Influence of the shape of the acromion on joint reaction force and humeral head translation during abduction in the scapular plane

Terrier, Alexandre; Reist, Adrian; Nyffeler, Richard W.

doi:10.1016/s0021-9290(06)83218-5

Cited by 3 publications

(2 citation statements)

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“…It was speculated that a high ascending force component favours subacromial impingement and degenerative changes of the supraspinatus tendon, whereas a high compressive force component favours degenerative changes of the glenohumeral joint. Terrier et al 34 conducted a 3D finite element study and confirmed that a large lateral extension of the acromion increases superior translation of the humerus during active elevation of the arm. In another finite element study, Engelhard et al 35 showed that medialisation of the acromion increases glenoid articular cartilage strain.…”

Section: Postulated Patho-mechanismmentioning

confidence: 88%

Acromion and glenoid shape: Why are they important predictive factors for the future of our shoulders?

Nyffeler

Meyer

2017

EFORT Open Reviews

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The shape of the acromion differs between patients with degenerative rotator cuff tears and individuals without rotator cuff pathology.It can be assessed in the sagittal plane (acromion type, acromion slope) and in the coronal plane (lateral acromion angle, acromion index, critical shoulder angle).The inter-observer reliability is better for the measurements in the coronal plane.A large lateral extension (high acromion index or high critical shoulder angle) and a lateral down-sloping of the acromion (low lateral acromion angle) are associated with full-thickness supraspinatus tears.The significance of glenoid inclination for rotator cuff disease is less clear.The postulated patho-mechanism is the compression of the supraspinatus tendon between the humeral head and the acromion. Bursal side tears might be caused by friction and abrasion of the tendon. Articular side tears could be due to impairment of the gliding mechanism between tendon fibrils leading to local stress concentration. Further research is needed to understand the exact pathomechanism of tendon degeneration and tear.Cite this article: EFORT Open Rev 2017;2. DOI: 10.1302/2058-5241.2.160076. Originally published online at www.efortopenreviews.org

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Section: Postulated Patho-mechanismmentioning

confidence: 88%

Acromion and glenoid shape: Why are they important predictive factors for the future of our shoulders?

Nyffeler

Meyer

2017

EFORT Open Reviews

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“…With a smaller acromion, the ascension force decreases whereas the compressive force on the humeral head increases. 21 Terrier et al 26 demonstrated a similar finding in a 3D finite-element study where a larger acromion increased superior translation of the humeral head during active FE . Moor et al 17 applied this idea and further demonstrated an association between smaller CSAs with glenohumeral arthritis and larger CSAs with RCTs.…”

Section: Discussionmentioning

confidence: 64%

The effect of critical shoulder angle on functional compensation in the setting of cuff tear arthropathy

Patel

Abboud

et al. 2020

JSES International

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Introduction Critical shoulder angle (CSA) has been shown to influence rates of rotator cuff tears and glenohumeral arthritis with a larger CSA associated with rotator cuff tears and a smaller CSA associated with glenohumeral arthritis. There has been no study to determine whether such radiographic measurement influences the function of patients with demonstrated cuff tear arthropathy (CTA). The purpose of this study was to examine whether smaller CSAs were associated with greater range of motion (ROM) in patients diagnosed with CTA. Materials and methods Ninety-three patients with a diagnosis of CTA with adequate anteroposterior shoulder radiographs were included in the study. Patient demographics were recorded. The presence of a rotator cuff tear was confirmed via advanced imaging or when applicable via the operative report. Patients' ROM was evaluated through the physician's office note. Shoulder radiographs were used to measure CSA, glenoid inclination, acromial index (AI), and acromiohumeral interval. Patient ROM was measured and grouped into 2 different tiered cohorts: cohort 1 had 4 subgroups of forward elevation (FE) (ie, ≤45°, 45°-90°, 91°-135°, and 136°-180°) and cohort 2 had 2 subgroups of FE (ie, ≤90° and >90°). We then analyzed FE between these groups in the context of their radiographic measurements. Results The average patient age was 73.8 ± 8.0 years. There was no significant difference in acromiohumeral interval. AI was found to be significantly different between patients presenting with ≤90° in FE compared with those >90° ( P = .02). Average CSA was significantly lower in patients with FE greater than 90° at 33.7° ± 3.9° compared with patients with FE less than 90° at 37.1° ± 6.3° ( P = .002). There was also a significant difference with regard to CSAs, with those patients with FE ≤ 45° having a mean CSA of 38.2° ± 8.3° compared with those patients with FE ≥ 135° having a mean CSA of 33.3° ± 4.3° ( P = .02). Conclusion Patients diagnosed with CTA can significantly vary in their shoulder function and ability to forward elevate. Lower CSA was found to be associated with higher FE in patients with CTA preoperatively. In addition, patients with a smaller AI were also found to have better overhead function. Analyzing CSA on plain radiographs may help manage functional expectations in patients with CTA.

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Sub-acromion impingement syndrome: Scapular morphometric analysis: A study on dry bones among Eastern Indian population

Poddar¹,

Dutta²

2022

J Anat Soc India

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Influence of the shape of the acromion on joint reaction force and humeral head translation during abduction in the scapular plane

Cited by 3 publications

References 0 publications

Acromion and glenoid shape: Why are they important predictive factors for the future of our shoulders?

Acromion and glenoid shape: Why are they important predictive factors for the future of our shoulders?

The effect of critical shoulder angle on functional compensation in the setting of cuff tear arthropathy

Sub-acromion impingement syndrome: Scapular morphometric analysis: A study on dry bones among Eastern Indian population

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