Can rotatory knee laxity be predicted in isolated anterior cruciate ligament surgery?

Nicola Lopomo, Cecilia Signorelli, Tommaso Bonanzinga, Giulio Maria Marcheggiani Muccioli, Maria Pia Neri, Andrea Visani, Maurilio Marcacci, Stefano Zaffagnini

Research output: Contribution to journalArticlepeer-review


Purpose: Despite the overall success of the surgical anterior cruciate ligament (ACL) reconstruction, some patients still present with instability symptoms even after the surgery, mainly due to the presence of associated lesions. At present, the pivot shift test has been reported to be the benchmark to assess rotatory knee laxity. The purpose of this study was to quantitatively evaluate rotatory knee laxity at time-zero in order to determine whether detected post-reconstruction laxity was predictable by its value measured before the reconstruction, which was hypothized to be influenced by the presence of associated lesions. Methods: Rotatory knee laxity was retrospectively analysed in 42 patients, including two different ACL reconstructions. The maximal anterior displacement and the absolute value of the posterior acceleration reached during the reduction of the tibial lateral compartment were intra-operatively acquired by using a navigation system and identified as discriminating parameters. For each parameter, statistical linear regression analysis (line slope and intercept)was performed between preand post-reconstruction values. Results: No statistically significant influence of the initial posterior acceleration on the post-reconstruction outcome was found (line slope, p>0.05), although a statistically significant line intercept was indeed identified (p

Original languageEnglish
Pages (from-to)1167-1172
Number of pages6
JournalInternational Orthopaedics
Issue number6
Publication statusPublished - 2014


  • Acceleration
  • Anterior cruciate ligament reconstruction
  • Displacement
  • Laxity prediction
  • Navigation system
  • Pivot shift test
  • Rotatoryknee laxity

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Medicine(all)

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