Abstract: Objective: Scapholunate ligament injuries lead to wrist pain exacerbated by hyperextension and a reduction in strength, posing challenges for military personnel who require high physical fitness for sports and heavy lifting. This study primarily aimed to assess return-to-work rates using the REFA physical workload scale (Reichsausschuss Für Arbeitszeitermittlung) and return-to-sport following isolated arthroscopic posterior capsuloplasty. Secondary objectives included evaluating pain during forced hyperextension, functional assessments, range of motion, and radiological outcomes. Material and method: A prospective monocentric study was conducted involving military patients who underwent isolated arthroscopic posterior capsuloplasty of the wrist between 2019 and 2024, utilizing the technique originally described by Mathoulin. Results: Nineteen wrists were treated: seven at EWAS stage 3B, six at stage 3C, five at stage 4, and one at stage 5. One patient was lost to follow-up. With a mean follow-up duration of 24 months, all patients returned to work at a physical workload equal to or exceeding their pre-injury capacity, while all but one resumed sport at pre-injury levels. QuickDASH and PRWE scores averaged 8.5 and 14.3, respectively, at the final follow-up. Pain during hyperextension significantly decreased from 6.6 to 2.6 on a 10-point scale. Flexion decreased by 10 degrees; however, extension remained unchanged, and no significant radiological changes were observed. Conclusion: Arthroscopic posterior capsuloligamentous repair results in high rates of return to work involving heavy lifting and sports participation, even in advanced scapholunate injuries (EWAS scores 3C or 4). Postoperative functional wrist scores are remarkably satisfactory. Level of evidence: Prospective study. Level III.