Background: Following anterior cruciate ligament (ACL) injury, 20% of patients will develop osteoarthritis. Despite this, there remains a paucity of data describing outcomes of total knee arthroplasty (TKA) after prior ACL reconstruction. We aimed to describe survivorships, complications, radiographic results, and clinical outcomes of TKA after ACL reconstruction in one of the largest series to date.
Methods: We identified 160 patients (165 knees) who underwent primary TKA following prior ACL reconstruction between 1990 and 2016 using our total joint registry. The mean age at TKA was 56 years (range, 29-81), 42% were women, and their mean body mass index was 32. Ninety percent of knees were posterior-stabilized designs. Survivorship was assessed using the Kaplan-Meier method. The mean follow-up was 8 years.
Results: The 10-year survivorships free of any revision and any reoperation were 92 and 88%, respectively. Seven patients were revised for instability (6 global and 1 flexion), 4 for infection, and 2 for other reasons. There were 5 additional reoperations: 3 manipulations under anesthesia, 1 wound debridement, and 1 arthroscopic synovectomy for patellar clunk. Nonoperative complications occurred in 16 patients, 4 of which were flexion instability. Radiographically, all nonrevised knees were well-fixed. Knee Society Function Scores significantly improved from preoperative to 5 years postoperative (P < .0001).
Conclusion: Survivorship of TKA in post-ACL reconstruction knees was lower than expected with instability being the most common reason for revision. In addition, the most common nonrevision complications were flexion instability and stiffness requiring manipulations under anesthesia, indicating that achieving soft tissue balance in these knees may be difficult.
Keywords: anterior cruciate ligament (ACL); arthrofibrosis; flexion instability; global instability; stiffness.
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