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At least 1,297 records · Page 72Linked to original sources
PubMed2005

Heterotopic ossification of the supraspinatus tendon after rotator cuff repair: case report.

Heterotopic ossifications of the shoulder are uncommon. Rarely, these ossifications are seen after open or even arthroscopic shoulder surgical procedures. Here, we report a patient who underwent a rotator cuff repair, complicated with an axillary nerve paralysis. Postoperatively he developed substantial ossification of the supraspinatus tendon. A review of the literature was done. To our knowledge no other cases similar to this have been reported.

Aged↗
PubMed1998

A technique for determining the spatial relationship between the rotator cuff and the subacromial space in arm abduction using MRI and 3D image processing.

An MR imaging-based technique for three-dimensional determination of subacromial space width in relation to the rotator cuff in arm abduction is presented. Five volunteers were examined in an open MRI in seven arm positions, and coronal images were obtained with a gradient-echo sequence. 3D reconstruction of the bones and the supraspinatus was performed, and the minimal spatial distances between acromion, clavicle, and humerus were calculated. The closest contact between the supraspinatus and the anterior inferior part of the acromion occurred at 90 degrees abduction in internal rotation. The technique presented allows investigation of the morphological basis of the impingement syndrome.

Acromion↗
PubMed1982

Rotator cuff tears: the role of surgery.

The indications for operative intervention in patients with rotator cuff tears and the reasonable expectations of such surgery are not well defined. This retrospective study of 37 such patients treated operatively at Ottawa General Hospital showed good results in 65% of cases. However, efforts to re-establish continuity of the cuff did not always result in a permanent cuff reconstruction. The persisting defect did not impede functional recovery as long as the edges of the tear were debrided along with division of the coracoacromial ligament, acromioplasty, or excision of osteophytes at the greater tuberosity. Impingement plays a major role in the disability associated with this condition.

Adult↗
PubMed2006

Commercial extracellular matrix scaffolds for rotator cuff tendon repair. Biomechanical, biochemical, and cellular properties.

BACKGROUND: We are not aware of any in vitro study comparing the biomechanical, biochemical, and cellular properties of commercial extracellular matrix materials marketed for rotator cuff tendon repair. In this study, the properties of GraftJacket, TissueMend, Restore, and CuffPatch were quantified and compared with each other. The elastic moduli were also compared with that of normal canine infraspinatus tendon. METHODS: Samples were tested from different manufacturing lots of four materials: GraftJacket (ten lots), TissueMend (six), Restore (ten), and CuffPatch (six). The Kruskal-Wallis test was used to compare thickness, stiffness, and modulus as well as hydroxyproline, chondroitin/dermatan sulfate glycosaminoglycan, hyaluronan, and DNA contents among these matrices. The moduli of the extracellular matrices were also compared with those of normal canine infraspinatus tendon. RESULTS: All four extracellular matrices required 10% to 30% stretch before they began to carry substantial load. Their maximum moduli were realized in their linear region at 30% to 80% strain. The elastic moduli of all four commercial matrices were an order of magnitude lower than that of canine infraspinatus tendon. TissueMend had significantly higher DNA content than the other three matrices (p<0.0001), although both Restore and GraftJacket also had measurable amounts of DNA. CONCLUSIONS: Our data demonstrate chemical and mechanical differences among the four commercial extracellular matrices that we evaluated. Probably, the source (dermis or small intestine submucosa), species (human, porcine, or bovine), age of the donor (fetal or adult), and processing of these matrices all contribute to the unique biophysical properties of the delivered product. The biochemical composition of commercial extracellular matrices is similar to that of tendon. However, the elastic moduli of these materials are an order of magnitude lower than that of tendon, suggesting a limited mechanical role in augmentation of tendon repair.

Animals↗
PubMed2004

Rates of carpal tunnel syndrome, epicondylitis, and rotator cuff claims in Ontario workers during 1997.

The primary objective of this research was the calculation of crude and specific rates of first-allowed, lost-time carpal tunnel syndrome (CTS), epicondylitis, and rotator cuff syndrome/tear (RCS/RCT) claims in Ontario workers during 1997. A secondary objective was to determine if results related to these diagnoses were consistent with findings for all cumulative trauma disorders affecting the specific part of upper extremity region. Rates were calculated by combining claim counts and population "at-risk" estimates derived from the Ontario Workplace Safety and Insurance Board databases and Canadian Labour Force Survey, respectively. The prevention index was used to prioritize occupations for intervention. Gender-specific rates declined as one moved proximally along the upper extremity. Similarly, female to male claim rate ratios declined from 1.61 for CTS to 0.47 for RCS/RCT. Frequently occurring highest rate and prevention index occupational categories across gender and diagnoses included "textiles, furs & leathergoods" and "other machining occupations". Diagnosis-specific findings were consistent with previously reported part of upper extremity findings.

Adolescent↗
PubMed2000

Comparison of muscle sizes and moment arms of two rotator cuff muscles measured by ultrasonography and magnetic resonance imaging.

OBJECTIVE: The purpose was to investigate ultrasound (US) and anthropometry (AN) as valid alternatives to magnetic resonance imaging (MRI) regarding muscle size characteristics of two rotator cuff muscles. METHODS: Eight healthy females (age 27-54 yrs.) went through MRI and US scannings and AN measurements, where muscle thickness, cross-section area (CSA), moment arm, muscle length and width were measured on supraspinatus and infraspinatus muscle. RESULTS: The agreement between the methods was very satisfactory for CSA, and satisfactory for muscle thickness, moment arm, muscle length and width, with a mean difference below 2 mm in thickness and below 5 mm in muscle length and width. Volume could be estimated satisfactory in supraspinatus muscle, but not in infraspinatus muscle, where volume had to be calculated from thickness, length and width. As a significant relation was found in the MRI measurements between thickness and CSA, thickness measurements may replace CSA in inaccessible muscles. CONCLUSIONS: US was a valid method in measuring CSA, muscle thickness and moment arm. Combined with anthropometric measures of muscle length and width, volume can be calculated, which is important when defining the physiological cross-sectional area and muscle function. Further development and validation of the method is needed, however.

Adult↗
PubMed2005

Imaging findings of spontaneous detachment of the deltoid muscle as a complication of massive rotator cuff tear.

A tear at the origin of the deltoid muscle is uncommon and usually occurs as a complication of shoulder surgery. We report a case of spontaneous deltoid detachment as a complication of massive rotator cuff tear in a 70-year-old woman evaluated by standard radiographs, ultrasound, arthrography and MR-arthrography. We present the multimodality imaging findings with review of the literature. We found that ultrasound is an accurate modality in detecting and assessing spontaneous detachment of the deltoid muscle. As ultrasound is a noninvasive, low-cost, and universally available imaging modality we suggest using ultrasound as the first modality for evaluation of spontaneous detachment of the deltoid muscle.

Aged↗