STAGED VERSUS SIMULTANEOUS APPROACH IN COMPLEX BILATERAL TOTAL KNEE REPLACEMENT: EXPERIENCE FROM TERTIARY INSTITUTION IN NIGERIA.

Background: Bilateral end-stage knee osteoarthritis is a common presentation. The decision facing both patient and surgeon is whether to undertake the replacement of both knees in one sitting i.e. simultaneous bilateral total knee replacement (SMTKR) or to undertake this as a staged bilateral total knee replacement (STTKR). The decision is made harder by the presence of severe coronal and sagittal plane deformities and associated bone loss. We present our results of treating such patients with a focus on a trilogy of cost, complication and functional outcome following SMTKR. Methodology: A retrospective review of 31 patients who presented with bilateral knee arthritis. 19 underwent SMTKR and 12 underwent STTKR. Data on the trilogy of complication, cost and functional outcome were collected and analysed. Results: Our cohort of patients was overwhelmingly female in both groups at overall F/M = 30/1. Patients in the SMTKR group were slightly younger at a mean of 65 years compared to 69 years in the STTKR group. Mean Oxford Knee Score (OKS) improved significantly in all groups, mean of 54 in SMTKR and 56 in the STTKR groups. There was one fatality in the STTKR from upper GI bleeding and 1 revision for bone graft failure. The overall cost is less with SMTKR. Summary: SMTKR is a safe and effective undertaking in properly selected patients with bilateral end-stage knee arthritis with severe deformities. Significant experience is however needed to successfully tackle complex deformities and such procedures should be undertaken by experienced arthroplasty surgeons.