An anatomical study of the transverse part of the infraspinatus muscle that is closely related with the supraspinatus muscle

Kato, Atsuo; Nimura, Akimoto; Yamaguchi, Kumiko; Mochizuki, Takashi; Sugaya, Hiroyuki; Akita, Keiichi

doi:10.1007/s00276-011-0872-0

Cited by 45 publications

(59 citation statements)

References 28 publications

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“…The larger, lower oblique part of infraspinatus sits below the transverse part of the muscle, which lies just below and in parallel, with supraspinatus. 25 It is also suggested that the transverse part of infraspinatus shares an innervation with supraspinatus, different to the oblique part of infraspinatus. 25 The structure of infraspinatus may be central to the difficulty in isolating it from supraspinatus.…”

Section: Discussionmentioning

confidence: 98%

“…25 It is also suggested that the transverse part of infraspinatus shares an innervation with supraspinatus, different to the oblique part of infraspinatus. 25 The structure of infraspinatus may be central to the difficulty in isolating it from supraspinatus. Not only does its insertion extend more anteriorly than previously thought, but also the structure of the muscle, with the transverse part possibly being more closely related to supraspinatus morphologically, may mean that it may not act as one, with different parts of the muscle being activated in a different manner.…”

Section: Discussionmentioning

confidence: 98%

“…Kato et al 25 highlighted two parts of infraspinatus based on muscle fibre direction. The larger, lower oblique part of infraspinatus sits below the transverse part of the muscle, which lies just below and in parallel, with supraspinatus.…”

Section: Discussionmentioning

confidence: 99%

“…These findings of close proximity of insertion or part common insertion may explain why infraspinatus may play a primary role in shoulder abduction along with supraspinatus and why most rotator cuff tears may involve the infraspinatus tendon. 25 It may also be the mechanism for supraspinatus involvement in external rotation and could even be the primary reason for difficulty in isolating infraspinatus from supraspinatus.…”

Section: Discussionmentioning

confidence: 99%

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Identifying shoulder testing positions and movements that isolate infraspinatus from supraspinatus

Hughes¹,

Taylor²,

Green³

2015

Physical Therapy Reviews

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Background: Clinical diagnosis of rotator cuff pathology is inaccurate. The difficulty of differentiation of supraspinatus and infraspinatus may contribute to diagnostic inaccuracy. Objective: To identify the characteristics of infraspinatus function that might isolate electromyographic activity of this muscle from that of supraspinatus, forming the basis for a clinical test for infraspinatus pathology. Methods: Key databases were searched using the single term 'infraspinatus'. Inclusion criteria involved infraspinatus muscle activation. Two reviewers independently applied inclusion/exclusion criteria to title and abstracts. Quality of included studies was assessed. Actions involving markedly high infraspinatus electromyographic (EMG) activity and a high ratio of infraspinatus to supraspinatus activity were identified. Results: Fifty-three articles were included from an initial yield of 1175. For many movements supraspinatus was co-active with infraspinatus. Most isolated EMG activity was seen during resisted shoulder external rotation in a variety of positions and in flexion with a longitudinal humeral force.Conclusions: It appears difficult to isolate infraspinatus from supraspinatus in the clinical setting. However, infraspinatus may be relatively isolated from supraspinatus by resisting an external rotation force, potentially in the position of shoulder flexion with a longitudinal humeral force applied.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Identifying shoulder testing positions and movements that isolate infraspinatus from supraspinatus

Hughes¹,

Taylor²,

Green³

2015

Physical Therapy Reviews

View full text Add to dashboard Cite

show abstract

“…In support of this, a recent study has proposed a novel anatomical and functional perspective of the insertion anatomy of the cuff into the greater tuberosity, and related studies have been performed to support these findings. 5,6) For instance, Kato et al 7) described the infraspinatus 31 tendon in terms of the direction of fibrosis: the oblique component and the transverse component. Using their method to divide the infraspinatus muscle into four compartments, Matsuki et al 8) found that the superior compartment was associated with around half the tears of the anterior infraspinatus whereas the inferior compartment was associated with half the tears of the posterior infraspinatus.…”

Section: Introductionmentioning

confidence: 99%

Isolated Ruptures of the Infraspinatus: Clinical Characteristics and Outcomes

Lee¹,

Kim²,

Oh³

2017

Clinics in Shoulder and Elbow

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Background: Isolated infraspinatus tear is very rare and clinical features are not as well known, therefore the purpose of this study was to evaluate clinical characteristics and outcomes of isolated infraspinatus tear that authors experienced. Methods: Authors reviewed 288 cases of full-thickness rotator cuff tear involving infraspinatus between 2010 and 2015, and retrospectively analyzed six cases of isolated infraspinatus tear. Perioperative clinical characteristics, postoperative functional outcomes of 6 months were investigated. Functional evaluation included visual analogue scale (VAS), range of motions, American Shoulder and Elbow Surgeons (ASES) score, and Constant score. Results: Calcific tendinitis was accompanied in 4 cases (66.7%). Three of them received steroid injection or aspiration or extracorporeal shockwave therapy. Mean preoperative pain VAS was 7.1 (range, 5-9), and mean postoperative pain VAS at 6 months later was 1.6 (range, 0-5). Preoperative muscle strength by isokinetic muscle performance test showed 52% deficit of abduction and 37.6% deficit of external rotation. All 6 patients had arthroscopic repair of the infraspinatus tendon. All the patients at the 6 months follow-up exhibited clinical improvement in the Constant score (67.8 [range, 45-77] Conclusions: Isolated infraspinatus tendon tear was frequently accompanied by calcific tendinitis, but pathophysiologic relationship should need more study. To rule out neurogenic etiology, magnetic resonance imaging and electromyography would be helpful. Arthroscopic infraspinatus tendon repair and supraspinatus debridement showed relatively good result in painful shoulder. (Clin Shoulder Elbow 2017;20(1):30-36)

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Characterizing the Myoarchitecture of the Supraspinatus and Infraspinatus Muscles With MRI Using Diffusion Tensor Imaging

Tous

Jodoin

Pontré

et al. 2023

Magnetic Resonance Imaging

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BackgroundThe societal cost of shoulder disabilities in our aging society keeps rising. Providing biomarkers of early changes in the microstructure of rotator cuff (RC) muscles might improve surgical planning. Elevation angle (E1A) and pennation angle (PA) assessed by ultrasound change with RC tears. Furthermore, ultrasounds lack repeatability.PurposeTo propose a repeatable framework to quantify the myocyte angulation in RC muscles.Study TypeProspective.SubjectsSix asymptomatic healthy volunteers (1 female aged 30 years; 5 males, mean age 35 years, range 25–49 years), who underwent three repositioned scanning sessions (10 minutes apart) of the right infraspinatus muscle (ISPM) and supraspinatus muscle (SSPM).Field Strength/Sequence3‐T, T1‐weighted and diffusion tensor imaging (DTI; 12 gradient encoding directions, b‐values of 500 and 800 s/mm2).AssessmentEach voxel was binned in percentage of depth defined by the shortest distance in the antero‐posterior direction (manual delineation), i.e. the radial axis. A second order polynomial fit for PA across the muscle depth was used, while E1A described a sigmoid across depth: .Statistical TestsRepeatability was assessed with the nonparametric Wilcoxon's rank‐sum test for paired comparisons across repeated scans in each volunteer for each anatomical muscle region and across repeated measures of the radial axis. A P‐value <0.05 was considered statistically significant.ResultsIn the ISPM, E1A was constantly negative, became helicoidal, then mainly positive across the antero‐posterior depth, respective at the caudal, central and cranial regions. In the SSPM, posterior myocytes ran more parallel to the intramuscular tendon (), while anterior myocytes inserted with a pennation angle (). E1A and PA were repeatable in each volunteer (error < 10%). Intra‐repeatability of the radial axis was achieved (error < 5%).Data ConclusionElA and PA in the proposed framework of the ISPM and SSPM are repeatable with DTI. Variations of myocyte angulation in the ISPM and SSPM can be quantified across volunteers.Evidence Level2Technical EfficacyStage 2

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An anatomical study of the transverse part of the infraspinatus muscle that is closely related with the supraspinatus muscle

Abstract: Basic science study.

Cited by 45 publications

References 28 publications

Identifying shoulder testing positions and movements that isolate infraspinatus from supraspinatus

Identifying shoulder testing positions and movements that isolate infraspinatus from supraspinatus

Isolated Ruptures of the Infraspinatus: Clinical Characteristics and Outcomes

Characterizing the Myoarchitecture of the Supraspinatus and Infraspinatus Muscles With MRI Using Diffusion Tensor Imaging

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