Short-term Outcomes of Semi-constrained Implants in Patients With Complex Primary Total KneeArthroplasty

Background: semi-constrained implants are developed to reduce the detrimental impact ofconstrained implants in patients with complex primary total knee arthroplasty (tka). however,the outcomes of tka using semi-constrained implants are mainly unknown.objectives: this study aims to report the short-term outcomes and complications of primarytka in patients managed with a semi-constrained implant.methods: twenty-three patients (33 knees) who underwent tka with semi-constrained implantswere included in this study. the outcomes of patients were evaluated radiographically andclinically. clinical evaluation was performed using the knee society score (kss) and oxford kneescore (oks) at 6 and 12 months. the subjective satisfaction of the patients was also evaluatedat 6 and 12 months using yes/no questions. postoperative complications were inspected throughthe patient’s medical records.results: the study population included six men and 17 women with a mean age of 70.7±7.6years. the mean follow-up of the patients was 12.5±4.8 months. the average postoperativetibiofemoral alignment was 0.26±1.1º of valgus (ranging from 3º of valgus to 2º of varus). themean kss of the patients were 93.8±8.1 and 94.7±8.3 at 6 and 12 months, respectively. themean oks of the patients were 43.6±3.7 and 44.1±3.8 at 6 and 12 months, respectively. allpatients were satisfied with the surgery at 6 and 12 months. no postoperative complications wererecorded during the follow-up period.conclusion: the use of a semi-constrained prosthesis is safe and effective as a primary implantin tka patients having severe deformity or ligamentous laxity.