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Anatomy

Upper Limb

Question 49 of 180

A patient presents to ED having injured his right shoulder playing basketball. You establish he has torn the most commonly injured rotator cuff muscle. Which of the following movements would you most expect to be impaired:

Answer:

The supraspinatus is the most commonly injured rotator cuff muscle - it acts to initiate abduction to 15 degrees, and then assists the deltoid with continued abduction.

Rotator Cuff Injury

Anatomy / Upper Limb / Shoulder

Last Updated: 25th January 2019

The two main disorders of the rotator cuff are impingement and tendinopathy.

The supraspinatus muscle is the most commonly injured rotator cuff muscle as it passes beneath the acromion and the acromioclavicular ligament. This space is fixed, therefore any swelling of the supraspinatus muscle, excessive fluid in the subacromial/subdeltoid bursa or subacromial bony spurs, may produce significant impingement when the arm is abducted. The blood supply to the supraspinatus tendon is relatively poor and the tendon is susceptible to degenerative change, which in turn, makes it more susceptible to trauma and partial or full-thickness tears may occur. This will result in painful or weak abduction of the arm at the shoulder.

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  • Biochemistry
  • Blood Gases
  • Haematology
Biochemistry Normal Value
Sodium 135 – 145 mmol/l
Potassium 3.0 – 4.5 mmol/l
Urea 2.5 – 7.5 mmol/l
Glucose 3.5 – 5.0 mmol/l
Creatinine 35 – 135 μmol/l
Alanine Aminotransferase (ALT) 5 – 35 U/l
Gamma-glutamyl Transferase (GGT) < 65 U/l
Alkaline Phosphatase (ALP) 30 – 135 U/l
Aspartate Aminotransferase (AST) < 40 U/l
Total Protein 60 – 80 g/l
Albumin 35 – 50 g/l
Globulin 2.4 – 3.5 g/dl
Amylase < 70 U/l
Total Bilirubin 3 – 17 μmol/l
Calcium 2.1 – 2.5 mmol/l
Chloride 95 – 105 mmol/l
Phosphate 0.8 – 1.4 mmol/l
Haematology Normal Value
Haemoglobin 11.5 – 16.6 g/dl
White Blood Cells 4.0 – 11.0 x 109/l
Platelets 150 – 450 x 109/l
MCV 80 – 96 fl
MCHC 32 – 36 g/dl
Neutrophils 2.0 – 7.5 x 109/l
Lymphocytes 1.5 – 4.0 x 109/l
Monocytes 0.3 – 1.0 x 109/l
Eosinophils 0.1 – 0.5 x 109/l
Basophils < 0.2 x 109/l
Reticulocytes < 2%
Haematocrit 0.35 – 0.49
Red Cell Distribution Width 11 – 15%
Blood Gases Normal Value
pH 7.35 – 7.45
pO2 11 – 14 kPa
pCO2 4.5 – 6.0 kPa
Base Excess -2 – +2 mmol/l
Bicarbonate 24 – 30 mmol/l
Lactate < 2 mmol/l

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