Patellar tendon length after anterior cruciate ligament reconstruction: a comparative magnetic resonance imaging study between patellar and hamstring tendon autografts |
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Authors: | Michael E Hantes Vasilios C Zachos Konstantinos A Bargiotas Georgios K Basdekis Apostolos H Karantanas Konstantinos N Malizos |
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Institution: | (1) Department of Orthopaedic Surgery, Medical School, University of Thessalia, University Hospital of Larissa, Larissa, Greece;(2) Department of Radiology, University Hospital, University of Crete, Heraklion, Greece;(3) 7 Tabara Str, 41447 Larissa, Greece |
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Abstract: | Patellar tendon shortening after anterior cruciate ligament reconstruction may be associated with anterior knee pain or patellofemoral
arthritis. The present study was designed to compare postoperative changes in patellar tendon length after anterior cruciate
ligament reconstruction between patellar tendon and hamstring tendon autograft. Magnetic resonance images of both knees (operated
and healthy) and functional outcome were documented at least 1 year postoperatively in 16 patellar tendon harvested patients
and in 32 hamstrings harvested patients. Patellar tendon length, patella length and Insall–Salvati ratio were measured. The
operated knee values were compared to the respective values of the non-operated control knees. A significant 4.2 mm or 9.7%
patellar tendon shortening in patellar tendon group and a non-significant 1.14 mm or 2.6% shortening in hamstrings group was
detected. No significant difference was detected in terms of major shortening—patella baja—(6% for the patellar tendon group
vs. 0% for the hamsting group). There was no significant difference in anterior knee problems between the two groups as evidenced
by the Shelbourne score (94 for the patellar tendon group vs. 98 for the hamsting group). Harvesting of the patellar tendon
for anterior cruciate ligament reconstruction resulted in a significant shortening of the remaining tendon. In contrast harvesting
of the hamstring tendons did not affect significantly the patellar tendon length. However, the incidence of patella baja and
overall functional outcome was not significantly different between the two groups.
Paper presented at the 12th ESSKA 2000 Congress, Innsbruck, Austria, 2006 and also presented at the 5th Biennial ISAKOS Congress,
Hollywood, FL, USA, 2005. |
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Keywords: | Anterior cruciate ligament Patellar tendon length Patellar tendon graft Hamstring tendon graft |
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