Isokinetic muscle performance after ACL reconstruction with hamstrings at three months and two years follow-up

Stefano Zaffagnini, F. Iacono, M. Marcacci, S. Della Villa, C. Nataloni, M. Lo Presti, A. Vascellari

Research output: Contribution to journalArticlepeer-review


Extensor mechanism deficit can be considered as a long term sequel of patellar tendon anterior cruciate ligament (ACL) reconstruction. The use of the hamstring tendon as a graft could reduce these detrimental effects, related to the extensor muscle. The purpose of our study was to evaluate hamstring muscle power after ACL reconstruction at 3 and 24 months following surgery. Twenty-five patients were evaluated clinically with isokinetic testing, using the LIDO isokinetic dynamometer. IKDC and KT 2000 were used for clinical assessment of anterior tibial displacement. An aggressive rehabilitation protocol with resumption of sport after 3 or 4 months of recovery was used in all patients. The results of IKDC and KT 2000 were highly satisfactory at both testing stages. Isokinetic tests showed at 3 months ah 11% deficit for extensor muscles and an 18% deficit for flexor muscles of the post-operative leg. At two years the power of the extensor muscle was greater or the same as that on the non-operative-side, while flexor muscle power remained reduced at least 10%. Extensor power values after 3 months are similar to those observed on a long term follow-up for patellar tendon reconstruction. The flexor muscle deficit noted at 3 months is absent at 2 years and function completely restored at this time. This suggests hamstring ACL reconstruction guarantees a fast functional recovery for the extensor and flexor muscle function and compares well with patellar tendon procedures.

Original languageEnglish
Pages (from-to)164-169
Number of pages6
JournalEuropean Journal of Sports Traumatology and Related Research
Issue number4
Publication statusPublished - Dec 2001


  • ACL
  • Hamstrings
  • Isokinetic
  • Muscle performance

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation


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