“…In previous studies, a wide range of values are reported for thickness of the anterior joint capsule. These values can be divided into two main groups: those with a mean of 5 mm, comparable to that in the present study (6,15,23,26,27), and those with a mean of 2-3 mm (2,4,12,13,28). This discrepancy was already observed by Terjesen and Osthus (7), who found it ''difficult to explain, as similar US tech-niques and anatomic landmarks seem to have been employed.''…”