Back to Life - Early Rehabilitation Therapy for Patients Undergoing Lumbar Spinal Fusion

Aim This study aims to assess the effectiveness of an early intervention comprising individually tailored physiotherapy, including dialogue, education, and graded activity, following lumbar spinal fusion surgery. The effectiveness will be evaluated on patient-specific goals, physical activity, pain intensity, pain interference, fear of movement, and pain self-efficacy for patients after a lumbar spinal fusion.

The investigators will in total include 12 patients undergoing an LSF from the Centre for Rheumatology and Spine Diseases at Rigshospitalet, Denmark. Before inclusion, a pilot of three participants will be performed. Inclusion Criteria for all included: * ≥ 18 years of age * Low back pain (LBP) \> 3 months * Read and understand the Danish language * The participants should be a part of Frederiksberg Municipality and Copenhagen Municipality (in Denmark) Exclusion Criteria: * Post-traumatic vertebral compression/deformity * Patients with the following conditions (infection, neoplasm, metastasis, metabolic bone disease, fractures or other known autoimmune arthropathies) * Patients with patient-related circumstances (physical or mental status) that impede their ability to give informed consent and adhere to the study program (e.g., dementia, developmental disorders, or substance-induced cognitive impairment) * Other special conditions, where the patient is judged by the surgeon as inappropriate to participate