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Fig. 2A. —45-year-old man with patellar and trochlear allografts. Axial T1-weighted spin-echo MR image (TR/TE, 600/15) obtained 6 months after surgery shows pins securing trochlear graft (4 pins, straight arrows and arrowheads) and patellar graft (1 pin, curved arrow), which are seen as ill-defined, 1- to 2-mm-thick lines of low signal intensity. One trochlear pin (straight arrows) is seen along its entire length; only portions of other three trochlear pins (arrowheads) can be seen.