This study aimed to compare medium-term results for partial capitate shortening (PCS) and radial shortening (RS) osteotomies on lunate bone revascularization and disease progression in patients with stage II or IIIA Kienböck's disease. Patients who underwent surgery for Kienböck's disease between March 2010 and July 2020 were retrospectively evaluated. Clinical evaluation included assessment of pain, joint range of motion, strength, DASH, visual analog scale (VAS) for pain, Modified Mayo Wrist Score (MMWS), satisfaction and time to return to work, with comparison as appropriate to the contralateral side. Preoperative and postoperative plain radiographs and magnetic resonance imaging (MRI) were used for radiological evaluation. Lichtman staging and signal changes in the lunate were evaluated using MRI. Group 1 (PCS) included 14 patients and Group 2 (RS) 14. Mean follow-up was 57.8 months (range 24-102) in Group 1 and 49.4 months (range 36-73) in Group 2. Clinical evaluation included pain on VAS, DASH score, MMWS, range of motion, and grip, palmar and key pinch strength. Regarding lunate bone vascularization, increased signal on final follow-up MRI was observed in 10 of the 14 patients in Group 1 and 7 of the 14 patients in Group 2. There was a positive correlation between revascularization and final follow-up MMWS (p = 0.006). The present study thus showed that functional scores were improved by revascularization in Kienböck's disease. Both osteotomies had clinically and radiologically satisfactory results. However, we believe that PCS osteotomy is preferable, as it leads to higher revascularization rates without increasing ulnolunate load.