When Wilhelm Conrad Roentgen discovered the x-ray in November 1895, he investigated it thoroughly, testing its ability to penetrate various inanimate objects and observing its effects on fluorescent screens and photographic film. He gazed in amazement at the image of the bones of his own hand as he allowed the new rays to penetrate his flesh. He made a photographic x-ray image of a hand (reportedly his wife's) and sent prints of it together with his paper describing the new phenomenon to a carefully selected list of scientific colleagues.
By mid-February 1896, Roentgen's paper had not only been published but also reprinted in other scientific journals including the American journal Science. Scientists everywhere repeated Roentgen's simple experiments and confirmed the truth of his discovery. Within a year, x-rays were in widespread use for medical purposes—chiefly for imaging of the skeleton.
Since Roentgen's time, many new imaging techniques have been developed that allow radiologists to see the muscles and other soft tissues of the musculoskeletal system as well as the bones and to evaluate the amount of metabolic activity in the bones and soft tissues. These techniques make skeletal imaging an exciting area of radiology that can enhance patients’ quality of life. The techniques can also be very expensive, however. This chapter is intended to introduce you to musculoskeletal imaging techniques and to suggest efficient ways to use them that will help you to make correct diagnoses without excessive cost. Naturally, the suggestions made in these pages must be tailored to the needs of individual patients.
Conventional radiographs are the most frequently obtained imaging studies. They are chiefly useful for evaluation of the bones, but useful information about the adjacent soft tissues may also be obtained. Gas in the soft tissues may be a clue to an open wound, ulcer, or infection with a gas-producing organism. Calcifications in the soft tissues can indicate a tumor, myositis ossificans, or systemic disorders such as scleroderma or hyperparathyroidism.
To get the most information possible from conventional radiographs, you should carefully choose the study to be ordered. At most hospitals and clinics, standardized sets of views have been developed that are routinely obtained together for evaluation of specific body areas in certain clinical settings. It is useful to know what will routinely be obtained when a certain set of films is ordered. Radiographs of the ankle, for example, usually include a straight frontal view of the ankle, a frontal view obtained with approximately 15 degrees internal rotation of the ankle (the mortise view), and a lateral view. There will be some variation among institutions, however. At a minimum, two views at right angles to one another should be obtained when a fracture or dislocation is suspected, because such injuries are notorious for being very subtle or even invisible in one projection, even when they are glaringly obvious in another view (Figure 6-1...