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Knee pain, radiographic impingement may indicate lateral patellar facet impingement
Lateral patellar facet impingement is a possible etiology for patients who have lateral or subpatellar knee pain after primary total knee arthroplasty in addition to evidence of radiographic impingement, according to study results.
Among the 3,361 index knee revisions performed at an institution between 1995 and 2008, researchers identified 11 patients for whom surgery was performed due to symptomatic lateral patellar facet impingement (LPFI). These patients were matched with control patients who did not have a diagnosis of LPFI.
To assess surgical intervention outcomes, the researchers calculated Knee Society pain and function scores before and after revisions performed for LPFI. Clinical histories and radiographic imaging were also reviewed before and after TKA revision.
Although study results showed no statistically significant differences in preoperative Knee Society pain and function scores or radiographic features between the groups, the researchers found a significant association between the combined findings of pain in the subpatellar/lateral aspect of the knee post TKA and radiographic lateral facet contact with revision due to LPFI.
Disclosure: See the study for a full list of all authors’ relevant financial disclosures.