Archive for the ‘Revision hip replacement’ Category

My 73 yo mother had an unsuccessful hip replacement which has left her with not one day free of pain. I am going to bring her to you for evaluation. What do you do if the bone chips or cracks during the operation?

Monday, February 21st, 2011

If the bone cracks during the operation, then I fix it at that time.  There are many ways to do so, and they have a wide range of applications depending on the type and location of the crack.  I always have a few backup plans on hold if this occurs.

The main issue is to recognize this potential prior to the operation, and understand that no matter how much we prepare for an operation, there will always be circumstances that we could neither prepare for nor control.

Am I a SuperPATH candidate if I have had previous hip surgery?

Friday, January 21st, 2011

Q: I had a right hip fracture repaired with screws and then the screws started coming out and would catch the tendon on the side of my leg, so the surgeon removed them. When I was finally released by the surgeon, I was told I had arthritis in that hip and I should consider a hip replacement. I am still limping around well over a year after surgery. Am I a candidate for SuperPATH hip replacement? If so, how do I begin the process of being evaluated for it?

A: Pretty much anyone who is a candidate for standard hip replacement would be a candidate for a SuperPATH procedure.  I have converted many patients from a hip fracture fixation to a total hip replacement with SuperPATH.  There are subtleties to the procedure that I may have to adjust/plan for given the increased difficulty of the case.

The evaluation process can be started by simply calling my office @ 602.553.3113 x6.  My assistant will be in touch with you regarding obtaining necessary information and pre-operative work-up.  More information can be found here, here & here.

What is the best bearing-material for my total hip replacement?

Thursday, September 2nd, 2010

This is a topic of much debate right now among surgeons. Probably the best answer is this: There is no perfect bearing surface. That is why there are so many options currently available.

I try to carefully select a bearing surface that best utilizes the potential benefits against the potential shortcomings. Here are some common hip bearing surfaces:

Ceramic-on-ceramic - This is the hardest, longest-wearing bearing available. It is been around in several iterations for at least 30 years. Major risks are that of ceramic fracture and the potential for an audible “squeaking” hip. Both of these issues have been identified, and the causes for them have largely been addressed. However, those possible problems still exist, which may warrant early bearing exchange surgery* (which is a smaller surgery in my hands). This is my bearing of choice for my young, active females. For larger men, where the potential for ceramic fracture risk may be increased, I prefer metal-on-metal.

Ceramic-on-metal – Not much is known clinically about this bearing surface yet.  Lab studies show that this may be more wear resistant than metal-on-metal.  However, the same potential risks of metal sensitivity exist.  Additionally, since this bearing doesn’t have a long clinical track record, there may be other risks that have not yet been identified.  I have used this bearing on occasion at my patients’ requests.

Metal-on-metal – extremely durable & long-lasting.  This bearing has been around & researched for at least 30 years in different iterations.

Metal-on-metal surfaces have a risk of sensitivity to the metal ions which can lead to pain & catastrophic bone loss if ignored.  This is what the unfavorable media coverage is currently focusing on.  However, the risk of this “hypersensitivity reaction” is very small.  Anyone receiving this type of bearing should be checked annually for maintenance of the joint.

This is my bearing of choice for young, active men (who do not have a history of nickel or metal allergy, and who have healthy kidneys)… accepting that there is a chance for bearing exchange surgery* if the hip presents with a metal hypersensitivity.   I believe that the potential for a durable, long-lasting bearing outweighs the remote chance of metal sensitivity.  And, even if a patient does present with metal sensitivity, the surgery to fix it is quick and easy.

Ceramic-on-plastic** – newer, very popular bearing surface.  This is a wonderful bearing surface which has a great wear-resistance.  It is less wear-resistant than ceramic-on-ceramic, ceramic-on-metal or metal-on-metal bearings.  However, it has far fewer potential risks.  Like any bearing that contains plastic, there is potential for bone loss from the plastic wear debris, which can manifest between 8-15yrs after the surgery.

Ceramic-like metal (oxidized zirconium)-on-plastic** – very similar to ceramic-on-plastic.

Metal-on-plastic** – this is the gold-standard for hip replacement.  Excellent wear rates, low risk of side-effects.  This bearing is not as wear-resistant as any of the above bearings, but appears better than the older metal-on-plastic bearings we were using 10-15 years ago.  Like any bearing that contains plastic, there is potential for bone loss from the plastic wear debris, which can manifest between 8-15yrs after the surgery.

* bearing exchange surgery – In my practice, the surgery to exchange the bearings is done through the same SuperPATH approach, and recovery is quicker than the primary surgery since no bony work is done.

** “plastic” = highly cross-linked, ultra-high molecular weight polyethylene

In total hip replacement, I have heard a larger ball (femoral head) is “better” for post-operative motion limits, etc. Can you set me straight here, please?

Thursday, September 2nd, 2010

I use a very wide variety of head sizes in my practice. There a few main issues to consider here: 1) larger head sizes can increase stability with certain approaches, 2) certain head sizes work better with certain bearing surfaces in terms of long-term wear & 3) head sizes may be limited to size of your natural “cup” (acetabulum of pelvis). In general, head sizes larger than 40mm seem to have the best wear in terms of metal-on-metal, whereas 36mm heads seem to work well with our current polyethylene. Current designs accomodate sizes from 28mm-62mm or larger, depending on patient size & the size of the appropriate implants.

The SuperPATH hip approach that I use recieves it’s stability from natural muscle preservation. It does not need implant size to help in that regard. My selection of head size is based almost entirely on your anatomy & potential wear.

How long is the recovery from your joint replacement surgeries?

Sunday, August 29th, 2010

A very general guide for all joint replacement is:
- You will continue to improve for an entire year, even if you feel 100% within weeks after surgery.

The following is highly variable, and represents a reasonable baseline.  The recovery can be longer depending on the severity of the disease.  Most of my patients stop their pain medication on the following schedules:
- Total hips in 1-3 weeks
- Partial knees in 1-4 weeks
- Total knees in 2-10 weeks
- Revision hip or knee replacement, too variable to comment

I usually recommend that my patients take 2 months off of work for any joint replacement.  That way, you can always go back to work sooner if you feel like it.  Most of my patients return to work within a few weeks.

How long does a total -vs- partial -vs- revision joint replacement last?

Sunday, August 29th, 2010

Regarding implant longevity, the short answer is: we don’t know.

The point that I need to emphasize is that longevity of an implant is HIGHLY VARIABLE.  It really depends on multiple factors.  No patient is the same, activity levels vary, accidents can happen, and the modes of failure are numerous and unpredictable. 

For total joint replacement, 10-15 years is an often quoted average.  Individually, joint replacements can last as long as only a few weeks to 40+ years.

Revision joint replacements may also last as long, but depending on how extensive the revision is, this can also vary widely, and is less predictable than the original (known as a “primary”) joint replacement.  Additionally, your joint’s function can decrease with every surgery that is done to it, mostly because of scar tissue formation.  This also varies widely.

Partial knee replacements can have the same longevity, but they have a higher rate of revision than total knee replacements at 10 years by most studies. 

Advantages of partial knee replacements are that they are easier & quicker to recover from, they feel more natural, and if/when they need to be revised, chances are high that the revision will recover and act more like a primary knee replacement rather than a revision knee replacement at that time.  Even though a partial knee replacement may be the only surgery you need during your entire lifeitme, one way to view a partial knee replacement is that it may be a way to postpone getting a total knee replacement.  To use dental terms: a partial knee is a “filling”, a total knee is a “crown”.

What is a “revision” total joint?

Sunday, August 29th, 2010
Q:  If realistically a total joint replacement can fail over time, what about “do-overs”?  Are they possible, and can they be effectively performed?
A:  “Do-overs” (commonly referred to as “revisions”) are becoming more routine.  Technology, techniques & knowledge are advancing quickly in this realm.  For all of my patients receiving a joint replacement earlier than 75 years of age, I try to prepare them for the possibility of 1 or more revisions during their lifetime.  More information can be found on my website at http://chowhipandknee.com/revision-surgery.html