Case report
Extensor Mechanism Disruption After Contralateral Middle Third Patellar Tendon Harvest for Anterior Cruciate Ligament Revision Reconstruction

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Abstract

The contralateral central third patellar tendon autograft is a reliable graft choice for revision, and recently, for primary reconstruction of the anterior cruciate ligament (ACL). We report 2 complications including a lateral third tibial tuberosity fracture and a distal patellar tendon avulsion with contralateral patellar tendon autograft with disruption of the extensor mechanism of the donor knee. A patient sustained a lateral tibial tuberosity fracture of the donor knee and underwent open reduction and internal fixation. At 1-year follow-up, she had no extensor lag and full range of motion. Another patient sustained a distal patellar tendon avulsion of the donor knee and underwent primary repair. Three years postoperatively, she had a full range of motion and no extensor lag. Although contralateral middle third patellar tendon autograft for primary and revision ACL reconstruction is established in the literature, extensor mechanism complications can occur. Technical considerations are important to avoid weakening the remaining patellar tendon insertion. Postoperative nerve blocks or local anesthetics may alter pain feedback for regulation of weight bearing and contribute to overload of the donor knee.

Section snippets

Case 1

A 5-ft 5-in, 150-lb 40-year-old woman presented with symptoms of left anteromedial and medial knee pain. Previous orthopaedic surgeries included a left ACL reconstruction with ipsilateral middle third patellar tendon graft in 1989 after a skiing injury. She ruptured her reconstructed left ACL in 1998 in another skiing accident. Arthroscopy was performed in 2000 and confirmed a ruptured ACL graft. Debridement of a cyclops lesion was also performed. The patient sustained another knee injury 2

Case 2

A 5-ft, 120-lb 39-year-old woman presented with right knee instability after undergoing a right ACL reconstruction with ipsilateral bone–patellar tendon–bone autograft in 1997. She continued to experience knee instability and significant medial knee pain that precluded cycling. On presentation 2 years postoperatively, physical examination revealed a 1-2+ Lachman test, 2+ pivot-shift, and a 2+ Losee test. There was a 7.5-mm difference measured by the Knee Laxity Tester (OSI, Union City, CA) with

Discussion

Very few complications have been reported for central third patellar tendon harvest from the contralateral knee despite the well-documented donor-site morbidity for the ipsilateral knee harvest for ACL reconstruction. One of the main arguments against using a contralateral patellar tendon autograft harvest for ACL reconstruction is that it violates the otherwise normal knee and traumatizes the primary postoperative weight-bearing pillar.1 However, Shelbourne and Urch3 suggest that contralateral

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Cite this article as: Busfield BT, Safran MR, Cannon WD. Extensor mechanism disruption after contralateral middle third patellar tendon harvest for anterior cruciate ligament revision reconstruction. Arthroscopy 2005;21:1270.e1-1270.e6 [doi:10.1016/j.arthro.2005.07.010].

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