The Effect Of Patellofemoral Joint Pressure On Functional Recovery After Knee Arthroplasty

Objective: To investigate the effect of patellafemerol joint contact stress on the function of knee joint。Methods: A total of 24 patients who accepted unilateral total knee arthroplasty(male 8 cases,female 18 cases)from April 2016 to December2016.To measure the PFJS in different angle of knee flexion(30°、60°、90°、120°)before and after the prothesis was replaced with pressure sensitive films.Divide into two grounps according to the indentation(the dumbbell-shaped and the comet-shaped).the situation of knee joint flexion 、kujala score、HSS knee joint score and knee anterior pain were followed up for1-1.5 years at lest,the results were statistically processed.Result: The general condition of the patient,preoperative HSS,ROM and the patellofemoral joint stress also has no obvious statistical significance,group according to indentation,14 patients into the dumbbell set,the patellofemoral joint pressure distribution is normal,imaging showed no obvious tilt,10 patients into the comet group,including 7 patients with patellofemoral pressure distribution too tends to the lateral contact surfaces,more than 3 main tending to the inside contact pressure distribution,postoperative imaging showed all patients with patellar tilt to different extent,follow-up results show two groups of patients with postoperative HSS score,ROM and knee pain,was better than preoperative,with statistically significant(p < 0.05);The dumbbell group kujala score and ROM were better than the comet group,and there was a statistical difference(p < 0.05).There was no significant difference between group HSS scores(p<0.05).Conclusion: Patellofemoral joint pressure has a certain effect on the recovery of knee joint function after TKA and the adjustment of patellofemoral joint biomechanics should be paid attention to.