Original Research

Reoperation Rates After Cartilage Restoration Procedures in the Knee: Analysis of a Large US Commercial Database

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TAKE-HOME POINTS

  • With a large US commercial insurance database analyzing techniques for cartilage restoration, reparative procedures were favored for chondral injuries compared to restorative approaches.
  • Among patients undergoing microfracture, autologous chondrocyte implantation, osteochondral autograft transfer, and osteochondral allograft transplantation, the average 90-day reoperation rate is 6%.
  • Among patients undergoing microfracture, autologous chondrocyte implantation, osteochondral autograft transfer, and osteochondral allograft transplantation, the average 2-year reoperation rate is 15%.
  • Patients undergoing autologous chondrocyte implantation are more likely to experience reoperation at 90 days, 1 year, and 2 years compared to other cartilage restoration techniques including microfracture, osteochondral autograft transfer, and osteochondral allograft transplantation.
  • Patients undergoing microfracture are more likely to experience an ultimate conversion to arthroplasty compared to other cartilage restoration techniques including autologous chondrocyte implantation, osteochondral autograft transfer, and osteochondral allograft transplantation.


 

References

    ABSTRACT

    The purpose of this study is to describe the rate of return to the operating room (OR) following microfracture (MFX), autologous chondrocyte implantation (ACI), osteochondral autograft transplantation (OATS), and osteochondral allograft (OCA) procedures at 90 days, 1 year, and 2 years. Current Procedural Terminology codes for all patients undergoing MFX, ACI, OATS, and OCA were used to search a prospectively collected, commercially available private payer insurance company database from 2007 to 2011. Within 90 days, 1 year, and 2 years after surgery, the database was searched for the occurrence of these same patients undergoing knee diagnostic arthroscopy with biopsy, lysis of adhesions, synovectomy, arthroscopy for infection or lavage, arthroscopy for removal of loose bodies, chondroplasty, MFX, ACI, OATS, OCA, and/or knee arthroplasty. Descriptive statistical analysis and contingency table analysis were performed. A total of 47,207 cartilage procedures were performed from 2007 to 2011, including 43,576 MFX, 640 ACI, 386 open OATS, 997 arthroscopic OATS, 714 open OCA, and 894 arthroscopic OCA procedures. The weighted average reoperation rates for all procedures were 5.87% at 90 days, 11.94% at 1 year, and 14.90% at 2 years following the index cartilage surgery. At 2 years, patients who underwent MFX, ACI, OATS, OCA had reoperation rates of 14.65%, 29.69%, 8.82%, and 12.22%, respectively. There was a statistically significantly increased risk for ACI return to OR within all intervals (P < .0001); however, MFX had a greater risk factor (P < .0001) for conversion to arthroplasty. There was no difference in failure/revision rates between the restorative treatment options. With a large US commercial insurance database from 2007 to 2011, reparative procedures were favored for chondral injuries, but yielded an increased risk for conversion to arthroplasty. There was no difference in failure/revision rates between the restorative approaches, yet cell-based approaches yielded a significantly increased risk for a return to the OR.

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