Final answer:
Considering the lack of improvement after extensive physiotherapy, exploring surgical options may be the next step in treatment for the patient with elbow stiffness after a radial head fracture. Other non-surgical methods, such as advanced physiotherapy or injections, could also be considered before surgery.
Step-by-step explanation:
In the case of a healthy 39-year-old male presenting with posttraumatic elbow stiffness after a minimally displaced radial head fracture, and with normal osseous anatomy shown in follow-up radiographs, the next best step in treatment, considering there has been no improvement in range of motion after 10 weeks of physiotherapy, could potentially include surgical intervention to address the stiffness. Surgical procedures could aim at removing scar tissue or performing an osteotomy if misalignment is causing the stiffness. The objective would be to restore as much function as possible and prevent long-term complications such as early arthritis from a rough joint surface.
Options before considering surgery may include more advanced physiotherapy techniques or even injection therapies to improve mobility. However, the details provided lean towards exploring surgical options due to the lack of improvement with supervised physiotherapy.