The Bears’ search for defensive-line help is sure to take them to Notre Dame, where defensive tackle Louis Nix III and defensive end Stephon Tuitt are intriguing prospects who transcend scheme. Nix is coming off surgery in November to repair a torn meniscus. He said he has lost 23 pounds and came in at 6-2, 331 pounds at the NFL Scouting Combine in Indianapolis. It did not prevent him from working out at the combine. ‘‘How’s the knee? It’s fantastic. How’s your knee?’’ the engaging Nix said when asked about it Sunday at the combine. Nix’s athleticism could give him the versatility that will attract a lot of interest in the draft. He could play in a 3-4 or 4-3 defense. ‘‘I don’t care [which], to be honest,’’ he said. Nix is projected to go in the middle of the first round. The Seahawks, Steelers and Ravens were among the teams showing interest.