knee-shaped

Crashing down the hill through the brush, the lad had scant time or will for observing things about him, but as they crossed a gully he saw, or fancied he saw, on the knee-shaped crag above, the slouched figure of a buccaneer silhouetted against the sky.

The Black Buccaneer 1934

For Ser Giovanni Conti, one of the secretaries of the Lord Duke Cosimo, he made many useful and beautiful improvements in his house at Florence; although it is true that in the two ground-floor windows, supported by knee-shaped brackets, which open out upon the street, Giuliano departed from his usual method, and so cut them up with projections, little brackets, and off-sets, that they inclined rather to the German manner than to the true and good manner of ancient or modern times.

Lives of the most Eminent Painters Sculptors and Architects Vol. 06 (of 10) Fra Giocondo to Niccolo Soggi Giorgio Vasari 1542