Purpose: Problem : Infection in TKA is a devastating yet common complication. 2-stage reimplant procedures are performed in the treatment of this condition. Purpose:To evaluate the clinical, radiographic, complications, and patient satisfaction results of 2nd stage reimplantation revision TKA with the use of a TTO. Technical aspects of TTO length, fixation, bypass, and complications are reported.

Methods: From 1996–2004 our database identified 25 revision TKA (12% of 206 revision TKA) performed using a TTO. In 20/25 cases the procedure was a 2nd stage reimplant. Demographics, infecting organism, Gustillo grade, clinical, radiographic, AORI defects, complications, patient satisfaction were evaluated prospectively. All patients were followed until radiographic union of the TTO.

Results: At a mean follow up of 22 mo(range,6–84) no patients were lost to follow-up. 24 (96%)TTO’s healed - 1 requiring revision ORIF. Prior to reimplantation, patients had undergone a mean of 3.3 prior knee surgeries(range,2–8). Prior extensor mechanism procedures had been performed in 43% of knees. Methicillin resistant staphylococcus was the infecting organism in > 50% of knees. 19 knees had a static cement spacer removed at revision. Time to 2nd stage reimplant was 39 weeks(range,15–68). Poor preop range of motion and stiffness (mean arc 430 , range 10–950) improved significantly postop (mean flexion 880 p< .05). 13 (56%) knees required an adjunctive extensor procedure at the time of TTO. TTO length averaged 8.8cm(range,8–10). Screws(15 knees), 2mm cables(6), wires(4) were used for TTO fixation. Mean stem bypass of the TTO was 63mm (−20 to 100). 21 (84%) patients were satisfied with the procedure, despite 8 knees(32%) requiring further surgery. 6 (24%) TTO complications occurred; 1 escape requiring fixation. All TTO’s had healed at recent follow up.

Conclusions: TTO is a useful procedure for exposure in 2nd stage revision TKA. TTO union is predictable(96%), despite technical complications. Recurrence of infection requiring further surgery did not compromise TTO results. Prior/concurrent extensor mechanism procedures were noted frequently.

Funding : Other Education Grant

Funding Parties : Wright Medical Technologies