scholarly journals In vivo Evaluation of Patellar Tendon Stiffness in Individuals with Patellofemoral Pain Syndrome

2008 ◽  
Vol 5 (2) ◽  
pp. 59-63
Author(s):  
Hsin-Yi Liu ◽  
Michelle Boling ◽  
Darin Padua ◽  
R. Alexander Creighton ◽  
Paul Weinhold
Keyword(s):  
Patellar Tendon ◽  
Pain Syndrome ◽  
Patellofemoral Pain Syndrome ◽  
Knee Extension ◽  
Patellofemoral Pain ◽  
Knee Extensors ◽  
Ultrasonic Technique ◽  
In Vivo Evaluation ◽  
Tendon Stiffness

The objective of this study was to utilise an ultrasonic technique to assess the effect of patellofemoral pain syndrome (PFPS) on the mechanical properties of the patellar tendon. Seven subjects with PFPS and seven matched control subjects volunteered to participate in this study. Subjects were asked to perform isometric maximal voluntary contractions of the knee extensors while their knee extension torque was monitored and the displacement of the patellar tendon was recorded with an ultrasonic system. Our results showed significantly lower tendon stiffness (by ∼30%) in the PFPS subjects. Although tendon secant modulus was lower by 34% in the PFPS subjects, the difference was not statistically significant. Therefore, we conclude that the ultrasonic technique was able to detect a decrease in the structural stiffness of the patellar tendon associated with PFPS. The decrease in tendon stiffness was moderately correlated with the length of symptoms in these individuals.

scholarly journals In vivo evaluation of patellar tendon stiffness in individuals with patellofemoral pain syndrome

2008 ◽  
Vol 5 (2) ◽  
pp. 59-63
Author(s):  
Hsin-Yi Liu ◽  
Michelle Boling ◽  
Darin Padua ◽  
R. Alexander Creighton ◽  
Paul Weinhold
Keyword(s):  
Patellar Tendon ◽  
Pain Syndrome ◽  
Patellofemoral Pain Syndrome ◽  
Patellofemoral Pain ◽  
In Vivo Evaluation ◽  
Tendon Stiffness

scholarly journals Sonographic evaluation of patellar tendon displacement and its correlation with patellofemoral pain syndrome

2021 ◽  
Vol 28 ◽  
pp. 221049172110355
Author(s):  
Consuelo B Gonzalez-Suarez ◽  
Cherie-Lee A Apiag ◽  
Kris A. Agarao ◽  
Fe T. Chavez ◽  
Reil V. Espino ◽  
...  
Keyword(s):  
Patellar Tendon ◽  
Pain Syndrome ◽  
Potential Method ◽  
Patellofemoral Pain Syndrome ◽  
Patellofemoral Pain ◽  
Football Players ◽  
Comprehensive Understanding ◽  
Patellar Maltracking ◽  
Significant Difference ◽  
The Difference

Background Patellofemoral pain syndrome is the most common knee condition and is associated with patellar maltracking. Ultrasound is used in studying patellar maltracking. The objective is to determine if the technique which analyzes the displacement of the patellar tendon in the trochlear sulcus is associated with patellofemoral pain syndrome. Methods In total, 68 knees of 34 football players (males = 20, females = 14) were included. Patellar tendon displacement was assessed in supine and standing positions. Patellar tendon displacement difference in the two positions was determined. Results There was a significant difference in the lateral patellar tendon displacement during standing which was larger in patellofemoral pain syndrome than without patellofemoral pain syndrome (Mean Rank = 39.20 vs. 30.32, p = 0.02). There was no significant difference between the two groups for lateral patellar tendon displacement in supine and the difference in patellar tendon displacement from supine to standing. Conclusion The technique could be a potential method in assessing patellar maltracking. It could be used to have a comprehensive understanding of the pathomechanics and treatment of patellofemoral pain syndrome.

scholarly journals Lumbopelvic Joint Manipulation and Quadriceps Activation of People With Patellofemoral Pain Syndrome

2012 ◽  
Vol 47 (1) ◽  
pp. 24-31 ◽  
Author(s):  
Terry L. Grindstaff ◽  
Jay Hertel ◽  
James R. Beazell ◽  
Eric M. Magrum ◽  
D. Casey Kerrigan ◽  
...  
Keyword(s):  
Repeated Measures ◽  
Pain Syndrome ◽  
Patellofemoral Pain Syndrome ◽  
Knee Extension ◽  
Quadriceps Strength ◽  
Patellofemoral Pain ◽  
Controlled Clinical Trial ◽  
Low Grade ◽  
Force Output ◽  
Quadriceps Force

Context: Quadriceps weakness and inhibition are impairments associated with patellofemoral pain syndrome (PFPS). Lumbopelvic joint manipulation has been shown to improve quadriceps force output and inhibition, but the duration of the effect is unknown. Objective: To determine whether quadriceps strength and activation are increased and maintained for 1 hour after high-grade or low-grade joint mobilization or manipulation applied at the lumbopelvic region in people with PFPS. Design: Randomized controlled clinical trial. Setting: University laboratory. Patients or Other Participants: Forty-eight people with PFPS (age = 24.6±8.9 years, height = 174.3 ± 11.2 cm, mass = 78.4 ± 16.8 kg) participated. Intervention(s): Participants were randomized to 1 of 3 groups: lumbopelvic joint manipulation (grade V), side-lying lumbar midrange flexion and extension passive range of motion (grade II) for 1 minute, or prone extension on the elbows for 3 minutes. Main Outcome Measure(s): Quadriceps force and activation were measured using the burst superimposition technique during a seated isometric knee extension task. A 2-way repeated-measures analysis of variance was performed to compare changes in quadriceps force and activation among groups over time (before intervention and at 0, 20, 40, and 60 minutes after intervention). Results: We found no differences in quadriceps force output (F5,33,101,18 = 0.65, P = .67) or central activation ratio (F4.84,92.03 = 0.38, P= .86) values among groups after intervention. When groups were pooled, we found differences across time for quadriceps force (F2.66,101.18 = 5.03, P = .004) and activation (F2.42,92.03 = 3.85, P = .02). Quadriceps force was not different at 0 minutes after intervention (t40 = 1.68, P = .10), but it decreased at 20 (t40 = 2.16, P = .04), 40 (t40 = 2.87, P = .01) and 60 (t40 = 3.04, P = .004) minutes after intervention. All groups demonstrated decreased quadriceps activation at 0 minutes after intervention (t40 = 4.17, P <.001), but subsequent measures were not different from preintervention levels (t40 range, 1.53–1.83, P >.09). Conclusions: Interventions directed at the lumbopelvic region did not have immediate effects on quadriceps force output or activation. Muscle fatigue might have contributed to decreased force output and activation over 1 hour of testing.

scholarly journals Muscle Activation of Vastus Medialis Oblique and Vastus Lateralis in Sling-Based Exercises in Patients with Patellofemoral Pain Syndrome: A Cross-Over Study

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Wen-Dien Chang ◽  
Wei-Syuan Huang ◽  
Ping-Tung Lai
Keyword(s):  
Muscle Activation ◽  
Vastus Lateralis ◽  
Pain Syndrome ◽  
Patellofemoral Pain Syndrome ◽  
Knee Extension ◽  
Patellofemoral Pain ◽  
Voluntary Contraction ◽  
Vastus Medialis ◽  
Beneficial Effects ◽  
Knee Extension Exercise

Objectives. To examine what changes are caused in the activity of the vastus medialis oblique (VMO) and vastus lateralis (VL) at the time of sling-based exercises in patients with patellofemoral pain syndrome (PFPS) and compare the muscular activations in patients with PFPS among the sling-based exercises.Methods. This was a cross-over study. Sling-based open and closed kinetic knee extension and hip adduction exercises were designed for PFPS, and electromyography was applied to record maximal voluntary contraction during the exercises. The VMO and VL activations and VMO : VL ratios for the three exercises were analyzed and compared.Results. Thirty male (age = 21.19 ± 0.68 y) and 30 female (age = 21.12 ± 0.74 y) patients with PFPS were recruited. VMO activations during the sling-based open and closed kinetic knee extension exercises were significantly higher (P=0.04andP=0.001) than those during hip adduction exercises and VMO : VL ratio for the sling-based closed kinetic knee extension and hip adduction exercises approximated to 1.Conclusions. The sling-based closed kinetic knee extension exercise produced the highest VMO activation. It also had an appropriate VMO : VL ratio similar to sling-based hip adduction exercise and had beneficial effects on PFPS.

Effects of Training on Muscle and Tendon in Knee Extensors and Plantar Flexors in Vivo

2010 ◽  
Vol 26 (3) ◽  
pp. 316-323 ◽  
Author(s):  
Keitaro Kubo ◽  
Toshihiro Ikebukuro ◽  
Hideaki Yata ◽  
Naoya Tsunoda ◽  
Hiroaki Kanehisa
Keyword(s):  
Muscle Strength ◽  
Plantar Flexion ◽  
Knee Extension ◽  
Knee Extensors ◽  
Plantar Flexors ◽  
Tendon Stiffness ◽  
Activation Level ◽  
Extension Group ◽  
Tendon Properties

The purpose of this study was to compare the effects of resistance training on muscle and tendon properties between knee extensors and plantar flexors in vivo. Twenty healthy young men voluntarily participated in this study. The subjects were randomly divided into two training groups: knee extension group (n= 10) and plantar flexion group (n= 10). They performed five sets of exercises with a 1-min rest between sets, which consisted of unilateral knee extension for the knee extension group and plantar flexion for the plantar flexion group at 80% of 1 repetition maximum with 10 repetitions per set (4 days/wk, 12 wk). Before and after training, muscle strength, neural activation level (by interpolated twitch), muscle volume (by magnetic resonance imaging), and tendon stiffness (by ultrasonography) were measured. There were no differences in the training-induced increases in muscle strength, activation level, muscle volume, and tendon stiffness between knee extensors and plantar flexors. These results suggested that if the used protocol of training (i.e., intensity, repetition, etc.) were the same, there were no differences in the training-induced changes in muscle and tendon properties between knee extensors and plantar flexors.

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