Incidence of Patella Alta in Anterior Knee Pain- Assessment with Patellar Height Ratio’s

Volume 1 - Issue 1

Balgovind S Raja¹*, Rajib Naskar¹, Raunak bhole² and Anusree Akshay³

Received: March 10, 2018;   Published: March 16, 2018

DOI: 10.32474/OSMOAJ.2018.01.000105

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Abstract

Background: Altered patellar alignment is associated with anterior knee pain and multitude of conditions that affect the patellofemoral joint. The study aim was to report the incidence of patella altaand patella baja in indian population with anterior knee pain and to investigate whether the normal limits of the patellar height ratios are applicable in indian population.

Methods: Lateral radiographs of 528 knees with anterior knee pain were performed. Patellar heights were measured to calculate the Insall-Salvati (IS), Insall-Salvati Modified (MIS), Blackburne-Peel (BP), Caton Deschamps (CD) ratios.

Results: The overall mean LT/LP ratio was 1.03 (SD 0.37) with incidence of 16.2% (86/528) for patella alta with Insall-Salvati. Mean MIS was found to be 1.68 (SD 0.018) and incidence of patella alta as per MIS ratio was 14.3% (76/528). Blackburne-Peel and Caton-Deschamps ratios revealed mean ratios of 0.88 (SD 0.15) and .99 (SD 0.16) and the incidence of patella alta 17.8% with BP ratio and 10.2% with CD ratio respectively.

Conclusion: Incidence of patella alta was found to be 17.8% with BP ratio, 16.2% with IS ratio, 14.3% with MIS ratio and 10.2% with CD ratio. The BP and IS ratio were the most sensitive with MIS ratio being the more specific one and CD ratio the least sensitive.

Keywords: Insall-salvati ratio; Modified insall-salvati; Blackburne-peel; Caton deschamps; Patellar alignment

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