2023 ISAKOS Biennial Congress ePoster
     
	Risk Factor Of Fifth Metatarsal Stress Fractures In 81 Soccer Players : Retrospective Cohort Study
	
		
				
					Hiroki  Ukita, MD, Hamamatsu-Shi, Shizuoka JAPAN
				
			
				
					Yusei  Funakoshi, MD, PhD, Hamamatsu, Shizuoka JAPAN
				
			
				
					Yuto  Nakamura, MD, Takasaki City, Gunma JAPAN
				
			
		
		Seirei Hamamatsu General Hospital, Hamamatsu, Shizuoka, JAPAN
		
		FDA Status Cleared
	
    
		Summary
        
            Goalkeepers are less likely to suffer fifth metatarsal stress fracture compared to other positions.
        
     
    
	    
		    ePosters will be available shortly before Congress
		    
	    
     
    
	    Abstract
		
        Purpose
Fifth metatarsal stress fracture is the most common stress fracture among soccer players. Patients with this fracture require surgery and it takes three months from operation to return to play because of high risk of nonunion and refracture.
The purpose of this study is to describe risk factors of fifth metatarsal stress fracture in soccer players.
Methods
This retrospective cohort study was approved by the institutional review board at Seirei Hamamatsu General Hospital (approval no.3739).
We retrospectively reviewed 95 feet of 81 soccer players who underwent operation in our hospital between April 1, 2006 and December 31, 2021 using electronic medical records and questionnaires.   
Result:
The mean age was 19.0±4.2 years (range 14-43 years ). 63 players (78%) were elite and 32 played on artificial turf.
Playing positions were 3 goalkeeper’s feet, 32 defender’s feet, 35 midfielder’s feet, 15 forward’s feet. (10 feet were unknown.)
The stress fracture occurred in the non-dominant feet of 55% of defenders and midfielders and 53% of forwards. Outside defenders and midfielders were more likely to suffer the injury in the non-dominant feet (67% and 50%.respectively)compared to central defenders and midfielders(46% and 44%. respectively.)
Of the 95 injured feet, 14 (15%) occurred in February and 12(13%) in March.
Conclusion
Goalkeepers are less likely to suffer fifth metatarsal stress fracture compared to other positions. Outside defenders and midfielders are more likely to suffer the injury to the non-dominant leg. 
In Japan, soccer players are more likely to be injured in February and March.