Clinical Application And Evaluations Of Early Postoperative Therapeutic Effects Of Unicompartmental Knee Arthroplasty

Aim: Mini invasive unicompartmental knee arthroplasty (MI-UKA) provides lessinjury with no damage on the opposite compartment and the patellofemoral joint,quadriceps femoris muscle or suprapatellar bursa，fewer complications, easier revision,proprioception reservation，more bone mass reservation and a quicker recovery of jointfunction[1]. However, at present, most surgeons has little knowledge or experience onMI-UKA with little application all around the world. We conducted a study to evaluatethe application operability and early postoperative therapeutic effects of MI-UKA forthe treatment of unicompartmental osteoarthritis of knee joint.Methods: We choose all the twenty patients (24affacted knee joints) with medialcompartmental osteoarthritis of knee joint, who were treated by MI-UKA from April2013to October2013in the Department of Joint Surgery, the Second AffiliatedHospital of Dalian Medical University.These cases include4males and16females,aged54-81(69on average) years and with Body Mass Index21-33(29onaverage).Four patients(5affacted knee joints) of these cases was dignosed withpatellofemoral joint arthritis. We assessed the therapeutic effects by recording theHospital for special surgery Score (HSS） preoperatively and postoperatively.Werecorded time spended on operation, blood loss during operation, volume of drainagefrom knee joint capsule after operation. We observed whether complications such aspoor location or prosthetic displacement, loosening, periprosthetic osteolysis, linerdislocation or progressive arthritis was radiographically observed in the opposite compartment happened. We processed the data by using the SPSS19.0software andexpressed the data in the form of mean value with standard deviation. We alsoprocessed the data of HSS by the SPSS19.0software with t-text to estimate whether thedifference between HSS preoperatively and postoperatively is statistically significant.By all of these above to present the related indexes in application and early therapeuticeffects of MI-UKA in detail. We observe whether the cases with patellofemoral jointarthritis，BMI＞32kg/m2，of ages＜60or＞80years old showed difference inimprovment of HSS to estimate whether there’s difference in therapeutic effects.Results:17of the20patients were followed up for6-12months, average8.8months. One patient in the20s suffered from a poor location of the prosthesis in thefermoral side of knee joint with no release of pain or improvement in motor function;No prosthetic displacement, loosening, periprosthetic osteolysis or progressive arthritiswas radiographically observed in the opposite compartment. The average HSS scorewas improved from (55.35±2.605) preoperatively to (87.80±3.078) points in the finalfollow-up; Time spended on MI-UKA operation was (80.15±20.279) minutes; Bloodloss during operation was (13.25±5.2) ml; Volune of drainage from knee joint capsulewas (126±69.842) ml; Cases of eighteen knees (90%) showed extreme satisfaction, one(5%) showed satisfaction while none (0%) showed dissatisfaction and one (5%) showedextreme disfaction. Cases with patellofemoral joint arthritis，BMI＞32kg/m2，or of ages＜60or＞80years old showed no difference in results of HSS.Conclusion: MI-UKA is an effective treatment for unicompartmental osteoarthritisof knee joint. It gained high degree of satisfaction from the patiens with short time costfor operation procedure, little blood loss during whole peroperative period, low rate ofcomplications and excellent results in HSS.