Fig. 3.

Distinct shape changes occur in the knee joint shape of normal controls between 7 and 9 days of incubation. Shape profiles of 7 (A–E), 8 (F–J) and 9 (K–0) day old chick embryo knee joints were outlined and overlaid (n=3). Hollow arrows: posterior curl of the condyles; ^⁎ dorsal groove between the two femoral condyles; single edged bars: intercondylar fossa; filled arrows: emergence of anterior tibial crest.