[Purpose] This study aimed to categorize the internal and external rotation range of
motion (ROM) of ipsilateral hip joints into specific patterns based on the differences
between them, and clarify the distribution of these patterns. [Subjects and Methods] A
total of 222 healthy Japanese medical students (162 males, 60 females) with a mean age of
21.2 ± 4.0 years were enrolled. The ROM of internal and external rotation at the hip were
randomly measured with the subjects in the prone position. Thereafter, the difference
between internal and external rotations was assessed. Hip ROM patterns were classified
into 3 types based on the differences in the rotation ROM on each side. A total of 9
overall patterns were then determined based on the combination of patterns on both sides.
[Results] Although all the subjects were healthy, an asymmetrical ROM between internal and
external rotation in ipsilateral hip joints could be detected via pattern classification.
Moreover, the distribution of each hip ROM pattern was clarified. [Conclusion] Pattern
classification based on differences in internal and external rotation ROM could serve as a
useful evaluation method for clinical manipulative therapy.