Reuben Rao
Sarawak General Hospital, MalaysiaPresentation Title:
An MRI Derived Formula for Estimating Native Joint Line Position in the Presence of Distal Femoral Bone Loss
Abstract
In the presence of distal femoral condyle bone loss, estimation and restoration of joint line position can be guided by extraarticular bony landmarks with the aid of mathematical formulas that rely on the innate correlations between periarticular measurements. To prevent joint line elevation, the formula should incorporate thickness of distal femoral articular cartilage. The aim of this study was to derive a formula to estimate native joint line position.
One hundred and fifty knee magnetic resonance imaging studies belonging to 150 patients were chosen from a database of scans. Multiple periarticular measurements were taken. Based on the strongest correlation between measurements, linear regression analysis was used to derive a regression equation to estimate joint line position. This formula was then tested to determine its accuracy and reliability in estimating the joint
line.
Using Pearson correlation test, the strongest correlation was identified to be between adductor tubercle to joint line distance, and transepicondylar width. Using linear regression analysis, the following regression equation was obtained:
ATJL = 0.53(TEW) + 2.4mm. This formula estimated joint line within 4mm of native joint line in 86% of measured knees and within 8mm in 100% of measured knees.
The obtained formula reliably estimates native joint line distance from the
adductor tubercle, to within a clinically significant range, using femoral transepicondylar width.
Biography
Reuben Rao obtained his Masters in Orthopaedic Surgery at University Malaya, Malaysia in 2018. Since then he has completed a visiting fellowship in complex lower limb arthroplasty at Leeds Teaching Hospitals, United Kingdom and a clinical and research fellowship in hip and knee surgery and adult joint arthroplasty, at Chonnam National University, South Korea. He is currently enrolled as a fellow in the Malaysian Arthroplasty Subspeciality Training Programme.
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