METHODS: We performed a retrospective review of 21 patients, under the age of 60 years, that underwent primary semi-constrained TKA. Patient demographics, postoperative outcomes, patient satisfaction scores, and implant loosening were reported.
RESULTS: At an average follow-up of 66 months, Knee Society Scores (KSS) and Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) scores were 94.7 and 15.7, respectively. No difference in patient reported outcomes between 1 year and final follow-up were observed. Patient demographics such as age, BMI, and gender had no effect on functional outcomes. No cases of aseptic loosening were observed. Implant survivorship, patient satisfaction, and excellent or good results were reported in 100%, 85.7%, and 92%, respectively.
CONCLUSIONS: In young patients, in which the knee cannot be effectively balanced with standard releases, the use of a semi-constrained TKA as a primary implant lead to positive patient reported outcomes and no evidence of loosening at mid-term follow-up.