PapadimitriouAbductionSplint

An established method of treatment of developmental dysplasia of the hip (DDH) is the use of abduction splint also in walking children. To achieve a favourable outcome in treatment of DDH, the abduction splint has to place the legs in such abduction thus allowing concentric distribution of pressure of the femoral head inside the dysplastic acetabulum and inducing the remodelling of acetabulum towards normal. The surgeon is usually faced with the dilemma how much abduction is necessary to induce the acetabulum modelling. The degree of abduction of the splint is usually chosen according to surgeons’ experience by surmising which is the optimal biomechanical position of the leg in static X-rays. Most of the times, he has to repeat the X-ray with the child in new abduction position and measure again in a trial and error effort to find the most advantageous position.This procedure in busy everyday clinical settings it time and effort consuming.

How it works? By choosing a few anatomical landmarks of measurement on X-rays captured in the screen the Papadimitriou Abduction splint Application calculates the whole range of measurements in seconds offering great aid to the surgeon. Sixteen radiographic indexes like Hip Value (HV), Acetabular Center Margin angle (ACM), Acetabular Index (AI), the Center-Edge (CE), the Acetabular Depth-Width Ratio (ADR), the femoral head extrusion index or Reimer Index (RI), the Congruity Index (CI), the Sharp’s angle (SA), Tonnis grade of dislocation (TG), the Acetabular Index of the Weight-Bearing Zone (AIW), Congruence Index (CG), the degree of abduction of each femur (ABD), the entry angle (EA), the Neck-shaft angle (NSA), load (R) pressure (P), Surface Weight-Bearing Zone (F0) are measured. The current abduction or adduction of the hip is measured and by scrolling a button you can virtual change the position of the legs. By placing more or less Abduction, the app concurrently calculates load, pressure and its distribution in the new position, which is printed in real time over the X-ray. Each time you change the degree in real time the distribution of pressure is printed for the corresponding degree of abduction. Within this procedure all data are recalculated live in front of your screen, thus allowing to find easily the biomechanically sound position (concentric distribution of pressure inside the acetabulum). Th