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The effect of knee extensor open kinetic chain resistance training in the ACL-injured knee

Abstract

Purpose

To investigate the effect of different loads of knee extensor open kinetic chain resistance training on anterior knee laxity and function in the ACL-injured (ACLI) knee.

Methods

Fifty-eight ACLI subjects were randomised to one of three (12-week duration) training groups. The STAND group trained according to a standardised rehabilitation protocol. Subjects in the LOW and HIGH group trained as did the STAND group but with the addition of seated knee extensor open kinetic chain resistance training at loads of 2 sets of 20 repetition maximum (RM) and 20 sets of 2RM, respectively. Anterior knee laxity and measurements of physical and subjective function were performed at baseline, 6 and 12 weeks. Thirty-six subjects were tested at both baseline and 12 weeks (STAND n = 13, LOW n = 11, HIGH n = 12).

Results

The LOW group demonstrated a reduction in 133 N anterior knee laxity between baseline and 12 weeks testing when compared to the HIGH and the STAND groups (p = 0.009). Specifically, the trained-untrained knee laxity decreased an average of approximately 5 mm in the LOW group while remaining the same in the other two groups.

Conclusion

Twelve weeks of knee extensor open kinetic chain resistance training at loads of 2 sets of 20RM led to a reduction in anterior knee laxity in the ACLI knee. This reduction in laxity does not appear to offer any significant short-term functional advantages when compared to a standard rehabilitation protocol. These results indicate that knee laxity can be decreased with resistance training of the thigh muscles.

Level of evidence

Randomised controlled trial, Level II.

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Correspondence to Matthew C. Morrissey.

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Barcellona, M.G., Morrissey, M.C., Milligan, P. et al. The effect of knee extensor open kinetic chain resistance training in the ACL-injured knee. Knee Surg Sports Traumatol Arthrosc 23, 3168–3177 (2015). https://doi.org/10.1007/s00167-014-3110-6

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Keywords

  • Therapeutic exercise
  • Quadriceps
  • Joint stability
  • Hypermobility
  • Resistance training