Farhad Iranpour1, Azhar M Merican, Wael Dandachli, Andrew A Amis, Justin P Cobb. 1. Division of Surgery, Oncology, Reproductive Biology and Anaesthetics, Department of Musculoskeletal Surgery, Imperial College London, 7th Floor, Charing Cross Hospital, London, UK. f.iranpour@imperial.ac.uk
Abstract
BACKGROUND: In the natural and prosthetic knees the position, shape, and orientation of the trochlea groove are three of the key determinants of function and dysfunction, yet the rules governing these three features remain elusive. QUESTIONS/ PURPOSE: The aim was to define the three-dimensional geometry of the femoral trochlea and its relation to the tibiofemoral joint in terms of angles and distances. METHODS: Forty CT scans of femurs of healthy patients were analyzed using custom-designed imaging software. After aligning the femur using various axes, the locations and orientations of the groove and the trochlear axis were examined in relation to the conventional axes of the femur. RESULTS: The trochlear groove was circular and positioned laterally in relation to the mechanical, anatomic, and transcondylar axes of the femur; it was not aligned with any of these axes. We have defined the trochlear axis as a line joining the centers of two spheres fitted to the trochlear surfaces lateral and medial to the trochlear groove. When viewed after aligning the femur to this new axis, the trochlear groove appeared more linear than when other methods of orientation were used. CONCLUSIONS: Our study shows the importance of reliable femoral orientation when reporting the shape of the trochlear groove.
BACKGROUND: In the natural and prosthetic knees the position, shape, and orientation of the trochlea groove are three of the key determinants of function and dysfunction, yet the rules governing these three features remain elusive. QUESTIONS/ PURPOSE: The aim was to define the three-dimensional geometry of the femoral trochlea and its relation to the tibiofemoral joint in terms of angles and distances. METHODS: Forty CT scans of femurs of healthy patients were analyzed using custom-designed imaging software. After aligning the femur using various axes, the locations and orientations of the groove and the trochlear axis were examined in relation to the conventional axes of the femur. RESULTS: The trochlear groove was circular and positioned laterally in relation to the mechanical, anatomic, and transcondylar axes of the femur; it was not aligned with any of these axes. We have defined the trochlear axis as a line joining the centers of two spheres fitted to the trochlear surfaces lateral and medial to the trochlear groove. When viewed after aligning the femur to this new axis, the trochlear groove appeared more linear than when other methods of orientation were used. CONCLUSIONS: Our study shows the importance of reliable femoral orientation when reporting the shape of the trochlear groove.
Authors: Donald G Eckhoff; Joel M Bach; Victor M Spitzer; Karl D Reinig; Michelle M Bagur; Todd H Baldini; David Rubinstein; Stephen Humphries Journal: J Bone Joint Surg Am Date: 2003 Impact factor: 5.284
Authors: J E Stoddard; D J Deehan; A M J Bull; A W McCaskie; A A Amis Journal: Knee Surg Sports Traumatol Arthrosc Date: 2013-06-01 Impact factor: 4.342
Authors: Mo Saffarini; Jacobus H Müller; Giuseppe La Barbera; Gerjon Hannink; Kyung Jin Cho; Cécile Toanen; David Dejour Journal: Knee Surg Sports Traumatol Arthrosc Date: 2017-03-07 Impact factor: 4.342