April 21, 2017
1 min read

Revision TKA for flexion instability yielded lower functional improvements

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While patients who underwent revision total knee arthroplasty for flexion instability had functional improvements postoperatively, they had less improvement than patients revised for infection or loosening/osteolysis who had higher baseline function, according to results.

“Patients and surgeons can expect that revision for isolated flexion instability may only obtain modest improvement compared with other diagnoses, potentially in part due to a higher preoperative functional level in patients with instability,” researchers wrote.

Researchers collected demographic data, minimum 1-year Knee Society scores and UCLA activity level scores among 177 patients who underwent revision total knee arthroplasty (TKA) from October 2010 to November 2014. Overall, researchers compared 92 patients with a revision diagnosis of flexion instability, infection, or loosening/osteolysis and excluded revisions with confounding variables and diagnosis groups with small numbers.

At final follow-up, results showed no group differences in Knee Society objective and satisfaction scores or UCLA activity scores. Researchers noted significantly higher preoperative Knee Society function scores in patients with flexion instability. However, the three groups had equivalent improvement in function relative to baseline. Patients were significantly more likely to report that their expectations were not met if they were revised for flexion instability compared with infection or loosening/osteolysis. – by Casey Tingle

Disclosures: Grayson reports no relevant financial disclosures. Please see the full study for a list of all other authors’ relevant financial disclosures.