Based on the information provided, it is difficult to differentiate between a rotator cuff pathology and frozen shoulder without knowing your age and detailed clinical examination findings. Since your pain has improved with medications and physiotherapy over the past month, continuing conservative treatment is reasonable. If you continue to have difficulty raising your arm after 6 weeks of supervised treatment, develop significant weakness, or your symptoms stop improving, an MRI may then be indicated to evaluate the rotator cuff and other soft tissue structures.
Next Steps
Continue supervised physiotherapy and home exercises. Follow up with your treating orthopaedic surgeon after another 2–4 weeks. If symptoms persist, worsen, or significant weakness develops, undergo a repeat clinical evaluation and consider an MRI.
Health Tips
Please mention your age, whether there was any history of injury, and whether your shoulder has restriction of passive movements in addition to active movements, as these details are essential to distinguish frozen shoulder from a rotator cuff tear.