Abstract
The medial and posteromedial regions of the knee are important for knee stability
but also frequently injured. Medial ligaments and capsule are primary and secondary
stabilizers of valgus, rotation, and anterior and posterior translation. In the setting
of rupture of the cruciate ligaments, it is important to identify injuries in this
region because it can possibly alter the treatment strategy and even delay or prevent
successful reconstruction of the cruciate ligaments. Injuries may occur to the superficial
and deep medial collateral ligament, the posterior oblique ligament, the posteromedial
capsule, and the semimembranosus tendon and its attachments. Meniscocapsular separation
is associated with these injuries, and if normal movement of the meniscus and tension
of the capsule and ligaments is altered, instability and eventually osteoarthritis
may occur. Injuries to the posteromedial corner may be underdiagnosed. This article
reviews the anatomy and imaging findings in the medial and posteromedial regions of
the knee.
Keywords
posteromedial corner - posterior oblique ligament - anteromedial rotatory instability
of the knee
