Background: Capitate shortening is the best decompression procedure in management of Kienböck's disease in ulna neutral or positive patients, although carpal collapse develop inevitably. The purpose of this study was to report our experience in partial capitate shortening osteotomy as an alternative procedure. METHODS: Prospective study of 20 patients with Lichtman stage II and IIIa Kienböck's disease, managed by partial capitate shortening osteotomy. RESULTS: At final follow up (average 24.5 months), VAS for Pain improved significantly postoperatively to 3.3. Flexion and extension improved from 62% (±17) and 52% (±21) preoperatively to 63% (±13%) and 68% (±13) postoperatively respectively. The power grip improved significantly from 49% (±16) to 63% (±12) postoperatively. The average quick DASH Score improved from 60.8(±13.8) to 38.3(±13.9) postoperatively. CONCLUSIONS: Partial capitate shortening is a simple and effective procedure for the treatment of ulnar neutral or ulnar positive Kienböck's disease prior to the onset of radiocarpal arthrosis without violation of scaphocapitate joint thus avoiding carpal collapse that follow complete capitate shortening.