Injuries of Water Polo Players —In Special Regard to the Knee Joint—

Koji Wakayoshi, Yukinori Tomoda, Tokuhide Doi, Makoto Hiraoka, Yoshihisa Urita, Kazushi Tezuka, Toru Fukubayashi, Yutaka Kamimaki, Hitoshi Shimojo

Research output: Contribution to journalArticle


102 water polo players were interviewd about the injuries caused by water polo. 13% of the subjects had knee pain at least once a year. 73% of which were chronic cases. For 24 players, clinical examinations, including X-ray examination, α-P knee laxity measurement, isokinetic strength measurement of knee muscles, and photo analysis of the vertical egg beater kick motion were performed to elucidate the cause of knee pain. The summary of the results were as follows ; 1. The most common site of knee pain was the medial portion of the knee joint. 2. Protrusion of the medial femoral epicondyle and sharpning of the tibial intercondylar eminentia as well as spur formation of the superior pole of the patella were observed in most subjects. 3. Injured subjects had stiff knees and weak knee extensor muscles. 4. The vertical egg beater kick motion must be the main factor of the painful knee.

Original languageEnglish
Pages (from-to)85-94
Number of pages10
JournalJapanese Journal of Physical Fitness and Sports Medicine
Issue number2
Publication statusPublished - 1987
Externally publishedYes



  • joint laxity
  • knee joint
  • water polo injury

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Wakayoshi, K., Tomoda, Y., Doi, T., Hiraoka, M., Urita, Y., Tezuka, K., Fukubayashi, T., Kamimaki, Y., & Shimojo, H. (1987). Injuries of Water Polo Players —In Special Regard to the Knee Joint—. Japanese Journal of Physical Fitness and Sports Medicine, 36(2), 85-94.