Effectiveness of Exercise Relative Motion Orthoses for Limited Finger Joint Motion

Inclusion Criteria: * PIPJ motion deficit with a minimum difference of 10° between passive and active motion * To have an acute injury, i.e. operated on or within maximum 6 weeks of accident * Only one hand is affected * Adult patients over 18 years of age * Understanding German, French or English * Hand therapy treatment in-house at Inselspital in Bern * Ability to give informed consent as documented by signature Exclusion Criteria: * Previous injuries to the hand or PIPJ (e.g., intra-articular fractures, PIPJ ligament damage) that may limit baseline joint mobility and influence responsiveness to the intervention. * Presence of conditions such as osteoarthritis (OA) or rheumatoid arthritis (RA) that may affect PIPJ stiffness, pain, or inflammation. * Inability to follow the procedures of the study, e.g. due to language problems, psychological disorders, dementia * Boutonniere deformity * Minors (below 18 years of age)