Basketball

Patrick Ewing of the New York Knicks underwent a successful arthroscopy on his right knee to clean out loose cartilage. Ewing, who turns 32 on August 5, had similar procedures in 1986 and 1989.

Miscellany

A federal investigation into the helicopter crash that killed NASCAR star Davey Allison points toward pilot inexperience on his part as a cause of the accident.

A 65-page report released by the National Transportation Safety Board said Allison had only 2.8 hours of flying instruction in his Hughes 369HS before the chopper went down last July 12 with him at the controls. The investigative report did not identify a specific cause of the accident.

Hockey

The Philadelphia Flyers signed New York Ranger free-agent forward Craig MacTavish to a two-year contract worth about $1.6 million.