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The first patient had connective tissue disease and long-term steroid use. She had acute-on-chronic spontaneous bilateral patellar tendon rupture. She underwent reconstruction with an allograft and defunctioning wire. The second patient had end-stage renal failure with tertiary hyperparathyroidism and was on haemodialysis. He had a right patellar tendon rupture and a left quadriceps tendon rupture. He underwent primary repair of both tendons. Postoperatively, both patients followed a strict physiotherapy regimen and achieved good functional outcome.<\/jats:p>","DOI":"10.1177\/230949901502300233","type":"journal-article","created":{"date-parts":[[2016,10,4]],"date-time":"2016-10-04T17:14:58Z","timestamp":1475601298000},"page":"262-266","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":20,"title":["Spontaneous Disruption of the Bilateral Knee Extensor Mechanism: A Report of Two Cases"],"prefix":"10.1177","volume":"23","author":[{"given":"Chusheng","family":"Seng","sequence":"first","affiliation":[{"name":"Department of Orthopaedic Surgery, Singapore General Hospital, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yi-Jia","family":"Lim","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Changi General Hospital, Singapore"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hee 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