Mr Hahnel has performed well in excess of a thousand knee replacements and has been a Consultant orthopaedic surgeon since 2011. He works in the NHS performing hip and knee replacements as well as looking after sports injuries (including knee arthroscopy). He is a NHS trainer and a member of Zimmer teaching Faculty. He has excellent clinical outcome data as shown by the National Joint Register and excellent patient reported outcome measures. 
His revision funnel plot data from the national joint register as well as PROMS data are as below. Latest data shows that he is in the top 0.1% of surgeons for knee replacements in the UK. For a full explanation of the images and what they mean please click on the image.

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When is the right time for a knee replacement?
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Knee pain can be a debilitating condition to many and can cause problems with day-to-day mobility, whether that’s whilst working, enjoying time with the family or even walking to the shops.
Knee joints are weight-bearing and often succumb to wear-and-tear throughout an individual’s lifetime, particular if their career or lifestyle has put increased stress on these joints.
If you’ve consulted with your GP or a medical professional, who has discussed knee surgery as an option and other treatments have failed, such as medication, then you may wish to seek knee replacement.

What is a total knee replacement?​
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Pain from an arthritic knee can be very disabling and often affects every aspect of your daily life. If your pain is not helped by taking pain killers or simple modifications to your daily activities a knee replacement can remove your pain and restore your mobility. This will allow you to regain function and enhance your quality of life.
The pain of arthritis is caused by the rough bone surfaces grinding together producing inflammation and swelling. A knee replacement removes the worn-out moving surfaces of your knee. The ends of the thigh bone (femur) and shin bone (tibia) are replaced with metal implants that glide against a hard-wearing plastic insert allowing pain free motion.

What does a partial knee replacement involve?

For some patients knee arthritis is localised to just one part of the knee. In these patients it is possible to treat their arthritis by just replacing the worn part of the knee, leaving the rest of the knee untouched. This may involve replacing the inner or outer aspects of the joint, or the patello-femoral joint (knee cap).
Partial knee replacement has some potential advantages over total knee replacement in the appropriate patient. It is a smaller operation meaning that post- operative pain is usually less and recovery is typically quicker. As the unaffected ligaments and joint surfaces are left intact the knee moves and feels more like a natural knee. This means that post- operative range of movement, function and patient satisfaction are often higher when compared to total knee replacement patients.