Musculoskeletal diseases (MSDs) are the first cause of medical unfitness for work. Among MSDs, back disorders are the most frequently encountered in medical unfitness for work. An half of unfitness for MSDs have been reported as being related to occupational exposure. The standard profile of unfit for musculoskeletal diseases concerns a woman, aged over 45, working as an employee or worker. Objective: To describe the various musculoskeletal diseases resulting in work-related permanent unfitness for work. Methods: In 2017, a multicenter cross-sectional employee survey in the South of France was conducted by 323 occupational physicians. Results: Of the 359,966 employees monitored, 2788 had permanent unfitness for work. This number included 1078 for musculoskeletal diseases, which was more frequent in women (odds ratio, 1.42; confidence interval, 1.20 to 1.68) and showed an increase in women older than 55 years (odds ratio, 6.42; confidence interval, 4.4 to 6.60). Back disorder was the most common work-related disorder reported (n = 488 [45.4%]), with soft tissue conditions being (n = 237 [22.0%]). Arthropathy (n = 157 [14.6%]) had occupational origins in 282 (44.3%), 169 (26.6%), and 55 (8.6%) cases, respectively. Conclusions: Musculoskeletal disability prevention should be encouraged to avoid resultant employment attrition. [ABSTRACT FROM AUTHOR]