The Rosenberg view is a specialised radiographic technique used to assess degenerative changes in the knee joint, particularly for identifying joint space narrowing due to cartilage loss. It is performed as a posterior-anterior weight-bearing view with the knee in 30 degrees of flexion. This position is crucial because the maximum stresses in the knee occur between 30 and 60 degrees of flexion, making it ideal for detecting early degenerative changes.
In comparison, standard anteroposterior weight-bearing radiographs taken with the knee in full extension are less sensitive for detecting cartilage loss. This is because joint space narrowing may not be as evident when the knee is fully extended, especially in the early stages of osteoarthritis or other degenerative conditions.
Key Findings from Radiographs
- Figure (a): Radiograph in full extension showing generalised degenerative changes.
- Figure (b): Radiograph in 30 degrees of flexion (Rosenberg view) showing specifically marked degenerative changes in the lateral tibio-femoral compartment.
The Rosenberg view offers a more sensitive and specific assessment of joint space narrowing compared to conventional methods, making it particularly useful for evaluating early degenerative changes in the knee.
Reference:
J Bone Joint Surg [Br]. 1999;81-B:632-5.
