KNEE DEFORMITIES AND KNEE REPLACEMENTS IN SAUDI POPULATION: OUR EXPERIENCE AND LITERATURE REVIEW

It takes precise alignment, adequate balance, and deformity correction to accomplish a successful total knee arthroplasty (TKA). In main TKA, this can be successfully achieved with a posterior stabilized (PS) design, either with or without sub-periosteal release. However, severe abnormalities with a major bone defect, stiffness, and instability are often associated with these disorders in some circumstances, such as knee osteoarthritis. Additional restrictive prostheses are required since it is extremely difficult to balance these anomalies with soft tissue release alone, even after main TKA. In this situation, the constrained condylar knee (CCK) design is the optimum choice. This studys primary objectives were to characterize the clinical outcomes, function recovery, and complications of patients who underwent primary CCK-TKA for severe knee osteoarthritis related knee deformity. The secondary aim was to find out the mid-term prostheses survival. Methods: Between March 2021 and March 2022, 36 consecutive patients with knee osteoarthritis had cemented primary CCK-TKA. Twenty-Eight women and eight men, totaling 36 patients, had at least a 6 month follow-up for this retrospective analysis. We used the Knee Society Score (KSS), the Hospital for Special Surgery (HSS) score, and the roentgenographic evaluation form to assess the patients. The survival of prosthesis was assessed using Kaplan-Meiers survival analysis. The patients follow-up periods averaged 12 month. The KSS knee score rose from 44 points (23–68) to 91 points (76–100) following surgery [P < 0.001]. Following the procedure, the mean KSS functional score rose from 20–75 points to 91 points (65–100) [P < 0.001]. The average HSS score rose from 51 points (27–83) to 91 points (75–100) following surgery [P < 0.001]. The average range of motion (ROM) also increased after surgery, going from 68.09° ± 35.99° (0°–120°) to 113.68° ± 8.90° (100°–130°) [P < 0.001]. The average hip-knee-ankle (HKA) angle was 180.24° ± 1.77° (175°–184°) following surgery, compared to 176.88° ± 14.48° (135°–199°) before to surgery. Radiolucencies were seen in thirteen knees, mostly on the tibial side. After an average follow-up of 12 month, 94.7% of prosthesis were still in use. Despite severe deformity, instability, and stiffness at a relatively young age, the mid-term follow-up of primary CCK-TKA in knee osteoarthritis gives satisfactory clinical and functional outcomes with 94.7% prosthesis survival. However, there are a few issues.