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What are the parts of human knee and which among them commonly gets involved in arthritis?


The knee joint is a cluster of three small compartments, namely the inner (medial), outer (lateral) and the knee cap (patella-femoral) compartment.

Arthritis due to aging usually affects the medial or inner compartment. In other words wear and tear of the knee has a strong tendency to restrict itself to a particular compartment, most commonly the inner one.

What is partial knee Replacement?

Partial knee Replacement is a surgical procedure done to replace the worn-out inner compartment of the knee (white arrow).

Unlike total knee replacement where the entire joint is replaced, in partial knee replacement at least 70% of the knee joint is preserved.

What is Patello-Femoral (Kneecap) Replacement?

The Patello-Femoral or the kneecap Replacement is done when the wear and tear is limited to the knee cap compartment (White arrow).

Such isolated knee cap arthritis can occur after a previous fracture of the knee cap or a developmental abnormality involving the knee cap.

What are the advantages of partial knee Replacement?

1. Preservation of unaffected bone, cartilage, ligaments and soft tissues

2. Normal joint function and better knee bending

3. Better sensory feedback

4. Faster recovery after surgery

5. Smaller incisions and small scar

6. Limited disturbance of the tissues

7. Less blood loss and less pain.

Chapters & International Research Publications

Dr. Raj Kanna has published a number of papers on Partial Knee Replacement in reputed International Journals that include:

1. Modular Bicompartmental Knee Arthroplasty: Indications, technique, prosthetic design, and results. Accepted in Acta Orthopaedica Belgica, Vol.83 -1- 2017

2. Patello-Femoral Arthroplasty in a bilateral Syme’s Amputee – a case report. J Clin Orthop Trauma. 2016 Jan-Mar; 7(1): 40-4

3. Post-Operative Limb Alignment And its Determinants after Minimally Invasive Oxford Medial Unicompartmental Knee. Journal of Arthroplasty Sep 2011, 26(6); 919-25.

4. Dr. Kanna has also coauthored a chapter titled Uni-Compartmental Knee Arthroplasty for the second edition of the book titled Textbook of Orthopaedics and Trauma published by the Indian Orthopaedic Association.