Characteristics of the physical factors involved in knee extension in soccer players after the onset of Osgood-Schlatter disease

Abstract

[Purpose] The purpose of this study was to clarify the characteristics of physical factors involved in knee extension after the onset of Osgood-Schlatter disease (OSD). [Subjects and Methods] A group of 41 senior high school male soccer players (54 knees) with OSD onset was studied. As a control group, 160 subjects (320 knees) without OSD were also studied. Five factors related to knee extension were determined in both groups. Physical factors were compared between the onset knee of OSD and the right and left knees of non­onset individuals. [Results] The thickness of the rectus femoris muscle (RF) was significantly higher and that of the vastus intermedius muscle (VI) thickness was significantly lower in the knees with OSD onset than those without. In addition, the quadriceps muscle (QF) strength was significantly lower and the hamstring muscle(HM)extensibility was significantly higher in the knees with OSD. [Conclusion] The characteristic physical factors involved in knee extension after onset of OSD indicate that the RF is thick,the VI is thin, the QF strength is low, and the HM extensibility is high. It has been suggested.