{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T15:13:14Z","timestamp":1787670794622,"version":"build-2736575974"},"reference-count":30,"publisher":"SAGE Publications","issue":"9","license":[{"start":{"date-parts":[[2015,6,19]],"date-time":"2015-06-19T00:00:00Z","timestamp":1434672000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Am J Sports Med"],"published-print":{"date-parts":[[2015,9]]},"abstract":"<jats:sec>\n                    <jats:title>Background:<\/jats:title>\n                    <jats:p>The incidence of the patellofemoral joint chondral lesions after anterior cruciate ligament reconstruction (ACLR) is disturbingly high. Few studies have assessed the factors affecting patellofemoral joint chondral lesions postoperatively.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Hypothesis:<\/jats:title>\n                    <jats:p>The recovery of quadriceps strength after ACLR could be associated with patellofemoral joint cartilage damage.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Study Design:<\/jats:title>\n                    <jats:p>Cohort study; Level of evidence, 3.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>A total of 88 patients who underwent arthroscopic anatomic double-bundle ACLR with hamstring autografts received second-look arthroscopy at the time of metal staple removal at an average of 24.1 months (range, 12-51 months) postoperatively. All patients underwent standardized isokinetic strength testing for bilateral quadriceps and hamstrings 1 to 2 days before second-look arthroscopy. The patients were divided into 2 groups: Patients in group 1 had a \u226520% deficit on the peak torque measures for quadriceps compared with that of the contralateral knee, whereas those in group 2 had a &lt;20% deficit on peak torque. Cartilage status at the patellofemoral joint and tibiofemoral joint were evaluated by second-look arthroscopy and the Outerbridge classification. Other assessments included the International Knee Documentation Committee (IKDC) score, Tegner and Lysholm scores, side-to-side difference on KT-2000 arthrometer, and range of motion.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>There were 42 patients included in group 1 and 46 patients in group 2. The mean postoperative quadriceps peak torque of the involved knee compared with the contralateral knee was 70% (range, 57%-80%) in group 1 and 95% (range, 81%-116%) in group 2. For all patients, a significant worsening was seen in the patellar and trochlear cartilage ( P = .030 and &lt;.001, respectively) but not at the medial or lateral tibiofemoral joint after ACLR. A significant worsening in the status of both patellar and trochlear cartilage was seen after ACLR in group 1 ( P = .013 and =.011, respectively) and of trochlear cartilage in group 2 ( P = .006). Significantly fewer severe chondral lesions of the patella were found in group 2 than in group 1 (proportion of patients whose cartilage grade worsened: 26% vs 48%, P &lt; .05; difference in cartilage grade: 0.09 vs 0.62, P &lt; .05). There was no significant difference for trochlear chondral worsening between the 2 groups. No significant differences were detected between the 2 groups in terms of hamstring strength; Lysholm, Tegner, and IKDC scores; KT-2000 arthrometer anterior laxity; or range of motion.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>Greater than 80% recovery of quadriceps strength after ACLR is associated with less severe patellar cartilage damage at short-term follow-up.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/0363546515588316","type":"journal-article","created":{"date-parts":[[2015,6,19]],"date-time":"2015-06-19T23:16:38Z","timestamp":1434755798000},"page":"2286-2292","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":37,"title":["Relationship Between Quadriceps Strength and Patellofemoral Joint Chondral Lesions After Anterior Cruciate Ligament Reconstruction"],"prefix":"10.1177","volume":"43","author":[{"given":"Hai-Jun","family":"Wang","sequence":"first","affiliation":[{"name":"Institute of Sports Medicine of Peking University Third Hospital, Beijing, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ying-Fang","family":"Ao","sequence":"additional","affiliation":[{"name":"Institute of Sports Medicine of Peking University Third Hospital, Beijing, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dong","family":"Jiang","sequence":"additional","affiliation":[{"name":"Institute of Sports Medicine of Peking University Third Hospital, Beijing, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xi","family":"Gong","sequence":"additional","affiliation":[{"name":"Institute of Sports Medicine of Peking University Third Hospital, Beijing, 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