– Written by Grethe Myklebust, Norway INTRODUCTION Handball is a high-intensity sport with frequent physical contact between players. The physical… [603642]

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– Written by Grethe Myklebust, Norway
INTRODUCTION
Handball is a high-intensity sport with
frequent physical contact between players.
The physical demands are characterised by intermittent sprinting. Match play involves
high-speed running forwards, backwards
as well as sideways, plant and cutting movements, jumps, landings, turns, and
repeated acceleration and deceleration
movements. Most of the play in handball involves balancing on one or two legs while catching, bouncing (dribbling) or throwing
the ball with one hand. With rough tackles
and frequent body checking, there is an obvious risk of injuries in handball.
The objective of this paper is to review the
literature on handball injuries, presenting the data available on injury risk and the
pattern of injury among handball players. In
addition, information on the consequences
of injury will be presented.
WHAT IS THE RISK OF INJURY IN
HANDBALL?
In the first prospective study on handball
injuries, in 1984 Nielsen & Yde
1 reported injuries among 7 – to 18-year-old players in
one Danish sports club. They documented
an incidence of 10 injuries causing time-
loss from training and/or competition
per 1000 match hours (11 in girls and 9 in
boys). In contrast, in 1997 Wedderkopp et
al2 completed a retrospective study, also in
Danish handball, where they found that
young female players had a much higher
injury incidence with up to 41 injuries per 1000 match hours. In their subsequent prospective intervention study
3, the
incidence was reported as 23 injuries per
1000 match hours. However, since both these studies included all injuries, not just injuries causing time-loss from sports, the
apparent difference in injury incidence was
probably caused by a difference in the injury definition used.
Among senior players we see similar
injury rates as those of young players, with
12 to 14 injuries per 1000 playing hours
1,4,5.
The rate reported depends on the injury definition used (time-loss injuries or all
injuries). There is only one prospective study available from the highest professional level, relying on injury reports from team
medical staff during six major international
tournaments. This showed that the incidence of time-loss injuries was as high
as 40 injuries per 1000 match hours for
men and 36 injuries per 1000 match hours
for women
6. The overall incidence of injury
(including all injuries, not just those causing
time-loss) was on average 108 injuries
per 1000 player hours. Assuming that one
match of 60 minutes corresponds to 7 match
hours of exposure per team, this means that
each team can expect approximately 0.7
injuries each match or one injury causing
time loss from sports participation every
fourth match played.
That the injury risk in handball is sub-
stantial was confirmed through the Inter-national Olympic Committee (IOC) injury
surveillance study from the most recent
Summer Olympic Games. In this study by
Engebretsen et al
7 they reported that 22%
of handball players suffered from an injury
during the 2012 London Games. When
compared to other Olympic team sports, the injury risk appears to be considerably lower THE RISK OF INJURY IN HANDBALL
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sports medicine in handball TARGETED TOPIC
than football (35% of players injured during
the Olympic tournament), but substantially
higher than basketball (11%) and volleyball
(6.9%). Most studies have not reported much
of a gender difference in injury risk among
youth players1,8. The exception is the study
from the London Olympic Games, where a higher overall injury rate was reported for
women than men (26 vs 17%)
7. In contrast,
in a study by Moller et al9 a higher incidence
of acute injuries was found among male
U16 and U18 players compared to females9.
ACL injuries
Several studies have reported on the
incidence of anterior cruciate ligament
(ACL) injuries in handball. In a retrospective study published in 1990, Strand et al
10 found
that the ACL injury incidence was highest
among women playing at the top level with
0.82 ACL injuries per 1000 playing hours compared to male players with 0.31 injuries
per 1000 playing hours
10. The relatively
high incidence of ACL injuries among
female players, particularly at the elite level,
has later been confirmed by prospective studies
11-13. The highest ACL incidence is
described from elite female handball in
Norway with 2.29 ACL injuries per 1000
match hours13. This corresponds roughly to
each team losing one player to an ACL injury every season.WHICH BODY PARTS ARE AT RISK?
Lower extremity
The majority of acute injuries in handball
are located in the lower extremity, regardless of age and gender
1-5,9,14-16.
The most frequent injury location
reported in handball is the ankle (8 to 45%),
while the most serious injuries are knee injuries (7 to 27%), including injuries to the
ACL. An ankle injury is usually not very serious; typically an ankle sprain needs only a few days off from training and matches.
In contrast, an ACL injury will require a
reconstruction of the torn ligament for most players. A rehabilitation time of 6 to
12 months is necessary for these patients to be able to return to their pre-injury activity level
17.
There is an apparent gender difference in
ACL injury incidence in team sports. Female athletes suffer ACL injuries 4 to 6 times more
often than their male counterparts taking
part in the same sports at the same level.
The high incidence in handball, especially among females, represents a significant
challenge. The good news is, however, that
prevention is possible through specific training programmes
13,18,19.
Few studies report on overuse injuries
but in a study by Olsen et al (2006)8, lower
leg pain (‘shin splints’) was reported to
be the most common problem8. This was verified by Moller et al9, where this was the
most common overuse injury type9.
Upper extremities
Acute injuries to the upper extremities
are frequent and different studies present numbers ranging from 7 to 50% of total
injuries
1,2,4,6,8,14,20. Shoulder and hand/finger
injuries are most common. Finger injuries are more often observed among young
players.
Knowledge of overuse injuries in the
upper extremities is sparse, but a study among German male players showed that 40% of the 25 players examined had been
limited by shoulder pain during training
and play during the previous 6 months
21.
The high prevalence of shoulder problems
have later been confirmed in a study among
elite female Norwegian players. Among the 178 players tested, 57% reported present or
previous shoulder pain. Forty-nine (67%) of those players who had reported pain were limited by reduced training performance
and 24 ( 34%) could not play matches
because of pain
22.
Head injuries
Some studies have reported a high
number of head injuries in top level hand-ball. In a study by Asembo and Wekesas
23
they found that 43% of injuries among males were located to the head and neck,
while the proportion among females was substantially lower with 16%. These results
were confirmed in data from Langevoort et al
6 from international level players with
29 and 31%. It is interesting to note that
there seemed to be few concussions among
these injuries, and one might expect that most of these injuries are blows to the face,
nose or possibly teeth. One hypothesis is
that concussions are not recognised and therefore under-reported in handball, which
is a phenomenon well known in other
sports
24,25. There is insufficient knowledge Figure 1: the main injury location
presented in the literature caused by a mixture of acute and overuse injuries.
Photo: Svein andré Svendsen. reproduced
with permission.
Shoulder
5-15%
Ankle 9-45%Knee 18-22%Head 16%

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of head injuries in handball and this is an
area that needs to be focused on in future
studies. We know from studies on football
that head injuries can be serious and more attention towards prohibited behaviour/
foul play is necessary
26. One way to reduce
these injuries is to work with referees to limit brutal and unfair play through stricter
penalties.
Other types of injury
The most common types of acute injuries
in handball are muscle and ligament
sprains (2 to 68%) and contusions (2 to 36%).
Fractures and dislocations are usually less
common, except for the studies of Fagerli
et al
14 and Asembo and Wekasa23, which
showed a high proportion of fractures: 19
to 22% and 31%, respectively. The study
of Fagerli et al14 was based on patients
treated in the emergency room, which could explain the high proportion of fractures,
while the Asembo and Wekesas
23 study was
done among elite level male players. Their
findings have not been replicated in injury
surveillance on the elite international level6,
where fractures represented only 1 to 2 % of
injuries.
Two studies are available reporting on
specific diagnoses of jumper’s knee and elbow problems among handball players. A study on jumper’s knee among national elite players showed that the prevalence
among females was 10%, and 30% among
male players
27. Another study28 aimed to
survey elbow problems among handball
goalkeepers, documenting that 41% of 729
players experienced elbow problems. The
injury mechanism appeared to be repeated
hyperextension traumas and the condition
was termed ’handball goalie's elbow’28.
WHEN DO INJURIES HAPPEN?Match play vs training
There is no doubt that the incidence of
all types of injury is higher when playing a match than during training
1-5,8,9,15,29. The high
incidence of injuries observed in Olympic
tournaments and World Championships
reinforces the high injury risk in matches, especially at the highest level
6. At the
London Olympics, 75% of the injuries
occurred in match situations and 25% in
training7. This picture is approximately the
same for other adults and for adolescents,
and for both genders. In contrast, when we
look at ACL injuries there is an 8× higher
match incidence among males compared
to a 30× higher match incidence among
females11.Match injury distribution
Few studies have reported details
regarding time of the injury, but in the study of Langevoort et al
6 among international
players, the incidence of injuries increased
toward the middle of each half and
decreased towards the end and 45% of the injuries occurred in the middle 10 minutes
of both halves
6. In the study by Asembo
and Wekesas23, 57% of the injuries occurred
in the second half. Since we do not know anything about when the players sustained
an injury in relation to the exact time (minutes played), it is not possible to draw
any conclusions from this information. One
might suspect that players playing a full match are the ones at the highest risk, but
we do not know if this is the case. In a study
among 215 ACL-injured female players,
146 ( 68%) injuries occurred in match play.
Of those, 63% happened in the first half and 37% in the second half of the match
(Myklebust G, unpublished data).
Shoe-floor interaction
Handball is played on different floor types
with varying quality regarding friction and
shock absorption. The floors are usually of two types: parquet (wooden floors) or
artificial floors. Shoe-surface interaction has
been studied as a risk factor for ACL injury in different sports. In handball, it has been
shown that the risk of ACL injury is 2.4×
greater when competing on artificial floors
compared with wooden floors
30. However,
it is important to note that this is probably
not a result of the floor material (wood vs
synthetic composite) per se, but rather that many of the synthetic floors included in this
study were older floor types which tended
to have a high friction. Nevertheless, there seems to be little doubt that the shoe-surface
playing interface is an important factor to
consider when developing intervention strategies to reduce the rate of serious knee
injuries, although more research is needed.
WHAT ABOUT OVERUSE INJURY?
Acute injuries occur suddenly and have
a clearly defined onset or cause, while
overuse injuries occur gradually. The
Figure 2: distribution of acute injuries
among 517 male and female youth and senior elite handball players. Information
based on Moller et al, BJSM 2012. Photo:
Svein andré Svendsen. reproduced with permission.
Low back 4%
Thigh 8%Hand/finger 12%
Shoulder 7%
Ankle 29%Knee 19%
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141
sports medicine in handball TARGETED TOPICmajority of injuries reported in handball
among both adolescent and adult players
are acute injuries to the lower extremity. In
studies reporting on both acute and overuse injuries, the proportion of overuse injuries
ranges between 7 and 37%
1,2,8. In a study by
Olsen et al8 among youth players, 21% of
the injuries reported were overuse injuries. In a recent study by Moller et al
9 among
517 youth and senior male and female elite players, the proportion was somewhat
higher – 37% were overuse injuries (Figures 2 and 3 )
9. However, it should be noted that
the prevalence of overuse injuries is most
certainly underestimated in these studies.
Overuse injuries are often not captured in standard injury surveillance studies, since
most studies use the ‘time-loss’ definition.
Injury severity
Injury severity is usually classified
according to the duration of time-loss from
training and competition. An injury causing
more than 3 or 4 weeks of absence is usually
said to be severe. Studies have shown that 5
to 48% of injuries are severe
1,3,4,6,8,15,31.
In a study by Olsen et al8 among youth
players, 36% of the acute match injuries
and 48% of the overuse injuries were severe injuries (>21 days absence). In the London
Olympics 5% of the handball players had
injuries that gave more than 7 days of
absence from competition and training. Furthermore, 81% of the severe injuries
occurred during competition
7.
Serious knee injuries such as ACL injuries
and meniscus injuries typically result in
long time absence. In addition, ankle and head injuries are the most frequent injured
body parts leading to absence.
WHAT ARE THE LONG-TERM OUTCOMES?
Injuries can affect performance beyond
the time lost from sport. There is an
increased risk of re-injury. Physical fitness
and performance may be reduced, perhaps
even permanently. In addition, there could be time lost from school and work. In the
study by Nielsen and Yde
1, they found that
41% of injured players still had complaints 6 months after the end of the season.
Moller
9 found that having had two or
more previous severe injuries increased the risk of a new injury among the U16 players
9.
Studies from football have shown that a previous injury to the ankle or knee gives
a five-fold increased risk of a re-injury to the same joint
32. A study among handball players showed that the risk of a re-injury of a reconstructed ACL was 13%, all of them after returning to match play in handball
31.
An ACL injury is a serious injury with
potential long-term health consequences. Osteoarthritis (OA) is a definite risk, whether the patient has surgery or not.
Persons with knee OA suffer from swelling
and pain, loss of knee range of motion and often altered function with diminished
muscle strength
33. In follow-up of handball
players with an ACL injury, Myklebust et al31
showed that 6 to 11 years after injury, the
prevalence of radiological OA was 42% in
surgically treated patients and 46% in those
who did not have surgery. The high risk of OA after ACL injury has been shown by von
Porat et al in a study on football players
34.
Another question is whether handball play
increases the risk of OA even when no injury
has been recognised, but from the loading itself. A study by L’Hermette et al
35 found
that the risk of developing premature hip
OA was high for retired handball players and
significantly greater than for the general population. They examined 20 former male
handball players and 39 control subjects
and found that 60% of the handball players were diagnosed with OA in at least one of
the hip joints compared to only 13% of the
control subjects
35.
CONCLUSION
Handball injuries are quite common,
and mostly acute injuries occur in the lower
extremities, such as ankle and knee sprains.
The most common overuse injuries are in the shoulder, knee and lower leg. More
injuries are recorded in match play than
during training sessions. Future research should emphasise overuse injuries, since
this is a problem which has most likely been
underestimated in previous studies, which have focused mainly on time-loss injuries.
Prevention of handball injuries is a key
factor to reduce the injury burden.
References at www.aspetar.com/journal
Figure 3: distribution of overuse injuries among 517 male and female youth and senior
elite handball players. Information based on Moller et al, BJSM 2012. Photo: t erje
anthonsen. reproduced with permission.Grethe Myklebust P .T., Ph.D.
Oslo Sports Trauma Research Center
Norwegian School of Sport Sciences
Oslo, Norway
Contact: grethe.myklebust@nih.no
Low back 5%
Lower leg 24%Shoulder 15%
Ankle 7%Knee 21%