Answer:
ACROMIOCLAVICULAR JOINT INJURY GRADE 1
Findings:
Plain Xray Shoulder shows increased Acromioclavicular Joint space . The lucency in superolateral humeral head should not be mistaken for a lytic lesion. It is the typical site and appearance for a Pseudolesion or Pseudocyst and reflects underlying decreased cortica bone in this region.
Discussion:
It is important to identify an increased acromio clavicular joint space and coraco clavicular distance in plain X Ray as this reflects Acromioclavicular Joint Dislocations . The normal acromioclavicular joint space is 1-3mm. An ACJ width of greater than 7 mm in men and 6 mm in women is pathologic. MRI identifies the integrity of the ACJ ligaments . ACJ injuries have been graded 1 to 6 by Rockwell based on integrity of acromioclavicular and coracoclavicular ligaments. The ligaments are intact in Grade 1 and disrupted in other subtypes.
Contributed By: Dr. Babu Peter MD. DNB
Associate Professor, Barnard Institute of Radiology, Chennai
Senior Consultant Radiologist, Aarthi Scans, Chennai
ACROMIOCLAVICULAR JOINT INJURY GRADE 1
Findings:
Plain Xray Shoulder shows increased Acromioclavicular Joint space . The lucency in superolateral humeral head should not be mistaken for a lytic lesion. It is the typical site and appearance for a Pseudolesion or Pseudocyst and reflects underlying decreased cortica bone in this region.
Discussion:
It is important to identify an increased acromio clavicular joint space and coraco clavicular distance in plain X Ray as this reflects Acromioclavicular Joint Dislocations . The normal acromioclavicular joint space is 1-3mm. An ACJ width of greater than 7 mm in men and 6 mm in women is pathologic. MRI identifies the integrity of the ACJ ligaments . ACJ injuries have been graded 1 to 6 by Rockwell based on integrity of acromioclavicular and coracoclavicular ligaments. The ligaments are intact in Grade 1 and disrupted in other subtypes.
Contributed By: Dr. Babu Peter MD. DNB
Associate Professor, Barnard Institute of Radiology, Chennai
Senior Consultant Radiologist, Aarthi Scans, Chennai