Timothy G Baumer1, Jack Dischler2, Veronica Mende2, Roger Zauel2, Marnix van Holsbeeck3, Daniel S Siegal3, George Divine4, Vasilios Moutzouros5, Michael J Bey2. 1. Bone and Joint Center, Henry Ford Health System, Detroit, MI, USA. Electronic address: tbaumer1@hfhs.org. 2. Bone and Joint Center, Henry Ford Health System, Detroit, MI, USA. 3. Department of Radiology, Henry Ford Health System, Detroit, MI, USA. 4. Department of Public Health Sciences, Henry Ford Health System, Detroit, MI, USA. 5. Department of Orthopaedic Surgery, Henry Ford Health System, Detroit, MI, USA.
Abstract
BACKGROUND: The incidence of asymptomatic rotator cuff tears has been reported to range from 15% to 39%, but the influence of asymptomatic rotator cuff pathology on shoulder function is not well understood. This study assessed the effects of asymptomatic rotator cuff pathology on shoulder kinematics, strength, and patient-reported outcomes. METHODS: A clinical ultrasound examination was performed in 46 asymptomatic volunteers (age: 60.3 ± 7.5 years) with normal shoulder function to document the condition of their rotator cuff. The ultrasound imaging identified the participants as healthy (n = 14) or pathologic (n = 32). Shoulder motion was measured with a biplane x-ray imaging system, strength was assessed with a Biodex (Biodex Medical Systems, Inc., Shirley, NY, USA), and patient-reported outcomes were assessed using the Western Ontario Rotator Cuff Index and visual analog scale pain scores. RESULTS: Compared with healthy volunteers, those with rotator cuff pathology had significantly less abduction (P = .050) and elevation (P = .041) strength, their humerus was positioned more inferiorly on the glenoid (P = .018), and the glenohumeral contact path length was longer (P = .007). No significant differences were detected in the Western Ontario Rotator Cuff Index, visual analog scale, range of motion, or acromiohumeral distance. CONCLUSIONS: The differences observed between the healthy volunteers and those with asymptomatic rotator cuff pathology lend insight into the changes in joint mechanics, shoulder strength, and conventional clinical outcomes associated with the early stages of rotator cuff pathology. Furthermore, these findings suggest a plausible mechanical progression of kinematic and strength changes associated with the development of rotator cuff pathology.
BACKGROUND: The incidence of asymptomatic rotator cuff tears has been reported to range from 15% to 39%, but the influence of asymptomatic rotator cuff pathology on shoulder function is not well understood. This study assessed the effects of asymptomatic rotator cuff pathology on shoulder kinematics, strength, and patient-reported outcomes. METHODS: A clinical ultrasound examination was performed in 46 asymptomatic volunteers (age: 60.3 ± 7.5 years) with normal shoulder function to document the condition of their rotator cuff. The ultrasound imaging identified the participants as healthy (n = 14) or pathologic (n = 32). Shoulder motion was measured with a biplane x-ray imaging system, strength was assessed with a Biodex (Biodex Medical Systems, Inc., Shirley, NY, USA), and patient-reported outcomes were assessed using the Western Ontario Rotator Cuff Index and visual analog scale pain scores. RESULTS: Compared with healthy volunteers, those with rotator cuff pathology had significantly less abduction (P = .050) and elevation (P = .041) strength, their humerus was positioned more inferiorly on the glenoid (P = .018), and the glenohumeral contact path length was longer (P = .007). No significant differences were detected in the Western Ontario Rotator Cuff Index, visual analog scale, range of motion, or acromiohumeral distance. CONCLUSIONS: The differences observed between the healthy volunteers and those with asymptomatic rotator cuff pathology lend insight into the changes in joint mechanics, shoulder strength, and conventional clinical outcomes associated with the early stages of rotator cuff pathology. Furthermore, these findings suggest a plausible mechanical progression of kinematic and strength changes associated with the development of rotator cuff pathology.
Authors: Michael J Bey; Cathryn D Peltz; Kristin Ciarelli; Stephanie K Kline; George W Divine; Marnix van Holsbeeck; Stephanie Muh; Patricia A Kolowich; Terrence R Lock; Vasilios Moutzouros Journal: Am J Sports Med Date: 2011-07-07 Impact factor: 6.202
Authors: Bryan T Kelly; Riley J Williams; Frank A Cordasco; Sherry I Backus; James C Otis; Daniel E Weiland; David W Altchek; Edward V Craig; Thomas L Wickiewicz; Russell F Warren Journal: J Shoulder Elbow Surg Date: 2005 Mar-Apr Impact factor: 3.019
Authors: Yebin Jiang; Jenny Zhao; Marnix T van Holsbeeck; Michael J Flynn; Xiaolong Ouyang; Harry K Genant Journal: Skeletal Radiol Date: 2002-07-13 Impact factor: 2.199
Authors: Luke T Mattar; Adam J Popchak; William J Anderst; Volker Musahl; James J Irrgang; Richard E Debski Journal: J Shoulder Elbow Surg Date: 2022-01-26 Impact factor: 3.507