. Cunningham's Text-book of anatomy. Anatomy. 244 OSTEOLOGY. Patellar surface Popliteal GROOVE Lateral^ tibial surface' Impression of medial meniscus Semilunar facet for medial edge of patella in extreme flexion Medial tibial surface The articular surface on the distal extremity is divisible into three parts— that which corresponds to the distal surface of the shaft and is formed by the coalescence of the two condyles in front; and those which overlie the distal and posterior aspects of each of those processes. The former is separated from the latter by two shallow oblique grooves which traver
. Cunningham's Text-book of anatomy. Anatomy. 244 OSTEOLOGY. Patellar surface Popliteal GROOVE Lateral^ tibial surface' Impression of medial meniscus Semilunar facet for medial edge of patella in extreme flexion Medial tibial surface The articular surface on the distal extremity is divisible into three parts— that which corresponds to the distal surface of the shaft and is formed by the coalescence of the two condyles in front; and those which overlie the distal and posterior aspects of each of those processes. The former is separated from the latter by two shallow oblique grooves which traverse the articular surface from before backwards, on either side, in the direction of the anterior part of the intercondyloid fossa. These furrows are the impressions in which fit the anterior parts of the medial and lateral menisci of the knee-joint, respectively, when the knee-joint is extended. The anterior articular area or facies patellaris (patellar surface) is adapted for articulation with the patella. Convex proximo-distally, it displays a broad and shallow central groove, bounded on either side by two slightly convex surfaces. Of the two sides, the lateral is the wider and more prominent, and rises on the front of the bone to a more proximal level than the medial, thus tending to prevent lateral dislocation of the patella. The condylar or tibial surfaces are convex from side to side, and convex from before backwards. Sweeping round the distal surface and posterior extremities of the condyles, they describe a spiral curve more open in front than behind. The medial condylar articular surface is narrower than the lateral, and when its distal aspect is viewed it is seen to de- scribe a curve around a vertical axis. Along the lateral edge of this, and in front, where it bounds the intercondyloid fossa, is a semilunar articular area, best seen when the bone is coated with cartilage. This articulates with the medial edge of the patella in extreme flexion of the joint. The art
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