Concerns about the injury have led to a scheduled consultation Monday with doctors to determine its severity and further treatment options.
Martin has been playing through persistent pain and swelling in the knee in the last few weeks but the condition, which the team has described as chronic patella tendinitis, apparently has worsened in recent days.
Martin, who missed his second consecutive game, underwent an MRI late last week and doctors spent the weekend reviewing the results in advance of their meeting with Martin on Monday.
Nuggets coach George Karl, speaking at a pregame news conference, said he expected Martin's status would become clear after his meeting with the doctors.
Martin has been enjoying one of his most productive seasons and has been instrumental in the success of the Nuggets, the Northwest Division leader. He's averaging 11.8 points and 9.6 rebounds in 55 games this season.
The Nuggets also were without guard Ty Lawson, who was held out of a fourth consecutive game because of a bruised left shoulder.