysis of Patients With a Rotating Hinge Knee Prosthesis After Revision Total Knee Arthroplasty

Background/Objective: The number of revision total knee arthroplasty (TKA) procedures performed worldwide is increasing. The rotating hinge knee type (RHK) is used for revision TKA. There has been no report on motion analysis of patients with RHK prosthesis. Therefore, this study aimed to clarify the kinetics and kinematics during gait in patients who underwent revision TKA with an RHK prosthesis.Methods: This study had a cross-sectional design. The patients who underwent revision TKA with an RHK prosthesis (R-RHK; 14 patients, 24 knees), those who underwent unilateral primary TKA with a cruciate-retaining (CR) type prosthesis (uniCR; five patients, 5 knees), and those who underwent bilateral primary TKA with a CR type prosthesis (bilCR; 10 patients, 20 knees) were included. Their comfortable gait was analyzed. Spatiotemporal parameters and knee joint angle and moment were calculated. The knee joint angle and tibia translation were compared among the three groups using analysis of variance and a post-hoc Tukey test. The knee adduction moment was compared between groups by analysis of covariance controlling for gait speed.Results: Gait speed of the R-RHK group was significantly less than that of the other groups. The knee joint angle, knee adduction moment, and tibia translation were not different between the R-RHK, uniCR, and bilCR groups during gait and at the beginning of the stance phase.Conclusions: The gait of patients undergoing revision surgery using an RHK prosthesis because of aseptic loosening may have the same biomechanics as that of patients undergoing primary TKA using a different type of prosthesis.