Abstract
AIM: To analyse longitudinal changes in passive range of motion (ROM) in the upper limb in adults with cerebral palsy (CP). METHOD: Passive ROM for shoulder abduction and flexion, supination, and elbow and wrist extension was analysed in a longitudinal cohort of adults aged 16 to 76 years from the Swedish CP registry. Individual ROM trajectories and mean ROM curves were calculated using the Manual Ability Classification System (MACS). A mixed-effects model was used to examine changes over 3 to 13 years 7 months. RESULTS: In total, 1395 adults with CP were analysed (769 males, 626 females; median age 26 years). A continuous decline in shoulder ROM, supination, and wrist extension was observed across all MACS levels. Decline rates differed between MACS levels for shoulder flexion, elbow extension, and wrist extension, with steeper declines at higher MACS levels (levels IV and V). Adults classified in lower MACS levels (I and II) had greater initial ROM and slower declines compared to adults classified in higher MACS levels. INTERPRETATION: Upper-limb ROM continuously declined in adults with CP, particularly at higher MACS levels. The varied decline rates highlight the need for tailored interventions and systematic follow-up to maintain ROM and functional ability, especially among individuals at higher risk.