Jumper's knee or lander's knee? A systematic review of the relation between jump biomechanics and patellar tendinopathy

• Published in: International journal of sports medicine Vol. 35; no. 8; p. 714
• Main Authors: Van der Worp, H, de Poel, H J, Diercks, R L, van den Akker-Scheek, I, Zwerver, J
• Format: Journal Article
• Language: English
• Published: Germany 01-07-2014
• Subjects: Athletic Injuries - etiology; Athletic Injuries - physiopathology; Biomechanical Phenomena; Humans; Patellar Ligament - injuries; Patellar Ligament - physiopathology; Plyometric Exercise; Risk Factors; Tendinopathy - etiology; Tendinopathy - physiopathology
• ISSN: 1439-3964
• DOI: 10.1055/s-0033-1358674

Patellar tendinopathy (jumper's knee) is a common injury in sports that comprise jump actions. This article systematically reviews the literature examining the relation between patellar tendinopathy and take-off and landing kinematics in order to uncover risk factors and potential prevention strategies. A systematic search of the Pubmed, Embase and Amed databases was performed to identify studies that reported kinematics of sport specific jumps in relation to patellar tendinopathy. A quantitative analysis was performed on 4 indentified studies. Differences were found only between controls and asymptomatic subjects with patellar tendon abnormalities. Most differences were found during horizontal landing after forward acceleration. A synthesis of the literature suggests that horizontal landing poses the greatest threat for developing patellar tendinopathy. A stiff movement pattern with a small post-touchdown range of motion and short landing time is associated with the onset of patellar tendinopathy. Accordingly, employing a flexible landing pattern seems to be an expedient strategy for reducing the risk for (re-) developing patellar tendinopathy. Together, these findings indicate that improving kinetic chain functioning, performing eccentric exercises and changing landing patterns are potential tools for preventive and/or therapeutic purposes.