Abstract
Introduction
Increasingly young and active patients are concerned about revision arthroplasty forcing the manufacturers to think about revision prostheses that fit to this population while meeting the indications and fitting with bone losses and ligament deficiencies. One of those industrials claims that its system allows the surgeon to rise the constraint from a posterior stabilized (PS) prostheses to a semi-constraint total stabilized (TS) prostheses without modifying the gait pattern thanks to a similar single radius design. The aim of the study was to compare gait parameters in patients receiving either PS or TS knee prostheses.
Methods
Nineteen patients in each groups were prospectively collected for this study and compared between each other. All subjects were assessed with a 3D knee kinematics analysis, performed with an optoelectronic knee assessment device (KneeKG®). Were measured for each knees range of motion (ROM) in flexion–extension, abduction–adduction, internal–external rotation and anterior–posterior displacement.
Results
There were no significant kinematic differences between PS and TS groups. The ROM in flexion-extension was 44° in PS group vs 46° in TS group, the ROM in internal-external rotation was 5.5° in PS group vs 4°in TS group. Peak varus angle during loading was equal (2.5°) and higher in PS group during swing phases (5.5° vs 3.7°) without any significancy. There appeared to be less antero-posterior translation in the TS group (maximum posterior displacement of −1 mm vs −5 mm) linked to the larger central post-cam without any significancy.
Conclusion
TS designed have comparable gait parameters than PS prostheses. Its use won't prejudice the patient concerning the walking pattern.
