The influence of posterior tibial slope on the mid-term clinical effect of medial-pivot knee prosthesis

Abstract

Objective To evaluate the effect of posterior tibial slope (PTS) on the mid-term clinical outcome following a medial-pivot (MP) prosthesis. Method Two hundred thirty-three patients from The Affiliated Hospital of Qingdao University, who had undergone a total knee arthroplasty (TKA) with MP prosthesis between January 2015 and December 2015, were retrospectively included in this study. They were divided into 3 groups according to postoperative PTS: A ≤ 5°; B 5-7°; and C ≥ 7°. 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. Results The average post-operative ROM for groups B and C were 108° and 110° respectively; this was significantly higher than that of group A (98°, P < 0.001). The WOMAC scores of patients in group C were significantly lower than those in groups A and B (P < 0.05). However, there were no significant differences in KSS, PCO, and joint line height among the 3 groups (P > 0.05). Only 2 cases of postoperative complications occurred in group C, these were ameliorated after operation. Conclusion With an increase to PTS, the postoperative ROM can be significantly increased for the patient. However, the knee joint function will not be significantly improved, and the stability of knee joint will not be affected when within the limits of appropriate PTS.

The effect of posterior tibial slope on anteroposterior stability in posterior cruciate retaining total knee arthroplasty

“…It is generally believed that knees with a greater tibial slope have greater knee flexion [ 16 , 17 ]. Although many articles in the literature found a correlation between the increase in PTS and maximal flexion, we could not find a relationship between PTS and maximal flexion in our study.…”

Safety and Efficacy of Single Condylar Knee Prosthesis When Treating Knee Single Compartment Osteoarthritis: A Prospective, Case-Randomized Controlled Study

“…Single ankle replacement for knee joint single compartment osteoarthritis has been favored by the majority of knee surgeons because of its obvious advantages and characteristics, such as less surgical trauma, short operation time and hospital stay, low hospitalization cost, satisfactory short-term effect, and so on. Riddle et al reported that the number of American condylar knee prosthesis replacement increased by an average of 32.5% per year from 1998 to 2005 [ 23 ]. More and more researchers have believed that condylar knee arthroplasty can relieve pain and improve the quality of life of patients with osteoarthritis in single compartment, especially in medial compartment [ 24 – 32 ].…”

Comparison of the Tibial Posterior Slope Angle Between the Tibial Mechanical Axis and Various Diaphyseal Tibial Axes After Total Knee Arthroplasty

“…Because the long radiograph is often used in more difficult cases, LSKRs are frequently used in daily clinical practice during postoperative follow-up periods because of logistical and technical problems [ 7 ], convenience, and lower cost [ 8 ]. Even recent studies [ 9 , 10 ] have evaluated the PTS after TKA using LSKR. However, the PTS using LSKR should be regarded as the estimation of the true PTS using FLTR as LSKR without the ankle plafond cannot determine the mechanical axis of the tibia.…”