The aim of the present paper was to make an objective assessment of the surgical outcome after primary knee endoprosthesis implantation by means of gait analysis.
Kinetic and kinematic parameters of gait pattern were recorded using multi-component measuring platforms integrated into a treadmill and an optoelectric measuring system. 20 patients were investigated preoperatively and on average 14 and 28 weeks postoperatively.
Preoperatively, on the affected side, the leg was used for a shorter time, but with much higher maximum forces. Mobility was reduced in the affected joint, in the adjacent hip joint, and in the contralateral joints when walking. After endoprosthesis implantation, the gait pattern approximated that of the reference group. The gait symmetry increased, and the time and force-related loading of the operated leg and the extent of mobility of the contralateral knee and both hips increased up to 28 weeks postoperatively. The clinical score according to Aichroth et al. showed a correlation with the measured values of the gait analysis at all times (p < 0.05).
Mono-articular degenerative changes of the knee have a negative effect on the function of adjacent and contralateral joints. Endoprosthesis implantation then leads to a normalisation of pathological motion patterns, both in the operated and in the adjacent and contralateral joints. However, normal values were not yet achieved 28 weeks postoperatively, which demonstrates the possibility for further functional improvement depending on the continuity of rehabilitation.