AO2020 - Behind the Scenes Blog Series
By Will Maher
The final part of my Australian Open blog series focuses on the most common tennis injuries I have seen over the past six years both on tour and in our clinic.
Common Tennis Injuries
1. Lumbar spine
The most common injury presentation for tennis players is the lower back or lumbar spine. This is because of the large and repetitious rotational forces required of the spine in all tennis strokes. More specifically the lumbar spine is not designed for rotation movements, the hips and thoracic spine more readily facilitate rotation. If for any reason these joints become stiff then the rotational forces can be absorbed by the lumbar spine, with pain dysfunction soon to follow. One of my roles is to ensure that the thoracic spine and hips are not limited on a daily basis.
2. Shoulder Injuries
There are a lot of acceleration and deceleration movements for the shoulder most notably during the service motion which can place increase load on the labrum (cartilage), rotator cuff tendons and the bursa (pads) in the shoulder.
The cocking stage (see picture) requires the shoulder to be abducted, externally rotated and can lead to injury. Muscle activity (percentage maximum voluntary contraction) during the cocking stage is moderately high in the supraspinatus (53%), infraspinatus (41%), subscapularis (25%), biceps brachii (39%), and serratus anterior (70%) to provide stabilisation. The moderately high activity during this stage demonstrates the importance of anterior and posterior rotator cuff and scapular stabilisation for proper execution of the cocking stage.
If the shoulder becomes stiff and/or muscles are fatigued, the player may not only injure their shoulder. Compensations along the kinetic chain can injure their abdominal muscles, elbow, wrist and hip joints. Just to complicate things the opposite is also common with the shoulder being overloaded due to impairments in any of the above mentioned kinetic chain structures. For example a lack of movement in the opposite hip (service landing hip) needs to be accommodated by the trunk and shoulder potentially causing them to break down.
Kovacs, M., & Ellenbecker, T. (2011). An 8-stage model for evaluating the tennis serve: implications for performance enhancement and injury prevention. Sports health, 3(6), 504–513. doi:10.1177/1941738111414175
3. Abdominal Strain
In tennis players, the abdominal muscles play a significant role in trunk and core stability providing a mechanical link between the lower and upper limbs, and the service motion is undoubtedly involved in the injury mechanism of a rectus abdominus strain. There is large stretching (eccentric load) forces placed on the rectus abdominus during the cocking phase of serving, specifically on the opposite to the hand the players serves with.
Below is an MRI images of 18 year-old male tennis player suffering acute Rectus Abdominus strain lesion. Extended area of haemorrhage and fibril disruption corresponds to a severe injury.
Br J Sports Med 2007;41:842–848. doi: 10.1136/bjsm.2007.036129
4. Change of Surface
One of the unique challenges tennis athletes confront when considering scheduling and injury management is the change of surface during the year. Imagine a basketball player being asked to play on a normal hardwood floor, change to a clay surface then to a grass surface and back to a hardwood surface to finish the year. That is what tennis athletes must deal with every year. Each surface has certain characteristics that require different joint and muscle demands.
Hardcourt: A fast and unforgiving surface combined with modern athletic development of players requiring them to be able to slide on this surface results in large friction and axial loading forces.
Clay Court: A soft surface that can be made up of crushed stone, brick, shale, or other unbound mineral aggregate. As a result the ball is slowed up considerably when it bounces allowing points to last longer, requiring potentially more shots to win points and games.
Grass Court: Is a slippery surface that causes the ball to skid on quickly, usually not much higher than knee height. It is particularly stark in contrast to the clay court that it directly follows. This transition from the French Open season played on Clay to the English Grass Court season requires substantially different neuromuscular demands of athletes. Assessment and treatment during this part of the year is extremely important.