Novel mechanical impact simulator designed to generate clinically relevant anterior cruciate ligament ruptures

Nathaniel A. Bates, Nathan Schilaty, Christopher V. Nagelli, Aaron Krych, Timothy Hewett

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Background Over 250,000 anterior cruciate ligament ruptures occur each year; therefore, it is important to understand the underlying mechanisms of these injuries. The objective of the current investigation was to develop and analyze an impact test device that consistently produces anterior cruciate ligament failure in a clinically relevant manner. Method A mechanical impact simulator was developed to simulate the ground reaction force impulse generated from landing in a physiologic and clinically relevant manner. External knee abduction moment, anterior shear, and internal tibial rotation loads were applied to the specimen via pneumatic actuators. The magnitudes of applied loads were determined in vivo from a cohort of healthy athletes. Loads were systematically increased until specimen failure was induced. Three cadaveric lower extremity specimens were tested and clinically assessed for failure. Knee specimens were physically and arthroscopically examined at baseline and at post-injury by a board certified orthopedic surgeon. Findings All three specimens experienced failure at either the midsubstance or the femoral insertion site. The mean peak strain prior to failure was 18.8 (6.2)%, while the mean peak medial collateral ligament strain was 7.9 (5.9)%. Interpretation A board certified orthopedic surgeon confirmed observed rupture patterns were representative of clinical cases. Peak strains were consistent with literature. The novel mechanical impact simulator will allow researchers to assess clinically relevant patterns of rupture and the data generated will inform clinician decisions. This novel machine presents the ability to assess healthy specimens as well as differences in the function of deficient and reconstructed knees.

Original languageEnglish (US)
Pages (from-to)36-44
Number of pages9
JournalClinical Biomechanics
Volume44
DOIs
StatePublished - May 1 2017

Fingerprint

Anterior Cruciate Ligament
Rupture
Knee
Collateral Ligaments
Wounds and Injuries
Thigh
Athletes
Lower Extremity
Research Personnel
Equipment and Supplies
Orthopedic Surgeons

Keywords

  • Anterior cruciate ligament
  • Impact
  • Injury simulation
  • Jump landing
  • Knee ligament biomechanics

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine

Cite this

Novel mechanical impact simulator designed to generate clinically relevant anterior cruciate ligament ruptures. / Bates, Nathaniel A.; Schilaty, Nathan; Nagelli, Christopher V.; Krych, Aaron; Hewett, Timothy.

In: Clinical Biomechanics, Vol. 44, 01.05.2017, p. 36-44.

Research output: Contribution to journalArticle

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