Email updates

Keep up to date with the latest news and content from Journal of Orthopaedic Surgery and Research and BioMed Central.

Open Access Technical Note

Open wedge high tibial osteotomy: cause of patellar descent

Jason CH Fan

Author Affiliations

Department of Orthopaedics & Traumatology, Alice Ho Miu Ling Nethersole Hospital, Hong Kong SAR, People's Republic of China

Journal of Orthopaedic Surgery and Research 2012, 7:3  doi:10.1186/1749-799X-7-3

Published: 12 January 2012

Abstract

This was a retrospective review of the nine open wedge high tibial osteotomy (HTO) done in a regional hospital in Hong Kong from 2006 to 2008. The mechanical hip-knee-ankle angle improved from average 169.5°(164°-175°) to average 183.9° (179°-187°). Patellar descent was noted in all patients postoperatively, with Blackburne-Peel (BP) index significantly changing from 0.78 (0.64-0.93) to 0.59 (0.38-0.78) (p < 0.05). This change was strongly correlated with the size of anterior bone graft (r = -0.766; p = 0.016). The patellar tendon length as measured by Insall-Salvati index was not changed (pre-operative: 1.02 (0.88-1.25), final: 1.09 (0.8-1.22) (p = 0.683)), inferring that scarring contracture of patellar tendon was not related to patellar descent.