Final answer:
The potential for recovery or rehab depends on individual circumstances. In the case of Mark, his recovery prospects are fair but not complete. Although he may not regain full strength in his leg due to the loss of muscle mass.
Step-by-step explanation:
The potential for recovery or rehabilitation of a patient depends on several factors. In the case of the patient mentioned, Mark, who suffered from necrotizing fasciitis, his recovery prospects are described as fair. Although he may not regain full strength in his leg due to the loss of muscle mass, his physical therapist is optimistic about him regaining some use of his leg through long-term physical therapy and skin-grafting surgery.