Observational studySurgical and radiologic anatomy : SRA2021
Shoulder scaption is dependent on the behavior of the different partitions of the infraspinatus muscle.
Observational study in Surgical and radiologic anatomy : SRA, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed, 16 citations in OpenAlex.
- Compensatory activation of the deltoid and remaining rotator cuff muscles in patients with rotator cuff tears using real-time tissue elastography.Archives of orthopaedic and trauma surgery · 2026Article
- In Vivo Long Head of the Biceps Tendon Stiffness Varies with Forearm Position During Active Contraction: Implications for Personalized Rehabilitation After SLAP Lesions.Journal of personalized medicine · 2026Article
- Postoperative infraspinatus contractility is associated with acromiohumeral distance after arthroscopic rotator cuff repair.European journal of orthopaedic surgery & traumatology : orthopedie traumatologie · 2026Observational
- Subregions of the Rotator Cuff Muscles Present Distinct Anatomy, Biomechanics, and Function.Sports (Basel, Switzerland) · 2024Review
- Tension Distribution in Articular Surfaces of the Rotator Cable and Crescent: A Cadaveric Study.The Journal of bone and joint surgery. American volume · 2024Article
- Strain distribution in the bursal rotator cuff based on whole-muscle and muscle subregion-specific loading: A cadaveric study.Journal of orthopaedic research : official publication of the Orthopaedic Research Society · 2023Article
- Moment arms of the anatomical subregions of the rotator cuff muscles during shoulder rotation.Clinical biomechanics (Bristol, Avon) · 2023Article
- The functional role of the supraspinatus and infraspinatus muscle subregions during forward flexion: a shear wave elastography study.JSES international · 2022Article
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Authors and funding
4 authors at 2 institutions in 2 countries.
Funding
Abstract
purposeThe purpose of this study was to investigate if the three partitions (superior, middle, and inferior partitions) of the infraspinatus muscle previously described in anatomical studies will present different behavior during scapular plane abduction (scaption) as described using shear-wave elastography, especially during initial range of motion.
methodsEight volunteers held their arm against gravity 15° intervals from 30° to 150° in scaption. Shear-wave elastography was implemented at each position to measure shear modulus at rest and during muscle contraction, as a surrogate for muscle stiffness, of each partition. Muscle activity was defined as the difference in stiffness values between the resting positions and those during muscle contraction (ΔE = stiffness at contraction-stiffness at rest).
resultsThe activity value for the middle partition was 25.1 ± 10.8 kPa at 30° and increased up to 105° (52.2 ± 10.8 kPa), with a subsequent decrease at larger angle positions (p < .001). The superior partition showed a flatter and constant behavior with smaller activity values except at higher angles (p < .001). Peak activity values for the superior partition were observed at 135° (23.0 ± 12.0 kPa). Increase activity for inferior partition began at 60° and showed a peak at 135° (p < .001; 32.9 ± 13.8 kPa).
conclusionStiffness measured using shear-wave elastography in each partition of the infraspinatus muscle demonstrated different behavior between these partitions during scaption. The middle partition generated force throughout scaption, while the superior and inferior partitions exerted force at end range.
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