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Biomechanical evaluation of different designs of glenospheres in the SMR reverse total shoulder prosthesis: Range of motion and risk of scapular notching
- Source :
- Journal of Shoulder and Elbow Surgery. 18:354-359
- Publication Year :
- 2009
- Publisher :
- Elsevier BV, 2009.
-
Abstract
- Background Reverse total shoulder arthroplasty is a treatment option for cuff tear arthropathy. Scapular notching remains a concern. This biomechanical study compared the range-of-motion in different designs of glenospheres and hence the relative risk of scapular notching. Method A precision coordinate device was used to investigate four different designs of glenospheres (SMR prosthesis); 36mm concentric (Standard), 36 mm eccentric, 44 mm concentric, and 44 mm eccentric glenospheres. The centre of rotation in each design was first established. The position of the humeral prosthesis was recorded in the plane of the scapula to compare the degree of adduction and the total range-of-motion. Results Eccentric glenospheres were found to improve range-of-motion by allowing a higher degree of adduction. Larger diameter glenospheres were found to improve range-of-motion by increasing adduction and abduction. Compared to the 36 mm concentric (standard) glenosphere, the 36 mm eccentric glenosphere improved adduction by 14.5 degrees, the 44 mm concentric glenosphere improved adduction by 11.6 degrees, the 44 mm eccentric glenosphere improved adduction by 17.7 degrees. Conclusion Eccentric glenospheres with a center-of-rotation placed more inferiorly were shown to improve adduction. This design may reduce the clinical incidence of scapular notching. Level of evidence Basic science study.
- Subjects :
- Joint Instability
medicine.medical_specialty
Joint Prosthesis
Concentric
Prosthesis Design
Sensitivity and Specificity
Scapula
medicine
Humans
Eccentric
Computer Simulation
Orthopedics and Sports Medicine
Arthroplasty, Replacement
Range of Motion, Articular
Probability
Orthodontics
Analysis of Variance
Shoulder Joint
business.industry
Biomechanics
General Medicine
Shoulder Prosthesis
Biomechanical Phenomena
Surgery
medicine.anatomical_structure
Shoulder Impingement Syndrome
Shoulder joint
Stress, Mechanical
Range of motion
business
Subjects
Details
- ISSN :
- 10582746
- Volume :
- 18
- Database :
- OpenAIRE
- Journal :
- Journal of Shoulder and Elbow Surgery
- Accession number :
- edsair.doi.dedup.....d1660b4e26b00785730479bf2ef22a58