Can an employer fir employee unable to work because of arthritis?

In most cases, no. The Americans with Disabilities Act (ADA) protects individuals with disabilities from discrimination in employment. Arthritis is considered a disability under the ADA if it substantially limits a major life activity, such as the ability to walk, lift, or sit. If an employee is unable to work because of their arthritis, the employer must provide reasonable accommodations that allow the employee to still perform their job. For example, the employer may need to provide a flexible work schedule, a modified workstation, or assistive devices. If the employee is unable to perform their job with reasonable accommodations, the employer may be able to terminate their employment. However, the employer must show that they could not accommodate the employee's disability without undue hardship.