{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T21:30:13Z","timestamp":1790890213585,"version":"4.1.0"},"reference-count":34,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2021,9,7]],"date-time":"2021-09-07T00:00:00Z","timestamp":1630972800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2021,9,7]],"date-time":"2021-09-07T00:00:00Z","timestamp":1630972800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.springer.com\/tdm"},{"start":{"date-parts":[[2021,9,7]],"date-time":"2021-09-07T00:00:00Z","timestamp":1630972800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/www.springer.com\/tdm"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Knee surg. sports traumatol. arthrosc."],"published-print":{"date-parts":[[2022,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>Medial patellofemoral ligament reconstruction (MPFL\u2010R) is an important treatment for recurrent patellar instability. Although complications such as redislocation, patellofemoral pain (PFP) and restricted knee range of motion have been reported, few studies have investigated the results of revision surgery for failed MPFL\u2010R. Thus, the aim of this study was to determine the results of the tailored revision surgery after considering the cause of the reconstruction failure.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and methods<\/jats:title><jats:p>Between 2015 and 2019, 28 patients (male\/female 9\/19; age 26.2\u2009\u00b1\u20096.4 years) underwent revision surgery for failed MPFL\u2010R. The patients were grouped into the \u201crecurrent instability\u201d (SG1) group and \u201cPFP\u201d and\/or \u201crestricted range of motion\u201d (SG2) group. Preoperatively, the clinical data, anatomical risk factor profile, and position of the femoral MPFL tunnel were determined for each patient. The Banff Patella Instability Instrument 2.0 (BPII 2.0) and numerical analogue scale (NAS 0\u201310) were administered preoperatively and at the final follow\u2010up for the subjective assessment of the PFP and knee joint function.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Overall, the BPII 2.0 score improved from 28.8\u2009\u00b1\u200916.6 points preoperatively to 68.0\u2009\u00b1\u200922.7 points (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.0001) postoperatively. SG1 exhibited an increase in the BPII 2.0 score from 28.9\u2009\u00b1\u200920.2 points to 75.7\u2009\u00b1\u200923 points (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.0001). PFP decreased from 6.8\u2009\u00b1\u20092.4 to 1.6\u2009\u00b1\u20091.9 (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.0001), while the knee joint function increased from 4.3\u2009\u00b1\u20092.5 to 8.8\u2009\u00b1\u20091.6 (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.0001). In SG2, the BPII 2.0 score increased from 28.7\u2009\u00b1\u200912.6 points preoperatively to 57.7\u2009\u00b1\u200919.7 points (<jats:italic>p<\/jats:italic>\u2009=\u20090.0002) postoperatively and was thus significantly lower than that in SG1 (<jats:italic>p<\/jats:italic>\u2009=\u20090.038). The intensity of PFP decreased from 6.6\u2009\u00b1\u20093.0 preoperatively to 2.1\u2009\u00b1\u20091.9 postoperatively (<jats:italic>p<\/jats:italic>\u2009=\u20090.0006), while the subjective knee joint function improved from 3.2\u2009\u00b1\u20091.4 preoperatively to 7.6\u2009\u00b1\u20092.3 postoperatively (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.0001). The differences between the groups were not significant.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Tailored revision surgery for failed MPFL\u2010R significantly improves the patient\u2010reported disease\u2010specific quality of life. The study results indicate that patients undergoing revision surgery as a consequence of patellar redislocation appear to benefit more from revision surgery than those patients undergoing revision due to postoperative PFP and\/or a limited knee joint range of motion.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of evidence<\/jats:title><jats:p>Level IV.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00167-021-06734-1","type":"journal-article","created":{"date-parts":[[2021,9,7]],"date-time":"2021-09-07T05:02:52Z","timestamp":1630990972000},"page":"1718-1724","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Revision surgery for failed medial patellofemoral ligament reconstruction results in better disease\u2010specific outcome scores when performed for recurrent instability than for patellofemoral pain or limited range of motion"],"prefix":"10.1002","volume":"30","author":[{"given":"Felix","family":"Zimmermann","sequence":"first","affiliation":[{"name":"<!--<label>1<\/label>--> BG Klinik Ludwigshafen Ludwig\u2010Guttmann\u2010Stra\u00dfe 13 67071 Ludwigshafen am Rhein Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Danko D.","family":"Milinkovic","sequence":"additional","affiliation":[{"name":"<!--<label>2<\/label>--> Arcus Sportklinik Pforzheim Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juliane","family":"B\u00f6rtlein","sequence":"additional","affiliation":[{"name":"<!--<label>2<\/label>--> Arcus Sportklinik Pforzheim Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"Balcarek","sequence":"additional","affiliation":[{"name":"<!--<label>2<\/label>--> Arcus Sportklinik Pforzheim Germany"},{"name":"<!--<label>3<\/label>--> Abteilung f\u00fcr Unfallchirugie, Orthop\u00e4die und Plastische Chirurgie Universit\u00e4tsmedizin G\u00f6ttingen G\u00f6ttingen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,9,7]]},"reference":[{"key":"e_1_2_9_2_2","unstructured":"AGA\u2010Research Komitee(2020)Empfehlungen f\u00fcr Kniescores in der Sportorthop\u00e4die.https:\/\/www.aga\u2010online.ch\/komitees\/research\/empfehlungen\u2010fuer\u2010kniescores\u2010in\u2010der\u2010sportorthopaedie\/"},{"key":"e_1_2_9_3_2","doi-asserted-by":"publisher","DOI":"10.1177\/0363546518803936"},{"key":"e_1_2_9_4_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00167\u2010013\u20102650\u20105"},{"key":"e_1_2_9_5_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00167\u2010016\u20104365\u2010x"},{"key":"e_1_2_9_6_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00402\u2010018\u20102971\u20104"},{"key":"e_1_2_9_7_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00167\u2010017\u20104673\u20109"},{"key":"e_1_2_9_8_2","doi-asserted-by":"crossref","unstructured":"BelkinNS MeyersKN RedlerLHet al. 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