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In vivo strain of the medial vs. lateral quadriceps tendon in patellofemoral pain syndrome

Affiliation

  • 1 Rehabilitation Institute of Chicago, Sensory Motor Performance Program, 345 East Superior St., Rm. 1406, Chicago, IL 60611, USA.
  • PMID: 19541742
  • PMCID: PMC2724320
  • DOI: 10.1152/japplphysiol.00024.2009

Free PMC article

In vivo strain of the medial vs. lateral quadriceps tendon in patellofemoral pain syndrome

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Authors

Affiliation

  • 1 Rehabilitation Institute of Chicago, Sensory Motor Performance Program, 345 East Superior St., Rm. 1406, Chicago, IL 60611, USA.
  • PMID: 19541742
  • PMCID: PMC2724320
  • DOI: 10.1152/japplphysiol.00024.2009

Abstract

Patellofemoral pain (PFP) is thought to be related to patellar maltracking due to imbalances in the knee extensor. However, no study has evaluated the in vivo biomechanical properties of the quadriceps tendon in PFP syndrome. Our purpose was to compare the biomechanical properties of the quadriceps tendons in vivo and noninvasively in patients with PFP syndrome to those of control subjects. The null hypothesis was that the quadriceps tendons of PFP subjects would have significantly decreased strain compared with control subjects. Fourteen subjects (7 control, 7 PFP) performed voluntary ramp isometric contractions to a range of torque levels, while quadriceps tendon elongation was measured using ultrasonography. Tendon strain was calculated for the vastus medialis obliquus (VMO) and vastus lateralis (VL) portion of the quadriceps tendon and compared between subjects (control vs. PFP) and within subjects (VMO vs. VL). PFP subjects showed significantly less VMO tendon strain than control subjects (P

Experimental setup. The subject was…

Experimental setup. The subject was seated in a custom chair with the hip…

Measurement of VMO tendon elongation.…

Measurement of VMO tendon elongation. The ultrasound probe was positioned such that the…

Sample torque and elongation curves…

Sample torque and elongation curves over a single 30-s trial. Torque is plotted…

Mean (± SE) strain in…

Mean (± SE) strain in the VMO and VL tendons. Bonferroni post hoc…

Patellofemoral pain (PFP) is thought to be related to patellar maltracking due to imbalances in the knee extensor. However, no study has evaluated the in vivo biomechanical properties of the quadriceps tendon in PFP syndrome. Our purpose was to compare the biomechanical properties of the quadriceps …