The aetiology of patellar tendinopathy (jumperâ€™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 and volleyball players with a jumperâ€™s knee. The patients with jumperâ€™s knee were divided into an asymptomatic group with a previous jumperâ€™s knee (PJK) and a symptomatic group with a recent jumperâ€™s knee (RJK). Inverse dynamics analyses were used to estimate lower extremity joint dynamics from 30, 50 and 70 cm drop jumps in the three groups. A univariate repeated measures analysis of variance was used to compare the different landing techniques. The authors concluded that 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.
British Journal of Sports Medicine 2007, 41(e8).