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Information about a piece of news titled Chris Skazalski is defending his thesis on Thursday March 23rd

Chris Skazalski is defending his thesis on Thursday March 23rd


Chris Skazalski is defending his thesis "Understanding volleyball injuries - The etiology and burden associated with the sport’s most common injuries".

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Date: Thursday March 23rd 2023

Place: Aud Innsikt

Time - Trial lecture: 10.15 - 11.00 - "Prehabilitation: fit for surgery".

Time - Thesis Defence: 13.00 - 16.00 - "Understanding volleyball injuries - The etiology and burden associated with the sport’s most common injuries".



Committee chair: Professor Olivier Seynnes, Department of Physical Performance, Norwegian School of Sport Sciences

First opponent: Professor Johannes Zwerver, University Medical Center Groningen

Second opponent: MD PhD Kirsten Lundgren, Lovisenberg Diakonale Sykehus


Main: Professor Roald Bahr, Chair of the Oslo Sports Trauma Research Center, Norwegian School of Sport Sciences

Second: Rod Whiteley, PhD, Specialist Sports Physiotherapist, Aspetar



Volleyball is a fast-paced, hard-hitting sport that requires its athletes to perform a large volume of jumps and overhead attacks. As a result, most injuries in volleyball involve the ankle, knee, back, hand/fingers, and shoulder – comprising about 70% of all injuries within the sport. Injury risk management approaches may want to focus on these common injury locations to achieve maximum results.

Ankle sprains are the most common type of acute volleyball injury. To best understand the sport specific factors involved with ankle sprains, it is recommended to perform a detailed video analysis of actual injury situations, since there is limited validity of questionnaire data from players and witnesses to provide this important contextual information. The repetitive nature of jumping within the sport has long been believed to be associated with knee problems (i.e., jumper’s knee).

A commercially available device to measure jump load has garnered significant adoption within the sport, but still needs to be validated in this population of professional players. Additionally, position and individual jump variability among professional players has not been investigated and individualjump demands are unknown. Despite the prevalence of shoulder problems in volleyball, prospective studies examining associated risk factors are almost non-existent. Finally, the knee, low back, and shoulder account for most overuse injuries in volleyball; unfortunately, previous studies utilized methodology that failed to examine the extent of their injury burden and impact on performance. Research using appropriate methods to capture the true prevalence of overuse complaints among elite players is needed; how these complaints change throughout the season is also, unknown.

The overall aim of this thesis was to provide valuable insights into the etiology of volleyball injuries, which lays the foundation for managing injury risk within the highest levels of the sport. We focused on injury burden, risk factors, and mechanisms leading to common injuries and complaints among elite volleyball players.


I. Skazalski C, Kruczynski J, Bahr MA, Bere T, Whiteley R, Bahr R. Landing-related ankle injuries do not occur in plantarflexion as once thought: a systematic video analysis of ankle injuries in world-class volleyball. Br J Sports Med. 2018;52:74-82. doi: 10.1136/bjsports- 2016-097155

II. Skazalski C, Whiteley R, Hansen C, Bahr R. A valid and reliable method to measure jumpspecific training and competition load in elite volleyball players. Scand J Med Sci Sports. 2018;28:1578-1585. doi: 10.1111/sms.13052

III. Skazalski C, Whiteley R, Bahr R. High jump demands in professional volleyball – large variability exists between players and player positions. Scand J Med Sci Sports. 2018;28:2293-2298. doi: 10.1111/sms.13255

IV. Skazalski C, Bahr R, Whiteley R. Shoulder complaints more likely in volleyball players with a thickened bursa or supraspinatus tendon neovessels. Scand J Med Sci Sports. 2021;31:480- 488. doi: 10.1111/sms.13831

V. Skazalski C, Whiteley R, Sattler T, Kozamernik T, Bahr R. Playing with pain: knee, low back, and shoulder problems rampant among university and professional volleyball players (Manuscript in submission 2022).