Birmingham Knee Replacement (BKR)


The Birmingham Knee Replacement (BKR) has been developed to address the poor patient satisfaction scores commonly associated with “regular” knee replacements on the market.

Studies have shown that 20% of patients with regular Total Knee Replacements (TKRs) are dissatisfied with their knee function in the months and years following surgery  . The main issue is that these knee implants fail to accurately replicate physiological knee function. Consequently regular TKRs cause pain and tightness at the front of the knee, limited leg flexion and difficulty with day-to-day activities when implanted in patients. It is no secret that many patients with these types of TKR have to give up activities and hobbies altogether following surgery.

The BKR is unique because it closely matches the anatomy and kinematics of the natural knee structure. In contrast, BKR patients are able to be highly active following surgery; getting back to golf, skiing, cycling and more.


Orthopaedic research reveals the condyles of the knee are a subtle, spiral shape. This unique shape allows the patella to translate across to the outside of the leg during flexion. The effect is easily observed by lightly touching your knee cap whilst bending your leg.

Regular TKRs, unfortunately, do not take this spiral anatomy into account; they have straight condyles which force the patellar into an up and down motion during flexion, trapping it in the mid line. And, since the patellar cannot follow its intended motion to the outside of the leg, it becomes painfully displaced by up to 10mm during flexion.

The BKR’s patented spiral condyles offer congruence deep into flexion providing superb stability, extremely low wear rates, accurate patellar tracking and improved knee function for active patients.

The BKR is demonstrating good results at early follow-up in terms of:

  • Better patient satisfaction

  • Excellent patellar tracking, mirroring the natural knee kinematics

  • An increased range of flexion

Design Features of the BKR

For more detailed technical information please click here to watch ‘The BKR: What’s it all about?’


  1. Baker PN, et al; National Joint Registry for England and Wales. The role of pain and function in determining patient satisfaction after total knee replacement. Data from the National Joint Registry for England and Wales. Journal Bone Joint Surgery Br. 2007 Jul; 89(7): 893-900