title: Motion of the shoulder complex in individuals with isolated acromioclavicular osteoarthritis and associated with rotator cuff dysfunction: part 1 - Three-dimensional shoulder kinematics.
abstract: This study described the three-dimensional shoulder motion during the arm elevation in individuals with isolated acromioclavicular osteoarthritis (ACO) and ACO associated with rotator cuff disease (RCD), as compared to controls. Seventy-four participants (ACO=23, ACO+RCD=25, Controls=26) took part of this study. Disability was assessed with the DASH, three-dimensional kinematics were collected during arm elevation in the sagittal and scapular planes, and pain was assessed with the 11-point numeric pain rating scale. For each kinematic variable and demographic variables, separate linear mixed-model 2-way ANOVAs were performed to compare groups. Both ACO groups had higher DASH and pain scores. At the scapulothoracic joint, the isolated ACO group had greater internal rotation than control, and the ACO+RCD group had greater upward rotation than both other groups. At the sternoclavicular joint, both groups with ACO had less retraction, and the isolated ACO group had less elevation and posterior rotation. At the acromioclavicular joint, the isolated ACO group had greater upward rotation, and both ACO groups had greater posterior tilting. Patients with ACO had altered shoulder kinematics, which may represent compensatory responses to reduce pain and facilitate arm motion during arm elevation and lowering.
authors.affiliation: Department of Physical Therapy, Federal University of Rio Grande do Norte, Natal, RN, Brazil; Department of Physical Therapy, Federal University of São Carlos, São Carlos, SP, Brazil.
authors.forename: Catarina de Oliveira
authors.initials: Cde O
authors.lastname: Sousa
authors.affiliation: Department of Physical Therapy, Federal University of São Carlos, São Carlos, SP, Brazil. Electronic address: prcamargo@ufscar.br.
authors.forename: Paula Rezende
authors.initials: PR
authors.lastname: Camargo
authors.affiliation: Department of Physical Therapy, Federal University of São Carlos, São Carlos, SP, Brazil.
authors.forename: Ivana Leão
authors.initials: IL
authors.lastname: Ribeiro
authors.affiliation: Department of Medicine, Federal University of São Carlos, São Carlos, SP, Brazil.
authors.forename: Rodrigo Bezerra de Menezes
authors.initials: RB
authors.lastname: Reiff
authors.affiliation: Department of Physical Therapy, Virginia Commonwealth University, Richmond, VA, USA.
authors.forename: Lori Ann
authors.initials: LA
authors.lastname: Michener
authors.affiliation: Department of Physical Therapy, Federal University of São Carlos, São Carlos, SP, Brazil.
authors.forename: Tania Fátima
authors.initials: TF
authors.lastname: Salvini
mesh_terms: D000328:Adult; D001132:Arm; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009068:Movement; D018482:Muscle, Skeletal / Q000503:physiopathology; D010003:Osteoarthritis / Q000503:physiopathology*; D010146:Pain / Q000517:prevention & control; D010147:Pain Measurement; D012399:Rotation; D017006:Rotator Cuff / Q000503:physiopathology* / Q000601:surgery; D012540:Scapula / Q000502:physiology; D012782:Shoulder / Q000502:physiology*; D012785:Shoulder Joint / Q000502:physiology
keywords: Biomechanics; Movement; Shoulder pain