The Kinematics and Kinetics of Slipknots for Arthroscopic Bankart Repair

Am J Sports Med. Nov-Dec 2001;29(6):738-45. doi: 10.1177/03635465010290061201.


An apparatus has been developed to enable the in vitro measurement of the kinematics and kinetics of a slipknot, both while the knot is being tightened and with the knot in place and the tension removed. During tightening, the apparatus provides a linearly increasing resistance, which may be considered analogous to the resistance experienced when the labrum is drawn toward and apposed to the edge of the glenoid cavity during a Bankart repair. The tension to close the knot is measured with a tensiometer, in tandem with the closure of the capsule model onto the bone anchor, which is measured with a datalogger. The tightening tension was limited to 25 N and intraoperator and interoperator comparisons were made for four knots tied by six participants. Failure of a knot was taken to be reverse slippage of 2 mm. A second criterion of ease of slide was used to assess each knot. We found wide interoperator variability with regard to slipknot tying. A methodology for quality control of slipknot tying is presented.

Publication types

  • Evaluation Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Arthroscopy*
  • Biomechanical Phenomena
  • Humans
  • Joint Instability / surgery*
  • Polydioxanone
  • Shoulder Joint / surgery*
  • Sutures*


  • Polydioxanone