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Journal of the Korean Academy of Rehabilitation Medicine 2001;25(6):1023-1030.
The Proximal and Distal Interphalangeal Flexion Dysfunction, Opposition Palm Ratio and Thumb Index Ratio in the Korean Adults.
Jang, Ki Un , Jang, Yeong Uck , Yoo, Hyun Jae , Jeong, Kwang Ik , Kim, Do Hoon , Park, Dong Sik
1Department of Rehabilitation Medicine, Hallym University Colleges of Medicine, Korea.
2Department of Rehabilitation Medicine, Kacheon Medical College, Korea.
한국인의 수지굴근 기능부전 비율, 대립위 수장 비율 및 무지시지 비율
장기언, 장영욱, 유현재, 정광익, 김도훈1, 박동식
한림대학교 의과대학 재활의학교실, 1가천대학교 의과대학 재활의학교실
Abstract

Objective
The purpose of this study was to evaluate the incidence of inability to flex proximal interphalangeal (PIP) and distal interphalangeal (DIP) joint in normal Koreans. The opposition palm ratio and thumb index ratio was also of interest.


Method
Randomly selected eighty nine normal Korean adults of 48 men and 41 women, with ages 20 to 79 years. The finger flexion was measured using the standard flexor digitorum superficialis (FDS) and flexor digitorum profundus (FDP) screening tests. Thumb index ratio and opposition palm ratio was also assessed additionally.


Results
In the sample population, 2 subjects (2.2%) were unable to bilaterally flex their fifth PIP joints independently. Four subjects (4.4%) were unable to flex one or both of their fourth or fifth DIP joints. These results show far less incidence of FDS dysfunction comparing with 52% of FDS dysfunction rate in Americans. The opposition palm ratio in men were 63.6% and in women 69.9%, indicating lower ratio in men. The thumb index ratio was not different statistically between the men and women.


Conclusion
These data suggest that the different incidences of FDS and FDP dysfunction should be considered in interpretation. The opposition palm ratio and thumb index ratio might be useful in the hand rehabilitation.

Key Words: Flexor digitorum superficialis (FDS), Flexor digitorum profundus (FDP), Opposition, Thumb, Hand
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