Tennis is practiced by a wide range of people throughout
the world and is the most popular of all racket sports. For
the last 10 years tennis practice has grown significantly
for recreational and competition purposes. Frequently
tennis practice begins in childhood and may continue
into late adulthood. In spite of the positive effects that
tennis practice has shown on physical and mental fitness,
some Authors believe that tennis may expose the shoulder
to different kind of injuries [1,2]. In non-elite players,
efforts spent to develop a more effective and aggressive
play using tactics and techniques similar or equal to the
elite players are not always supported by an adequate
physical training and technical development [1-3]. Shoulder
injuries are believed extremely common among elite tennis
players and they are not only related to rotator cuff tendinopathy,
but also to the long head of the biceps and to the
reflection pulley [4-11]; however, the biceps tendinopathy
and shoulder dislocations are relatively rare in the young
tennis players. It is known that a-symptomatic tennis
players may have rotator cuff tendon lesions and reduced
sub-acromial space [6-10] and that asymptomatic shoulder
abnormalities may be found in the majority of the adults
[4]. The rotator cuff interval is the anatomical space where
the coracohumaral ligament keeps the long head of the
biceps in the appropriate position into the glenohumeral
joint. Moreover, when the coracohumeral ligament is
intact, the longhead of the biceps does not undergo
medial subluxation or dislocation out of the bicipital
groove [12]. In case of small anterior supraspinatus tears
or shoulder impingement, which may happen in tennis
players, the coracohumeral ligament may be thickened