Effect of Posterior Tibial Slope Change on Joint Function and Prosthesis Survival Rate after Unicompartmental Knee Arthroplasty
Objective To investigate the influence of posterior tibial slope(PST)changes on knee function and prosthesis survival after 3rd generation Oxford unicompartmental knee arthroplasty(UKA).Methods The clinical data of 194 patients(206 knees)admitted to our institution for medial UKA from January 2017 to August 2021 were retrospectively analyzed.The groups were divided according to the the difference in preoperative and postoperative changes in PTS:60 cases(63 knees)with PTS increased＞2°in group A,101 cases(108 knees)with PTS changed≤2°in Group B,33 cases(35 knees)with PTS decreased＞2°in group C.The knee joint function was evaluated using the Hospital for Special Surgery(HSS)score,Oxford Oxford knee score(OKS)and the range of motion(ROM).The postoperative complications of 206 knees were analyzed and the Kaplan-Meier method was used to evaluate the prosthesis survival rate.Results All three groups achieved good knee joint function after surgery.There was no significant difference in HSS,OKS and ROM among the three groups before surgery(P＞0.05).At the last follow-up,there was a significant difference in HSS and OKS among the three groups(P＜0.05).The HSS in the group B was higher than that in the groups A and C,while the OKS score was lower in the group B than in the groups A and C.However,there was no statistically significant difference in ROM among the three groups(P＞0.05).A total of 7 complications occurred in 206 knees,including one case in group A(a dislocation of polyethylene liner),3 cases in group B(medial tibial plateau collapse,polyethylene pad dislocation,and tibial plateau prosthesis loosening),3 cases in group C(progression of lateral compartment osteoarthritis,loosening of tibial plateau prosthesis,and dislocation of polyethylene pad).The incidence of complication was 8.57％in group C＞2.78％in group B＞1.59％in group A.The survival rate of the 206 knee prosthesis was 96.6％.Conclusion The choice of the postoperative PTS must be individualized and precise.The PTS change of≤2°before and after surgery can enable patients to achieve better knee joint function and clinical efficacy.
万方数据
维普
