AMIS Patient Education Brochure

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Strive to improve your quality of life with

AMIS

STRIVE TO IMPROVE YOUR QUALITY OF LIFE WITH AMIS

All trademarks and registered trademarks are the property of their respective owners

The AMIS (Anterior Minimally Invasive Surgery) approach is a true intermuscular

and internervous minimally invasive surgical technique.

In fact the anterior approach is the only technique which follows intermuscular

and internervous planes to reduce the risk of injury to muscles, tendons, vessels

and nerves.[13]

AMIS is a surgical technique that is intended to improve the quality of your life and

help to hasten your recovery after a Total Hip Replacement (THR).

AMIS can potentially provide you with the following benefits over the conventional

surgical approach:

 No muscles cut

 Decreased post-operative pain [1,3]

 Shorter rehabilitation [3,4]

 Shorter hospital stay [2,12]

 Smaller skin scar [3]

 Faster return to daily activities [2,10,11]

 Reduced blood loss [3,12]

 Reduced risk of dislocation [4,5]

 Reduced risk of limping [ 6 , 7, 8 ,9 ]

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This brochure has been produced to help you to feel comfortable and safe about

your operation. It addresses questions you may have about the surgery and post-

operative recovery.

STRIVE TO IMPROVE YOUR QUALITY OF LIFE WITH AMIS

Introduction

 1 The hip and osteoarthritis

Discover how your hip works and what is osteoarthritis

 2 Total Hip Replacement

Learn about the artificial hip and its benefits

 3 AMIS and “conventional” approaches

Learn about hip surgical procedures

 4 Why an AMIS Total Hip Replacement?

The benefits of the AMIS technique

 5 Getting ready for your operation

Things to do to prepare for your operation

 6 In the hospital

Your stay in hospital until discharged

 7 Taking care of your new hip

Things to do to protect your new hip

CONTENTS

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6

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patient information

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Intended to

help improve

the quality of

your life

STRIVE TO IMPROVE YOUR QUALITY OF LIFE WITH AMIS

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STRIVE TO IMPROVE YOUR QUALITY OF LIFE WITH AMIS

INTRODUCTION

The hip joint is the articulation area between the pelvis and the leg to support the weight

of the body posture. As we use our hips for walking, rotating and flexing the leg, they

are subjected to loads during almost all movements. Therefore, it is not surprising that

the hip joint is liable to injury or development of degenerative joint diseases, such as

osteoarthritis.

One of the consequences of any joint disease is pain.

Hip pain limits your daily activities, affects your mood, your health and, definitely, your

general wellbeing.

Do you want to get rid of the pain?

Hip replacement may help.

There are a number of solutions, surgical and non-surgical, to treat your disease. Ask your

doctor what is the most suitable treatment for your age, activity level and expectations.

In the case of advanced osteoarthritis, hip pain and stiffness severely limit your life and

your doctor may suggest that you undergo a total hip replacement.

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patient information

1 - THE HIP AND OSTEOARTHRITIS

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1 - THE HIP AND OSTEOARTHRITIS

patient information

OSTEOARTHRITIS OF THE HIP

The main cause of hip joint diseases is the wear of the articular cartilage: osteoarthritis. This wear is

perceived as pain, initially only when a load is bearing on the joint, then more and more frequently,

and finally also at rest.

Wear of hip

cartilage

Severe

osteoarthritis

Normal hip

cartilage

Femoral head

(hip ball)

Acetabulum

(hip socket)

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ANATOMY OF THE HIP JOINT

The hip joint is formed by the articulation of the rounded head of the femur and the cup-like acetabulum

of the pelvis. It forms the primary connection between the bones of the lower limb and the axial skeleton

of the trunk and pelvis.

The surface of the femoral

head and the acetabulum,

where the bones come into

contact, is coated with a

smooth tissue called articu-

lar cartilage.

The cartilage, together

with a substance called

synovial fluid, prevents

the bones from rubbing

against each other and

from becoming damaged.

The increase in intensity

of the pain is a slow pro-

cess, sometimes over many

years, and can lead to a

stiff hip joint.

Hip replacement is a com-

mon treatment for severe

osteoarthritis.

Successful hip replacement

brings dramatic pain relief

and improvement in the

function of the hip joint.

2 - TOTAL HIP REPLACEMENT

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WHAT IS TOTAL HIP REPLACEMENT?

Total hip replacement surgery substitutes the damaged

bone and cartilage of the joint with polyethylene (a

plastic material) or ceramic and metallic components.

A hip prosthesis is an artificial articulation composed of

a femoral stem with a head (sphere) and a

socket cup (acetabular shell and liner, if any).

The femoral stem is made of metal (usually a Titanium alloy or

stainless steel). The head is made of ceramic or metal. The

cup is made of 1 or 2 pieces, depending on the procedure:

cemented (usually only one component of polyethylene)

or cementless (metallic acetabular shell and liner). In the

case of a metallic acetabular shell a polyethylene liner

articulates against the head. All the materials used for hip

arthroplasty are highly biocompatible.

WHY TOTAL HIP REPLACEMENT?

With almost 70 years of history, total hip replacement

surgery is a very common and safe procedure for the

treatment of severe arthritis.

The main benefits of a successful total hip replacement

are:

1 Reduction in hip pain

The pain will be rapidly and dramatically reduced and

usually eliminated.

2 Recovery of mobility

Your hip will function with less effort, almost regaining

its original mobility.

3 Improvement in quality of life

Your everyday activities and your social life will no

longer be limited by pain and reduced mobility.

CUP

Metal - Cementless

LINER

Polyethylene

HEAD

Ceramic or metal

2 - TOTAL HIP REPLACEMENT

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patient information

FEMORAL STEM

Metal - Cementless or cemented

3 - AMIS AND CONVENTIONAL APPROACHES

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3 - AMIS AND CONVENTIONAL APPROACHES

patient information

WHAT IS MINIMALLY INVASIVE SURGERY?

The surgeon can access the hip joint by different paths, following a “conventional” surgical

approach or a Minimally Invasive Surgical approach (MIS).

True Minimally Invasive Surgery is characterized by the preservation of muscles and

tendons encountered during the surgery to the hip joint capsule and offers a reduced

skin incision.

AMIS is true Minimally Invasive Surgery.

Other approaches advertised as minimally invasive (posterior, lateral or double incision)

are only reduced skin incision techniques and are associated with the same muscle and/

or tendon injury as “conventional” approaches.[13]

In fact the anterior approach is the only technique which follows inter-muscular and inter-

nervous planes to reduce the risk of injury to muscles, tendons, vessels and nerves. Possible

muscular release is reduced to a minimum and in all cases is less significant than with other

surgical approaches.[13]

For this reason AMIS is the ideal approach for atraumatic surgery which is fundamental for a

fast recovery: AMIS is intended to improve the quality of your life and help to hasten your

recovery after a Total Hip Replacement.

The AMIS technique has decreased the incidence of complications when compared to

“conventional” techniques. Your doctor will assist in providing more details.[14]

AMIS does not cut muscles and does respect nerves.

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4 - WHY AN AMIS TOTAL HIP REPLACEMENT?

The AMIS technique causes less surgical trauma than other techniques because

no muscles are cut, which aids in rapid recovery.

AMIS CAN POTENTIALLY PROVIDE YOU WITH THE FOLLOWING BENEFITS

1 Decreased post-operative pain

In comparison with “conventional” surgical techniques, the AMIS approach can reduce the post-

operative pain as muscles are not cut.

2 Shorter rehabilitation

Rehabilitation can usually start the day of the operation or the day after, subject to your doctor’s approval,

based on your post-operative conditions. Standing up and walking with arm crutches can start immediately,

with your doctor’s authorisation.

3 Shorter hospital stay

The AMIS technique usually significantly reduces the duration of hospital stay. Your surgeon may still recommend

a longer stay, depending on your post-operative condition.

4 Smaller skin scar

With AMIS, the skin incision is often shorter than with “conventional” surgery and therefore scar tissue is reduced.

5 Faster return to daily activities

The AMIS technique allows you to return to daily activities in a shorter time frame.

6 Less blood loss

Preservation of muscles and vessels potentially reduces blood loss. Transfusions are rare and blood clots

in the legs (deep venous thromboses) are less likely.

7 Reduced risk of dislocation

As a result of the AMIS technique the preservation of muscles significantly improves the stability of the

hip. The risk of dislocation is minimal and the post-operative limitation of movements, usually prescribed

in other techniques, is not necessary. The risk of dislocation is reduced because the anterior approach is

performed from the front of your body and dislocation is mainly related to posterior hip structure damage.

8 Reduced risk of limping

AMIS is characterised by a surgical technique that protects the various muscles, blood vessels and nerves encoun-

tered during exposure of the hip joint. Minimizing muscle and nerve damage reduces the chances of limping.

You may drive when able to get in and out of the car comfortably, have excellent control of your legs and

are not taking pain medications.

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4 - WHY AN AMIS TOTAL HIP REPLACEMENT?

patient information

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The primary goal of AMIS Total Hip Replacement is to minimize harm to muscles, blood

vessels and nerves surrounding the joint. The AMIS technique is the specifically

designed method to achieve this goals.

GOAL OF AMIS

5 - GETTING READY FOR YOUR OPERATION

Before undergoing your total hip replacement, your doctor will prescribe a com-

plete physical examination to assess your condition and to ensure that there are

no factors that could interfere with your surgery.

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TESTS & CHECKS

5 - GETTING READY FOR YOUR OPERATION

patient information

SPECIAL EQUIPMENT

After the intervention special equipment, such as support stockings and crutches, may

be needed: you can rent or buy them from specialized shops. Check with your physio-

therapist.

MEDICATIONS

Prior to surgery, provide your surgeon with a complete list of the medications you

are taking including doses and times. He or she will inform you if you need to

stop or change any medication.

CHECK YOURSELF

1 Check your skin

If your hip and leg have any skin infections or irritation, contact your orthopaedic

surgeon prior to surgery: he or she will tell you how best to prepare your skin for

surgery.

2 Check your teeth

The incidence of infection after hip replacement is very low, but even an infection

far from the hip joint can spread through the bloodstream to the new hip. Prevention

is the best way to avoid early problems. Therefore, you should contact your dentist

to have your teeth checked before your total hip replacement surgery.

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TESTS

Your doctor may ask you for blood and urine tests and possibly a cardiogram, prior

to your surgery.

6 - IN THE HOSPITAL

1 A complete list of your routine medications including doses and times; your x-rays

2 All papers for hospital admission including a copy of insurance cards (if requested in your country)

3 Any equipment (crutches, stockings, etc.) ordered for you by your doctor

TAKE WITH YOU

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6 - IN THE HOSPITAL

patient information

THE DAY OF YOUR OPERATION

The surgical procedure will take about 1 to 2 hours.

It will be preceded by pre-surgical preparation and followed by monitoring in the recovery

room.

The time away from your room will be longer than the operation due to time needed for

your preparation for surgery, administration of anaesthesia and monitoring as you recover

from the anaesthetic. Special care is taken to relieve pain after the surgery. Do not hesitate

to call, even in the middle of the night, to obtain relief. Regular checks will be made by

the nurses.

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AFTER THE OPERATION

Specialized personnel will, from day one after the surgery, take care of your recovery

by defining the most suitable rehabilitation program for you and accompanying you

through the gradual recovery process.

Rehabilitation can be started the day of the operation, subject to your doctor’s approval.

You may progress to weight bearing activities as tolerated and may discontinue assistive

devices as your comfort level improves. Although patients may be quite variable, most

discontinue assistive devices within two weeks post-operatively.

7 - TAKING CARE OF YOUR NEW HIP

1 Lead a healthy and active life

2 In case of fever, throat inflammation or any

infection, tell your doctor that you have a hip

implant

3 Undergo regular general check-ups

References:

[1] Arthroplastie totale de hanche par voie antérieure et son évolution mini-invasive; F. Laude et al.;

EMC; 2004, 44-667-B

[2] Single-incision anterior approach for total hip arthroplasty on an orthopaedic table; JM Matta et

al; Clin Orthop Relat Res, 2005 Dec, (441): 115-24

[3] Minimally Invasive total hip arthroplasty: anterior approach; F. Rachbauer; Orthopäde, 2006

Jul;35(7):723-4, 726-9

[4] Mini-incision anterior approach does not increase dislocation rate: a study of 1037 total hip

Replacement; T Siguier et al; Clin Orthop Relat Res, 2004 Sep, (426): 164-73

[5] What‘s new in hip arthroplasty; MH Huo et al; JBJS Am; 2005 Sep, 87(9):2133-46

[6] Rapid Rehabilitation and recovery with minimally invasive total hip arthroplasty; RA Berger et al;

Clin Orthop Relat Res, 2004, (429): 239-247

[7] The minimally invasive anterior approach to hip arthroplasty; RE Kennon et al; Orthopäde, 2006

Jul, 35 (7): 731-7

DON’T FORGET

LONG TERM CARE OF YOUR TOTAL HIP

Follow your orthopaedic surgeon’s instructions carefully to minimize any potential

complications which can affect your recovery and your implant lifetime. These

complications, however, are quite infrequent and some simple rules can dramatically

reduce their likelihood.

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7 - TAKING CARE OF YOUR NEW HIP

[8] Dislocation after hip hemiarthroplasty: anterior versus posterior capsular approach.; JB Bush et al;

Orthopedics. 2007 Feb;30(2):138-44

[9] Muscular damage after total hip arthroplasty: conventional versus minimally invasive anterior ap-

proach.; Dr Dora, Dr Kalberer; AOA 2008, Australia, Hobart

[10] Abductor Tendons and Muscles Assessed at MR Imaging after Total Hip Arthroplasty in Asymptom-

atic and Symptomatic Patients. C. Pfirmann et al., Radiology 2005, 235: 969-976.

[11] MR imaging of the abductor tendons and muscles after total hip replacement in asymptomatic and

symptomatic patients. PD Dr. Dora, EFORT 2007

[12] Der anteriore Zugang für die minimal-invasive HTEP. C Dora; Leading Opinions Sept 2006,

1/2006

[13] Single-Incision Direct Anterior Approach for Total Hip Arthroplasty Using a Standard Operating

Table; TP Lowell; The Journal of Arthroplasty Vol. 23 No. 7 Suppl. 1 2008

[14] The minimally invasive anterior approach to hip arthroplasty; RE Kennon et al; Orthopäde, 2006

Jul, 35 (7): 731-7

patient information

If you have any concerns about your new hip don’t hesitate to contact your doctor

and, finally...

...enjoy your new hip!

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“It was very satisfying to walk unaided just one week

after the operation with no pain or discomfort.”

D. A., age 67, patient

“It went so well that you get the feeling that all really

was possible in one day after such a hip replacement

operation. I was on top of the world.”

M. J., age 67, patient

For further information visit the website:

www.mynewamiship.com

AMIS Patient Information

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rev. 03

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