Posterior Tibial Slope Influences on the Mid-Term Clinical E
A Study was conducted to evaluate the effect of posterior tibial slope (PTS) on the mid-term clinical outcome following a medial-pivot (MP) prosthesis.

233 patients who had undergone a total knee arthroplasty (TKA) with MP prosthesis were included in this study. They were divided into 3 groups according to postoperative PTS. Multiple assessments were made on the patient postoperatively and recorded in the three groups, the measurements of this study included: the range of motion (ROM), knee scoring system - KSS, Western Ontario and McMaster universities osteoarthritis index (WOMAC), posterior condylar offset (PCO), joint line height, and postoperative complications.

--The average post-operative ROM for groups B and C were 108° and 110° respectively; this was significantly higher than that of group A.

--The WOMAC scores of patients in group C were significantly lower than those in groups A and B.

--However, there were no significant differences in KSS, PCO, and joint line height among the 3 groups.

--Only 2 cases of postoperative complications occurred in group C, these were ameliorated after operation.

Conclusively, by increasing PTS, the patient's postoperative ROM can be greatly boosted. When used within the boundaries of proper PTS, however, the function of the knee joint will not be greatly improved, and the stability of the knee joint will not be impacted.