Intraoperative Patella Dimension Measurement in Asian FemalePatients and Its Relevance in Patellar Resurfacing in TKA

Implants used for total knee arthroplasty (TKA) in Asian patients are mostly produced based on anthropometry ofthe Western population, thus causing problem with patella sizing, especially in Asian females where the patellae are regarded to besmaller. )is study is to define intraoperative patella dimensions in our female populations and compare them with currentprosthetic systems available at our institution.Methods. )is is a cross-sectional study involving 156 TKA female patients withnormal patellae. )e patella height, width, thickness, medial and lateral articular facets’ width and thickness, and the domeposition were measured. )e smallest implant size from 3 manufacturers was compared to the data obtained. Analysis usingdescriptive statistics was used to get the mean and median of anatomical patella dimensions, whereas the independentTtest andone-way ANOVA test were used to compare the Malaysian female’s patella dimensions with various implant sizes.Results. )earticular surface of the patella was found to have an oval shape with a width-height ratio of 1.31. )e mean (SD) patella thickness,width, and height were 20.7 (1.85) mm, 40.7 (3.79) mm, and 31.3 (2.81) mm, respectively. Only 17.9% fit for smallest implant sizefrom all 3 manufacturers. )e oval-shape implant was suitable in 53.8% patients based on their width-height ratio. )e domeposition is 2.2 mm medial to centre.Conclusion. )ese female patients have thinner and smaller patella, which are generally unableto accommodate patellar components based on the Caucasian database. )erefore, orthopaedic implant manufacturers shouldconsider optimizing the thicknesses as well as widths of their patellar prostheses