(Fig 3-A.46) Adhesive Capsulitis of the knee

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https://youtu.be/GSIg93UH3Oc

 

📌Adhesive Capsulitis

• Adhesive capsulitis (AC) is a condition characterized by synovial inflammation and capsular fibrosis, leading to fibroblastic infiltration, adhesion, and retraction of the capsule. 
• It was traditionally associated with the glenohumeral (shoulder) joint, but recent evidence suggests it can affect other joints as well.

✅ Multi-Joint Involvement

• AC has been reported in joints such as the wrist, hip, and knee, indicating that it is not unique to the shoulder joint.
• Clinical Presentation: In the classic description of AC, pain presents first, followed by progressive loss of motion. The pain may subside, and motion may or may not be slowly restored.

✅ Imaging Findings: 

• Imaging findings in affected joints include high signal intensity on fluid-sensitive images and contrast enhancement of the pericapsular tissues, such as around the anterior cruciate ligament (ACL), popliteal tendon insertion, and the posteromedial and lateral capsule in the knee.
• De Abreu et al. reported a case of knee pain with high T2 signal diffusely along the ACL, suprapatellar fat pad, and posteromedial capsule. Fluorodeoxyglucose positron emission tomography/computed tomography revealed extensive enhancement of the same structures, as well as the posterior cruciate ligament (PCL), popliteus insertion, posterior capsule, and semimembranosus (SM) insertion.

✅ Diagnosis Confirmation: 

• The diagnosis of AC in this case was confirmed or strengthened by biopsy, with no other findings in the affected knee and a normal contralateral knee.

Magn Reson Imaging Clin N Am 22 (2014) 725–741

Semin Musculoskelet Radiol. 2016 Feb;20(1):12-25

 

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#AdhesiveCapsulitis, #CapsularFibrosis, #SynovialInflammation,#PericapsularTissues, #KneePain, #Fatpad,