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Julie A. Siegmund, Kellie C. Huxel, and C. Buz Swanik

Context:

Determining whether there are compensations in those with jumper’s knee (JK) might further our understanding of the condition.

Objective:

Comparing lower extremity kinematics and jump performance of basketball athletes with JK with those of healthy controls (C).

Design:

Repeated-measures control-match design.

Setting:

University laboratory.

Participants:

24 male basketball players (12 JK, 12 C) matched by height, weight, position, experience, and frequency of play.

Interventions:

Standing countermovement and running layup jumps.

Main Outcome Measures:

Maximum vertical-jump height, footfall landing, and lower extremity sagittal-plane kinematics.

Results:

There were no significant group differences (P > .05) in vertical-jump height (JK = 64.3 ± 8.6 cm, C = 63.0 ± 9.8 cm) or layup height (JK = 71.3 ± 11.6 cm, C = 73.3 ± 11.0 cm). JK subjects landed flat footed (50%) more than controls (8%). JK subjects showed significantly more hip flexion (JK = 105° ± 24.8°, C = 89.8° ± 14.1°; P = .039) with decreased hip acceleration during the countermovement (JK = −3039 ± 1392°/s2, C = −4229 ± 1765°/s2; P = .040). When landing from the countermovement jump, JK subjects had significantly less knee acceleration (JK = −4960 ± 1512°/s2, C = −6736 ± 2009°/s2; P = 023) and in the layup showed significantly less ankle dorsiflexion (JK = 106.5° ± 9.0°, C = 112.5° ± 7.7°; P = .048) and hip acceleration (JK = − 2841 ± 1094°/s2, C = −3912 ± 1575°/s2; P = .033).

Conclusion:

Compensatory strategies observed in JK subjects might help maintain performance, because their jump height was similar to that of healthy controls.

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Sheri A. Hale

Objective:

To review the etiology of patellar tendinopathy as it relates to clinical management of chronic patellar-tendon disease in athletes.

Data Sources:

Information was gathered from a MEDLINE search of literature in English using the key words patellar tendinitis, patellar tendonitis, patellar tendinosis, patellar tendinopathy, and jumper’s knee.

Study Selection:

All relevant peer-reviewed literature in English was reviewed.

Data Synthesis:

The etiology of patellar tendinopathy is multifactorial, incorporating both intrinsic and extrinsic factors. Age, muscle flexibility, training program, and knee-joint dynamics have all been associated with patellar tendinopathy. The roles of gender, body morphology, and patellar mobility in patellar tendinopathy are unclear.

Conclusions:

The pathoetiology of patellar tendinopathy is a complex process that results from both an inflammatory response and degenerative changes. There is a tremendous need for research to improve our understanding of the pathoetiology of patellar tendinopathy and its clinical management.

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Keith Baar

, 84 ( 2 ), 649 – 698 . PubMed ID: 15044685 doi:10.1152/physrev.00031.2003 10.1152/physrev.00031.2003 Lian , O.B. , Engebretsen , L. , & Bahr , R. ( 2005 ). Prevalence of jumper’s knee among elite athletes from different sports: A cross-sectional study . The American Journal of Sports Medicine

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Adam B. Rosen, Jupil Ko, Kathy J. Simpson, and Cathleen N. Brown

Patellar tendinopathy is often managed with a patellar tendon strap, however, their effectiveness is unsubstantiated. The purpose of this study was to determine if straps altered pain or lower extremity kinetics of individuals with patellar tendinopathy during landing. Thirty participants with patellar tendinopathy and 30 controls completed drop jumps with and without patellar tendon straps. Wearing the strap, tendinopathy participants demonstrated significantly decreased pain and reduced knee adductor moment; all participants displayed significantly decreased anterior ground reaction force while wearing a strap. Patellar tendon strapping may reduce pain due to alterations in direction and magnitude of loading.

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Niell Elvin, Alex Elvin, Cornie Scheffer, Steven Arnoczky, Edwin Dillon, and P. J. Erasmus

The etiology of patellar tendinopathy (jumper’s knee) has been attributed to a significant increase in patellar tendon torques associated with jumping. While some investigators have suggested that patellar tendon torques are greater during takeoff, little is known about the relative magnitudes of patellar tendon torques during takeoff and landing. We hypothesized that peak patellar tendon torques are greater in jump takeoff than in landing, and that there is a linear correlation between jump height and peak patellar tendon torque. Seven asymptomatic, recreational male athletes each performed a series of 21 jumps ranging from low to maximal height. A calibrated fiber-optic sensor, implanted transversely within the patellar tendon was used to measure the knee torque during takeoff and landing. There was no significant difference in the peak patellar tendon torque experienced during takeoff and landing within individuals. There was a moderate correlation (r = .64) between maximum takeoff patellar tendon torques and jump height. There was a weak correlation (r = .52) between maximum landing patellar tendon torques and jump height. There was a moderate correlation (r = .67) between maximum 60°/s isokinetic extension torque and maximum jump height. The lack of a strong correlation between jump height and patellar tendon forces during takeoff or landing suggests that these forces may be technique dependent. Therefore, modifying takeoff and/or landing techniques could reduce patellar tendon force and potentially lessen the incidence of patellar tendinopathy.

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Lucas C. Bianco, James M. May, Smokey L. Fermin, Robert Oates, and Scott W. Cheatham

Key Points ▸ Patella tendinopathy, or jumper’s knee, is common in basketball players. ▸ Treatment programs utilizing positional release therapy may be effective for patients diagnosed with patella tendinopathy. ▸ Positional release therapy paired with thigh and hip therapeutic exercise improved

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Josep C. Benítez-Martínez, Pablo Martínez-Ramírez, Fermín Valera-Garrido, Jose Casaña-Granell, and Francesc Medina-Mirapeix

receive any financial payments or other benefits from any commercial entity related to the subject of this article. References 1. Lian OB , Engebretsen L , Bahr R . Prevalence of jumper’s knee among elite athletes from different sports: a cross-sectional study . Am J Sports Med . 2005 ; 33 ( 4

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Hyunjae Jeon, Melanie L. McGrath, Neal Grandgenett, and Adam B. Rosen

– 1175 . PubMed ID: 17469196 doi:10.1002/jor.20415 17469196 10.1002/jor.20415 2. Rudavsky A , Cook J . Physiotherapy management of patellar tendinopathy (jumper’s knee) . J Physioth . 2014 ; 60 ( 3 ): 122 – 129 . doi:10.1016/j.jphys.2014.06.022 10.1016/j.jphys.2014.06.022 3. Lian OB

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Paula Chaves, Daniela Simões, Maria Paço, Sandra Silva, Francisco Pinho, José Alberto Duarte, and Fernando Ribeiro

Patellar tendinopathy, also known as jumper’s knee, is a condition associated with load demands and excessive use of the patellar tendon, which results in a pathologic cascade of events including neovascularization, nerve ingrowth, tendon degeneration, and, ultimately, a painful tendon. 1 – 3

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Hai-Jung Steffi Shih, Danielle N. Jarvis, Pamela Mikkelsen, and Kornelia Kulig

L , Bahr R . Prevalence of jumper’s knee among elite athletes from different sports: a cross-sectional study . Am J Sports Med . 2005 ; 33 ( 4 ): 561 – 567 . PubMed ID: 15722279 doi:10.1177/0363546504270454 10.1177/0363546504270454 15722279 2. Zwerver J , Bredeweg SW , van den Akker