KNEE INJURIES PREVALENCE IN BRAZILIAN JIU-JITSU: EPIDEMIOLOGICAL STUDY

198 amateur and professional BJJ fighters, of both sexes, aged between 18 and 60 years, participated in the study. The majority (88%) of the fighters had only one knee injury (p < 0.001). In total, 29.8% proportion of knee injuries (p < 0.001) was identified, which were mainly from the medial collateral ligament (38%), caused by a sprain mechanism (86%) and conservative treatment (65%).

Conclusion:

A high prevalence of knee injuries in JJB fighters was found, compared to other sports that also perform rotational movements and have great body contact, such as mixed martial arts (MMA), judo, soccer, basketball and handball. Some JJB strikes, such as the key and the projection, can cause greater knee joint stress, both in the attacking fighter and in the opponent. The knowledge of the epidemiological characteristics of sports injuries is important in the elaboration of prevention and training protocols more specific to the sport and for the understanding of the complex mechanisms involved with this outcome in sport. Level of Evidence IV, Case Series.

Keywords:
Martial Arts; Knee; Injuries to Athletes; Knee Injuries

		n/%	p-value
Injured JJB fighters	Yes	105/53%	0.23
Injured JJB fighters	No	93/47%	0.23
JJB fighters with knee injuries	1 injury	44/88%	Ref.
	2 injuries	5/10%	< 0,001
	≥ 3 injuries	1/2%	< 0,001
Prevalence of knee injuries (1.000 training hours/athlete/year)	Training hours/year	63.128 hours	-
	Total knee injuries in training	49
	Prevalence (1.000 training hours/ athlete/ year)	0.26

		Knee injuries (n/%)	Total injuries (n/%)	p-value
Sex	Male	54/95%	177/93%	0.5
Sex	Female	3/5%	14/7%	0.5
Age group (years)	18-29	18/32%	52/27%	0.37
Age group (years)	≥ 30	39/68%	139/73%	0.37
Tracks	White	5/9%	24/12%	0.16
	Blue	14/24%	54/28%
	Purple	9/16%	41/21%
	Brown	13/23%	32/17%
	Black	16/28%	40/22%
Training floor	Synthetic	35/61%	128/67%	0.16
Training floor	Canvas	22/39%	63/33%	0.16
Injury timing	Training	49/86%	173/90%	0.15
Injury timing	Competition	8/14%	18/10%	0.15
Fighter practices another sport?	Yes	40/70%	133/70%	0.87
Fighter practices another sport?	No	17/30%	58/30%	0.87
JJB practice time (years)	< 2	7/12%	23/12%	0.87
	2-4	11/19%	33/17%
	≥ 4	39/69%	135/71%
Number of training sessions/week (days)	≤ 3	16/28%	63/33%	0.32
Number of training sessions/week (days)	> 3	41/72%	128/67%	0.32
BJJ Teacher	Yes	13/23%	44/23%	0.95
BJJ Teacher	No	44/77%	147/77%	0.95
Time off sport (weeks)	≤ 1	1/2%	38/20%	< 0.001
	≤ 2	9/16%	42/22%
	≥ 4	47/82%	111/58%
Total	-	57/100%	191/100%	-

Injury Site	n	%	p-value
Knee	57	29.8%	Ref.
Shoulder	34	17.8%	0.006
Ankle/Foot	25	13.1%	< 0.001
Wrist/hand	18	9.4%	< 0.001

Injury mechanism		n/%	p-value
Sprain		49/86%	Ref.
Bruise		1/2%	< 0.001
Anterior knee pain	- Patellofemoral syndrome	2/3%	< 0.001
Anterior knee pain	- Patellar tendinopathy	4/7%	< 0.001
Fracture		1/2%	< 0.001
Total		57/100%	-

Lesion	n/%	p-value
MCL	19/38%	Ref.
Meniscal/Condral	17/34%	0.76
LCL	9/19%	0.02
ACL	3/6%	< 0.001
PCL	1/3%	< 0.001
Total	49/100%	-

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[1] Correspondence: Octávio Barbosa Neto. Federal University of Triângulo Mineiro, Research Group on Human Performance and Sport, Graduate Program in Physical Education. Av. Tutunas, 490, Uberaba, MG, Brazil, 38061500. octavio.neto@uftm.edu.br