At about 2052 eastern time, a Cessna 182RG was damaged while landing with the gear partially extended at Worcester Regional Airport. The pilot and passenger were not injured. The pilot said they were in cruise flight when he heard the landing gear motor activate and continue to run. He pulled the landing gear breaker and the motor stopped. He reset the breaker and performed the emergency gear extension. The landing gear extended, but did not come forward and lock. While over the runway, the pilot secured the engine and touched down close to stall speed. Only the nose gear was fully extended. Examination found hydraulic fluid in the wheel well for the nose gear and along the bottom side of the fuselage.