The muscles that bend (flex) the fingers are called flexor muscles. These flexor muscles move the fingers through cord-like extensions called tendons, which connect the muscles to bone. The flexor muscles start at the elbow and forearm regions, turn into tendons just past the middle of the forearm, and attach to the bones of the fingers (see Figure 1). In the finger, the tendons pass through tunnels that keep them close to the bones, which helps them work better.
Youth baseball leagues often have fairly strict limits on how many innings pitchers can pitch, or how many pitches a player can throw. But for girls playing fast-pitch softball, such guidelines are rare. One reason is that softball pitchers throw underhand, a motion thought to stress the arm less than the overhand throws seen in baseball.
The symptoms of rotator cuff tendinitis tend to get worse over time. Initial symptoms may be relieved with rest, but the symptoms can later become constant. Symptoms that go past the elbow usually indicate another problem.