The ability
to play on different surfaces was recognised early on and
hence the sole of the boot needed to offer resistance or ground
traction. At first the metal tacks on engineer's boots were
used, but Rule 13 meant greater care needed to be taken. Eventually
leather cleats (or studs) replaced these. By the twenties
Adi Dassler had developed replaceable studs which firmly established
his credentials as soccer boot specialist in Germany. The
length of studs was goverend for in 1951 and with the availability
of new polymers natural materials were replaced by synthetics.
The idea for moulded studs had been tried on hockey boots
and when they were transferred to soccer boots a new revolution
took place. Today plugs and cleats of variable length are
used. Soccer boots should afford confident contact with playing
surfaces as well as adapt optimally to all types of surfaces
and weather conditions. On hard surfaces, including hard natural
turf, cleats of different configuration are recommended. On
softer turf or wet ground surfaces shoes with detachable studs
with varying length provide the best anchoring to the ground.
On snowy surfaces other configurations are necessary and rubber
studs preferred. Icy surfaces again demand a different sole
configuration.
Traditionally,
Bootmen were retained by professional clubs and oversaw the
maintenance of the football boots, usually via the apprentices.
One of the most famous soccer apprentices and bootboy was
Rod Stewart (Bentford FC). Using their previous experiences
as players with a command for the game Bootmen advised the
young players on the type of boot for the weather conditions.
The Boot Room a place where the game strategy was worked out
and the most famous Boot Room was at Liverpool FC under the
direction of Bill Shankly. Today tread patterns have changed
and now incorporate curved cleats set into circular arrangements.
The circular arrangement facilitates better grip in all directions
and faster acceleration from the playing surfaces. Greater
emphasis is given to the base area across the ball of the
supporting foot, which reduces peak pressures on the soles
of the feet over a long game. Cleat designs now allow the
foot carrying the player's weight to pivot when the player
twists or is struck by another player. This helps reduce injury
form direct trauma. Further the anti-torque property offered
by the circular configuration of compressible teeth (cleats)
is thought by the designers to reduce rotational injuries
to the knee and ankle. As the game has improved and the demands
of professionalism become a primary focus the number and types
of injury recorded have increased. These in no short measure
have been associated with boot design (Masson & Hess,
1989). Traditional conical cleats have been cited as the main
cause of such injuries and lock into the turf. It was recognised
as far back as 1948 that heel cleats was responsible for foot
fixation and this contributed to knee damage in soccer players.
The principle functions of cleats was to offer resistance
next to the ground by holding the foot stable as the body's
centre of mass passed over it. One major disadvantage is if
the cleat fixed too firmly to the ground then damage to the
musculo-tendonous, ligamentous, cartilaginous, or osseous
structures of the joints may occur. When the foot was fixed
by impact or rotation of the body, these corkscrew forces
passed upwards to the knee and were thought to damage the
joint and its peripheral attachments. Attempts were made to
design a more useful sequence of cleats for heels and forefoot
but in the absence of moulded soles this meant few players
were aware of them. According to Torq & Quedenfeld, there
were two factors, which determined foot fixation and these
are the number and the size of the cleats. The authors were
able to show in a retrospective study of football injuries,
players wearing cleats were less likely to suffer knee injury.
(The shoes with moulded soles containing fourteen, 3/8 inch
cleats. Minimum cleat tip diameter of 1/2 inch and maximum
cleat length of 3/8th inch.)