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Author Topic: Some new data on how long knee replacements last  (Read 1630 times)

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Offline Brandon123

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Some new data on how long knee replacements last
« on: April 21, 2019, 07:05:23 PM »
According to this article, approximately 82% of TKRs last 25 years and 70% of UKRs (PKRs) last 25 years.

You can access the paper at:
https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(18)32531-5/fulltext


« Last Edit: April 21, 2019, 07:08:23 PM by Brandon123 »
RK sharp pain while running, diagnosis chondromalacia patellae 6/09
RK arthroscopic chondroplasty 9/09
RK rehab, recovery, 90% normal, started running again -> back to square one 5/15
RK diagnosis patellofemoral arthritis + LK diagnosis chondromalacia patellae 8/15 -> conservative treatment

Offline Vickster

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Re: Some new data on how long knee replacements last
« Reply #1 on: April 21, 2019, 08:03:36 PM »
This was on the news here a month or two back
www.bbc.co.uk/news/amp/health-47238523
Came off bike onto concrete 9/9/09
LK arthroscopy 8/2/10
2nd scope on 16/12/10
RK arthroscopy on 5/2/15
Lateral meniscus trim, excision of hoffa's fat pad, chondral stabilisation
LK scope 10.1.19 medial menisectomy, trochlea microfracture, general tidy up

Offline Brandon123

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Re: Some new data on how long knee replacements last
« Reply #2 on: April 22, 2019, 02:16:30 PM »
I must admit I was (positively) surprised by the longevity of especially most TKRs.
RK sharp pain while running, diagnosis chondromalacia patellae 6/09
RK arthroscopic chondroplasty 9/09
RK rehab, recovery, 90% normal, started running again -> back to square one 5/15
RK diagnosis patellofemoral arthritis + LK diagnosis chondromalacia patellae 8/15 -> conservative treatment

Offline Vickster

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Re: Some new data on how long knee replacements last
« Reply #3 on: April 22, 2019, 03:42:52 PM »
I think itís probably very dependent on level of activity, especially with ukr/pkr. My surgeonís experience is that they loosen if very active and need revising to TKR
Came off bike onto concrete 9/9/09
LK arthroscopy 8/2/10
2nd scope on 16/12/10
RK arthroscopy on 5/2/15
Lateral meniscus trim, excision of hoffa's fat pad, chondral stabilisation
LK scope 10.1.19 medial menisectomy, trochlea microfracture, general tidy up

Offline Brandon123

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Re: Some new data on how long knee replacements last
« Reply #4 on: April 22, 2019, 04:17:02 PM »
Yup, I've heard the same thing about activity level and lifespan of replacements. If I ever get one, I will for certain try to take it reasonably easy and not abuse it :)
RK sharp pain while running, diagnosis chondromalacia patellae 6/09
RK arthroscopic chondroplasty 9/09
RK rehab, recovery, 90% normal, started running again -> back to square one 5/15
RK diagnosis patellofemoral arthritis + LK diagnosis chondromalacia patellae 8/15 -> conservative treatment

Offline Vickster

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Re: Some new data on how long knee replacements last
« Reply #5 on: April 22, 2019, 07:20:45 PM »
I don't think it even needs to be a case of 'abuse' more potentially what an active person, especially younger, might think of 'normal' function, distance cycling, walking, running around after a family, even a physical job. All reasons why surgeons and indeed health systems are unwilling to offer replacements to patients in their 30s/40s/50s until there is no alternative for a pain free functioning existence
« Last Edit: April 22, 2019, 09:16:48 PM by Vickster »
Came off bike onto concrete 9/9/09
LK arthroscopy 8/2/10
2nd scope on 16/12/10
RK arthroscopy on 5/2/15
Lateral meniscus trim, excision of hoffa's fat pad, chondral stabilisation
LK scope 10.1.19 medial menisectomy, trochlea microfracture, general tidy up

Offline GillyJay

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  • 64 year old fit female. Had PKR March 2018.
Re: Some new data on how long knee replacements last
« Reply #6 on: April 27, 2019, 12:54:24 PM »
Interesting stuff. Having had my PKR at 63, I have since cut down the amount of high impact work to try preserve the new knee and also to try to stave off the need for surgery on the other knee which isn't working currently. As I've got back to full fitness the non op knee is showing signs of degeneration/pain. Will find out exactly what is going on with that knee next week (I hope) when the OS gives me his opinion on my recent Xrays.
OA in both knees probably brought on by lifetime of various impact sports.
PKR on left knee 2018 after years of problems
March 2019 start of problems with right knee but with different symptoms.

Offline Dave33

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Re: Some new data on how long knee replacements last
« Reply #7 on: June 09, 2019, 10:45:27 PM »
Very interesting, thanks Brendan. I guess it's not really a new study, rather a meta analysis of all the studies that have been peformed historically, which is even more valuable in terms of generalization.

One thing I didn't see in first reading was any mention of improvements in design and materials, which is definitely a huge advantage to those getting their replacements recently. If a 20 year old design is working, I'd imagine even better outcomes for those with advanced polyethelene/bearing designs done more recently.

Also, I did a lot of reading before i got my PFR, and often, in a Unicomparmental, "failure" is often applied as an outcome not necessarily because the replacement has worn out, but because arthritis has spread to the other compartment(s), warranting a conversion to a total knee.

I probably do more on my PFR than most surgeons would recommend, but I'll have zero regrets if it packs it in early, and my general quality of life in the meantime is dramatically improved. I understand the opposite way of thinking, however, as my replacement is relatively bone sparing and can be redone a number of times.

« Last Edit: June 09, 2019, 10:47:17 PM by Dave33 »















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