Mustafa Citak1, Ali Levent2, Eduardo M Suero3, Kristof Rademacher2, Sophia-Marlene Busch2, Thorsten Gehrke2. 1. Department of Orthopaedic Surgery, ENDO-Klinik Hamburg, Holstenstrasse 2, 22767, Hamburg, Germany. mcitak@gmx.de. 2. Department of Orthopaedic Surgery, ENDO-Klinik Hamburg, Holstenstrasse 2, 22767, Hamburg, Germany. 3. Department of Traumatology, University Hospital München, München, Deutschland.
Abstract
INTRODUCTION: In our previous studies, we were able to identify anatomical differences as a predictor for aseptic loosening following primary and revision surgery with the use of rotating hinge prosthesis. This study was performed to answer following question: can a novel radiological classification system of the distal femur be identified? MATERIALS AND METHODS: A total of 200 patients who received standardized anteroposterior (AP) and lateral views of the knee joint were included in this study. On AP radiographs, we measured the distance between inner diameter of the femur at 20 cm proximally from the knee and at a point 2 cm proximally from the adductor tubercle. The ratio of the inner diameter of the femoral canal at 20 cm proximal of knee joint to the inner diameter of medullary canal at 2 cm proximal of adductor tubercle was used as a novel index ratio. Two observers blindly and independently reviewed the anteroposterior radiographs twice. RESULTS: Three groups of anatomical classification can be constructed for each sex according to the 25th and 75th percentiles. A higher distribution of Type C was found in female patients. The median intra-observer reliability for rater 1 was 0.995 (IQR 0.994-0.997). We had also a high inter-observer reliability with ICC of 0.997 (95% CI 0.996-0.998). CONCLUSIONS: The novel classification presents three different types of the knee joint for male and female patients. Type C has a wider inner diaphyseal diameter compared to Type A with a narrow inner diaphyseal diameter.
INTRODUCTION: In our previous studies, we were able to identify anatomical differences as a predictor for aseptic loosening following primary and revision surgery with the use of rotating hinge prosthesis. This study was performed to answer following question: can a novel radiological classification system of the distal femur be identified? MATERIALS AND METHODS: A total of 200 patients who received standardized anteroposterior (AP) and lateral views of the knee joint were included in this study. On AP radiographs, we measured the distance between inner diameter of the femur at 20 cm proximally from the knee and at a point 2 cm proximally from the adductor tubercle. The ratio of the inner diameter of the femoral canal at 20 cm proximal of knee joint to the inner diameter of medullary canal at 2 cm proximal of adductor tubercle was used as a novel index ratio. Two observers blindly and independently reviewed the anteroposterior radiographs twice. RESULTS: Three groups of anatomical classification can be constructed for each sex according to the 25th and 75th percentiles. A higher distribution of Type C was found in female patients. The median intra-observer reliability for rater 1 was 0.995 (IQR 0.994-0.997). We had also a high inter-observer reliability with ICC of 0.997 (95% CI 0.996-0.998). CONCLUSIONS: The novel classification presents three different types of the knee joint for male and female patients. Type C has a wider inner diaphyseal diameter compared to Type A with a narrow inner diaphyseal diameter.
Authors: Alison Chang; Marc Hochberg; Jing Song; Dorothy Dunlop; Joan S Chmiel; Michael Nevitt; Karen Hayes; Charles Eaton; Joan Bathon; Rebecca Jackson; C Kent Kwoh; Leena Sharma Journal: Arthritis Rheum Date: 2010-05
Authors: Ali Abdulkarim; Anna Keane; Shu Yang Hu; Lachlan Glen; Dermot J Murphy Journal: Orthop Traumatol Surg Res Date: 2019-10-03 Impact factor: 2.256
Authors: Vincenzo De Matteo; Felipe Forero; Sophia-Marlene Busch; Philip Linke; Peter Wilhelm; Kristof Rademacher; Thorsten Gehrke; Mustafa Citak Journal: Jt Dis Relat Surg Date: 2022-03-28