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The effects of arm elevation on the 3-dimensional acromiohumeral distance: a biplane fluoroscopy study with normative data
- Source :
- Journal of Shoulder and Elbow Surgery. 21:1593-1600
- Publication Year :
- 2012
- Publisher :
- Elsevier BV, 2012.
-
Abstract
- Hypothesis and background Narrowing of the subacromial space has been implicated in several shoulder pathologies. However, the location of the minimum distance points during clinical testing has not been defined. We sought to measure the in vivo minimum distance and location of the minimum distance points on the acromion and proximal humerus during arm elevation. Methods Eight healthy male subjects (mean age, 30 years) underwent a dynamic in vivo biplane fluoroscopy assessment of scaption and forward elevation. For each frame, the 3-dimensional position and orientation of the humerus and scapula were determined, and the acromiohumeral distance (AHD) was measured as the shortest distance between the acromion and proximal humerus. Results The minimum AHD was 2.6 ± 0.8 mm during scaption and 1.8 ± 1.2 mm during forward flexion at elevation angles of 83° ± 13° and 97° ± 23°, respectively. The minimum distance point was located on the articular surface of the humeral head from the neutral arm position until 34° ± 8° for scaption and 36° ± 6° for forward flexion. Upon further elevation, the minimum distance point was located within the footprint of the supraspinatus muscle until 72° ± 12° for scaption and 65° ± 8° for forward flexion. At greater elevation angles, the minimum distance points were between the acromion and the proximal humeral shaft, distal from the greater tuberosity. Conclusions The shortest AHD was at approximately 90° of arm elevation. The AHD was no longer measured intra-articularly or within the supraspinatus footprint above approximately 70° of arm elevation.
- Subjects :
- Adult
Male
Supraspinatus muscle
Biplane
Rotator Cuff
Imaging, Three-Dimensional
Scapula
Reference Values
medicine
Humans
Orthopedics and Sports Medicine
Humerus
Acromion
Range of Motion, Articular
Shoulder Joint
business.industry
Elevation
Reproducibility of Results
General Medicine
Anatomy
musculoskeletal system
Biomechanical Phenomena
medicine.anatomical_structure
Shoulder Impingement Syndrome
Fluoroscopy
Arm
Surgery
Range of motion
business
Greater Tuberosity
Subjects
Details
- ISSN :
- 10582746
- Volume :
- 21
- Database :
- OpenAIRE
- Journal :
- Journal of Shoulder and Elbow Surgery
- Accession number :
- edsair.doi.dedup.....dfd99d1c87cd5dbe940b57cdc7050a7a