Long Island’s largest private orthopedic practice, Orlin & Cohen Orthopedic Group, has agreed to join Northwell Health.

Orlin & Cohen has 80 health care providers on staff at eight Long Island locations, according to Northwell, which announced the agreement on Wednesday.

Orlin & Cohen has 35 board certified physicians that specialize in sports medicine, knee and hip replacement and treating a range of injuries.

In addition, the practice offers in-house diagnostic imaging, physical and occupational rehabilitation, pain management and neurology services.

Orlin & Cohen’s 500 employees are becoming Northwell employees.

New Hyde Park-based Northwell operates 17 outpatient practices across Long Island, Westchester and New York City as well as 10 hospital-based programs.

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Northwell also signed a strategic affiliation agreement in April with Philadelphia-based Rothman Institute, one of the nation’s largest orthopedic practices.

Northwell, with 62,000 employees, is the largest private employer in the state.