Relationship between landing strategy and patellar tendinopathy in volleyball.

Full Abstract

OBJECTIVE:
The aetiology of patellar tendinopathy (jumper's knee) remains unclear. To see whether landing strategy might be a risk factor for the development of this injury, this study examined whether landing dynamics from drop jumps differed among healthy volleyball players (CON) and volleyball players with a jumper's knee. The patients with jumper's knee were divided into an asymptomatic group with a previous jumper's knee (PJK) and a symptomatic group with a recent jumper's knee (RJK).

METHODS:
Inverse dynamics analyses were used to estimate lower extremity joint dynamics from 30, 50 and 70 cm drop jumps in the three groups (CON, n = 8; PJK, n = 7; RJK, n = 9). A univariate repeated measures analysis of variance was used to compare the different landing techniques.

RESULTS:
Data analysis of the landing dynamics revealed that PJK showed higher knee angular velocities (p<0.01), and higher ankle plantar flexion moment loading rate (p<0.01). Furthermore, strong tendencies of higher loading rate of vertical ground reaction force (p = 0.05) and higher knee extensor moment loading rate (p = 0.08) were found compared with CON. Higher values for peak knee moment, peak knee power and knee work (all p<0.01) were found for CON compared with RJK. The comparison of the two jumper's knee groups yielded higher knee angular velocities (p<0.01), together with higher ankle plantar flexion and knee extensor moment loading rate (p<0.01 and p<0.05, respectively).

CONCLUSION:
Where RJK used a landing technique to avoid high patellar tendon loading, PJK used a stiffer landing strategy, which may be a risk factor in the development of patellar tendinopathy.

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Author information

Author/s: Bisseling, Rob W (RW); Hof, At L (AL); Bredeweg, Steef W (SW); Zwerver, Johannes (J); Mulder, Theo (T);

Affiliation: Center for Human Movement Sciences, University Center for Sport, Movement and Health, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands. r.w.bisseling(-atsign-)rug.nl

Journal and publication information

Publication Type: Journal Article

Journal: British journal of sports medicine (Br J Sports Med), published in England. (Language: eng)

Reference: 2007-Jul; vol 41 (issue 7) : pp e8

Dates: Created 2007/06/25; Completed 2007/09/21;

PMID: 17224437, status: MEDLINE (last retrieval date: 12/26/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adult
Athletic Injuries - prevention & control
Case-Control Studies
Humans
Injury Severity Score
Kinetics
Male

Male
Patellar Ligament - injuries
Physical Education and Training - methods
Range of Motion, Articular
Risk Factors
Sports
Tendinopathy - etiology; prevention & control

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