Treatment of pigmented villonodular synovitis of the knee with 90 yttrium silicate: prospective evaluation by arthroscopy, histology and 99mTc pertechnetate uptake measurements - Franssen, MJAM; Boerbooms, AMTH; Karhaus, RP; Bujis, WCAM; van de Putte, LBA (Ann Rheum Dis, 1989)