Revision surgery for failed medial patellofemoral ligament r
Medial patellofemoral ligament reconstruction (MPFL-R) is an important treatment for recurrent patellar instability. The aim of this study was to determine the results of the tailored revision surgery after considering the cause of the reconstruction failure.

28 patients underwent revision surgery for failed MPFL-R. The patients were grouped into the “recurrent instability” (SG1) group and “PFP” and/or “restricted range of motion” (SG2) group. Preoperatively, the clinical data, anatomical risk factor profile, and position of the femoral MPFL tunnel were determined for each patient.

Results:
--Overall, the BPII 2.0 score improved from 28.8±16.6 points preoperatively to 68.0±22.7 points postoperatively.

--SG1 exhibited an increase in the BPII 2.0 score from 28.9±20.2 points to 75.7±23 points.

--PFP decreased from 6.8±2.4 to 1.6±1.9, while the knee joint function increased from 4.3±2.5 to 8.8±1.6.

--In SG2, the BPII 2.0 score increased from preoperatively to postoperatively and was thus significantly lower than that in SG1.

--The intensity of PFP decreased from preoperatively to postoperatively, while the subjective knee joint function improved from 3.2±1.4 preoperatively to 7.6±2.3 postoperatively.

Adapted correction operation for the failed MPFL-R enhances the reported patient-specific quality of life in a considerable way. It appears from the study that post-operative PFP and/or reduced knee joint mobility patients undergoing revise operation as a result of patellar redislocalisation benefit more from revise surgeries than the ones under review.

Source: https://link.springer.com/article/10.1007/s00167-021-06734-1
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