Repair of Extensor Mechanism Injuries

  • Clarence L. ShieldsJr.
Part of the Comprehensive Manuals of Surgical Specialties book series (CMSS)


In most sports the extensor mechanism of the knee is repeatedly stressed. Some athletes will develop an inflammatory response from the accumulation of microtrauma, which can be concentrated at either the superior or inferior pole of the patella. This symptom complex has been well classified by Blazina and co-workers into several phases of jumper’s knee.1 Several studies have demonstrated the histological findings of tendon degeneration from the repeated microtrauma.1–3 This process can remain localized to the attachments at either pole of the patella, as described by Phases 1 through 3 in Blazina’s classification, or it can proceed to tendon failure in one catastrophic event.


Patellar Tendon Transverse Incision Extensor Mechanism Inferior Pole Patellar Tendon Rupture 
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  1. 1.
    Blazina ME, Kerlan RK, Jobe FW, et al: Jumper’s knee. Orthop Clin North Am 1973;4: 665–678.PubMedGoogle Scholar
  2. 2.
    Bassett F, Soucacos P, Carr W: Jumper’s knee: Patellar tendinitis and patellar tendon rupture, in American Academy of Orthopedic Surgeons Symposium on the Athlete’s Knee. St. Louis, Mosby, 1980.Google Scholar
  3. 3.
    Roels J, Martens M, Mulier JC, et al: Patellar tendinitis (Jumper’s knee). Am J Sports Med 1978;6: 362–368.PubMedCrossRefGoogle Scholar
  4. 4.
    Siwek CW, Rao JP: Ruptures of the extensor mechanism of the knee joint. J Bone Jt Surg 1981;63-A: 932–937.Google Scholar
  5. 5.
    Kelly DW, Carter VS, Jobe FW, et al: Patellar and quadriceps tendon ruptures— jumper’s knee. Am J Sports Med 1984;12: 375–380.PubMedCrossRefGoogle Scholar
  6. 6.
    Martens M, Wouters P, Bursseens A, et al: Patellar tendinitis: Pathology and results of treatment. Acta Orthop Scand 1982;53: 445–450.PubMedCrossRefGoogle Scholar

Additional Reading

  1. Feretti A, Ippolito E., et al: Jumper’s knee.Am J Sports Med 1983;11:58–62.CrossRefGoogle Scholar
  2. Neckman JD, Alkire CC: Distal patellar pole fractures. A proposed common mechanism of injury. Am J Sports Med 1984; 12:424–428.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag New York Inc. 1987

Authors and Affiliations

  • Clarence L. ShieldsJr.

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