Chicago Bulls guard Quintin Dailey voluntarily entered a drug rehabilition center yesterday for the second time this season after failing to show up for a home game against the Detroit Pistons, a spokesman for the Bulls said.

Dailey missed the team's 117-115 loss Tuesday night at Chicago Stadium and did not show up for practice yesterday. Tim Hallam, a spokesman for the club, said Dailey has been suspended without pay.

In a statement, the Bulls said Dailey had "voluntarily gone forward and entered an NBA drug rehabilitation center, in accordance with the NBA drug agreement with the players' association."

Gary Bettman, general counsel for the NBA, said Dailey was admitted to the Van Nuys (Calif.) Community Hospital. He previously was treated at the Pasadena (Calif.) Community Hospital.

Dailey missed 13 games at the start of the season when he was being treated at the Pasadena facility. He returned to the team in mid-November.

After Dailey missed Tuesday's game, General Manager Jerry Krause said: "I'm fed up with him. He has let me down, his teammates, this franchise, this city. I will do everything the league will allow us to do."

The Bulls noted in their statement: "If, after his release from the current stay in the center, he violates the NBA drug statutes for a third time, he will be barred from the NBA for a minimum of two years."

Dailey, a 1982 first-round draft pick who reportedly earns $325,000 a year, is being docked $3,960 for each game he misses, the club said . . .

Bill Cartwright and Pat Cummings of the New York Knicks both will undergo surgery and miss the remainder of the season.

Cartwright will undergo a bone graft to repair the fifth metatarsal bone in his left foot next Tuesday in Oakland. The foot, which has been broken three times, was damaged again Jan. 25 while playing in only his second game in two seasons.

Cummings has missed the last 12 games with chronic tendinitis in his right ankle. It was determined that his tendon sheath is damaged and needs corrective surgery . . .

Magic Johnson, who returned to the Los Angeles Lakers' lineup Tuesday night after missing six games, said he may withdraw from Sunday's NBA All-Star Game. "If I'm not playing well, I'll pull out," said Johnson, who has had a badly bruised and swollen right knee, which he injured Jan. 14.