Honestly, the main disadvantage will be time. Cycling can take time. Also, it may present a little tightness in your lower and/or upper back from the constant motion of being hunched over. However, cycling is light impact on the knees as you are never fully extending and locking out. You are not compression stride after stride. Be sure to get a bike that is set for your height. If you do this then the chance for injury will be much less. And lastly, you may fall off your bike. This will be a disadvantage but much will depend on where you ride.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.