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Patellar tendon straps decrease pre-landing quadriceps activation in males with patellar tendinopathy.

Adam B Rosen1, Jupil Ko2, Kathy J Simpson3

  • 1University of Nebraska at Omaha, School of Health, Physical Education and Recreation, 6001 Dodge St, Omaha, NE, 68182, USA.

Physical Therapy in Sport : Official Journal of the Association of Chartered Physiotherapists in Sports Medicine
|February 5, 2017
PubMed
Summary

Patellar tendon straps reduced vastus lateralis muscle activation before landing in males with and without tendinopathy. This may help decrease tendon stress and manage pain for individuals with patellar tendinopathy.

Keywords:
BracingEMGJumper's knee

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Area of Science:

  • Sports Medicine
  • Biomechanics
  • Orthopedics

Background:

  • Patellar tendinopathy is a common condition causing anterior knee pain.
  • Quadriceps muscle activity plays a role in the loading of the patellar tendon during dynamic activities.
  • Patellar tendon straps are often used to manage pain associated with patellar tendinopathy.

Purpose of the Study:

  • To investigate the effect of patellar tendon straps on quadriceps muscle activity during drop-jump landings.
  • To compare muscle activity between males with and without patellar tendinopathy.

Main Methods:

  • A case-control study involving 20 recreationally active males (10 with patellar tendinopathy, 10 healthy).
  • Electromyography (EMG) was used to measure vastus medialis, rectus femoris, and vastus lateralis muscle activity.
  • Participants performed drop-jumps with and without a patellar tendon strap in a counterbalanced order.

Main Results:

  • During the pre-landing phase, all participants showed significantly lower vastus lateralis EMG activation when wearing a strap compared to no strap.
  • No significant differences were found in other muscles or during the post-landing phase.

Conclusions:

  • Patellar tendon strap use can decrease vastus lateralis activation prior to landing.
  • This reduction in muscle activity may help alleviate tensile stress on the patellar tendon.
  • These findings suggest a potential clinical benefit for managing pain in individuals with patellar tendinopathy.