unit to form a shrunk ribbon 200 s in which the elements of the non shrunk ribbon retain their reference numbers followed by u201c s u201d fig3 b process parameters knitting speed 26 cm min heat set unit speed 14 ern min shrinkage along warp about 45 shrinkage across warp about 45 reference numbers 206 206 s indicate separation between non interlaced or non bonded sections formation and implantation of a first articular spacer from the shrunk flat knitted poly urethane urea double interlaced ribbon of example 3 implant bodies 300 etc of identical size and shape each comprising an interlacing or bonded section 203 s 203 s u2032 203 s u2033 and a pair of adjoining non interlacing or non bonded sections that is a top section 201 s 202 s u2032 201 s u2033 and a bottom section 202 s 202 s u2032 202 s u2033 are cut out from the shrunk interlaced ribbon 200 s along cutting planes s 1 s 2 s 3 s 4 fig4 a bending away the non interlaced or non bonded sections 201 s 202 s of the implant body 300 in opposite directions results in a t formed articular spacer 300 u2032 fig4 b 4 c of the general geometric kind disclosed in fig1 of u s pat no 7 037 342 b2 intra articular implantation of the spacer 300 u2032.