Miller/Galante
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Transcript Miller/Galante
UNICOMPARTMENTAL KNEE
ARTHROPLASTY
MINIMALLY INVASIVE TECHNIQUE
Frank R. Ebert, MD
Assistant Chief
Department of Orthopædics
The Union Memorial Hospital
Baltimore, Maryland
History
Unicompartmental knee arthroplasties
have been in use since the early 1970’s.
UKA quickly gained popularity, but
soon got a bad reputation, especially in
the USA.
UKA Failures
Improper
Poor
indications
surgical technique (no guides)
Inferior
prosthetic designs in some
cases (e.g. PCA)
UKA Failures cont’d.
Improper Indication
Inflammatory Arthritis
Obesity
Severe Deformity (> 10° Varus/>15° Valgus)
Active Young Patient
UKA Failures cont’d.
Surgical Technique
Overcorrection
Undercorrection
Patellar Impingement on Femur
Component Malposition
UKA Failures cont’d.
Prosthetic Design
6-mm Polyethylene
Cementless Fixation
UKA results
Some prostheses like the Marmor, St
George Sledge, and the M.G. have
proven good long term results
UKA Results
Swedish Registry 1975 to 1991
93% Survivorship over 16 years
UKA Results
Swedish Registry 1975-1991
90% Plus Survivorship – Surgeons doing 15 or
more per year.
70% to 80% Survivorship – Surgeons doing
less than 15 per year.
Lesson: DO IT RIGHT!
(Technique and Patient Selection)
Advantages UKA
Less invasive surgery
Shorter hospital stay
Better ROM than TKA
More ”normal knee”
Easier revision
”Miniarthrotomy”
John A Repicci
Buffalo USA
Minimally invasive surgery
”Miniarthrotomy”
Early
mobilisation
No Transfusion
Short hospital stay
Low Morbidity
Quick rehabilitation
Concerns Repicci II
Demanding
surgical technique
No guides - ”free hand surgery”
Thin tibial component (6 - 7 mm)
Limited Sizes
Long term results?
Why Miller - Galante uni?
Proven good / excellent long term
clinical results
Excellent results (Nilsson & Dahlen, Hyldahl
al.)
Adequate alignment and resection guides reproducible surgical technique –
no ”free hand surgery”
MG-UNI
98% 10 yr. Survival (loosening or
revision endpoint.)
98% Good or Excellent Results
-Berger, et al. CORR, 1999
Clinical Results – HSS Scores
n=150
n=147
96
n=51
92
59
58
55
Preop
Postop
Berger RA, et al. Clin Orthop Rel Res. 1999;367:50-60.
Argenson JN, et al. 2001 AAOS presentation.
Swienckowski, J. 2001 Poster Osteopathic Specialists Meeting
95
Clinical Results – HSS Scores
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
Excellent
Good
Fair
Berger RA, et al. Clin Orthop Rel Res. 1999;367:50-60.
Swienckowski, J. 2001 Poster Osteopathic Specialists Meeting
Clinical Results – Survivorship
10-year
100%
90%
98%
80%
96%
95%
Argenson
Swienckowski
70%
60%
50%
40%
30%
20%
10%
Berger
n=62
n=160
n=187
Clinical Results – Range of
Motion
160
150
140
130
120
128º
110
100
120º
90
Berger
n=51
Argenson
n=147
Randomised study comparing
metal backed and all poly tibia
Hyldahl, Regner, Carlsson, Kärrholm & Weidenhielm 1999
No difference in clinical results
Metal backed or all poly tibia?
Indications
Medial
OA grade I-III (Ahlbäck) no inflammatory joint disease
Mild To Moderate Deformity
Intact ACL (?)
Minimal Patellofemoral Symptoms
Age 55 yrs. (?)
Perioperative
Short
1
spinal with/without duramorph.
gms.Ceflosporin I.V. prior to
tourniquet inflation.
Postoperative
Compression dressing 24 h
Full weight-bearing 4 - 6 h postop
Free flexion / extension
Oral pain killers
DVT prophylaxis for 1 month
SURGICAL
TECHNIQUE
Miniarthrotomy
Flexed knee
Leg stabilizer
0°-120°
“Miniarthrotomy”
Incision 8-10 cm,
medial to patellar
tendon
Miniarthrotomy
Arthrotomy 8-10 cm
T-incision distal to
vastus medialis
Release 2 cm below
joint line
Femoral drilling i.m.
IM guide femur
Distal femoral cut
Distal femoral cut finished
Femur chamfer cuts
Drilling peg holes
Femur - posterior cut
Tibial resection
Tibial resection horizontal cut
Tibial resection sagittal cut
Resection posterior corner femur
Tibial sizing
Tibia - peg holes
Trial reduction, flexion
Trial reduction, extension
Cementation
Closure
THANK YOU
UNION MEMORIAL HOSPITAL
BALTIMORE, MARYLAND
Migration PFC, Sledge
& MG uni
(tibial component)
Nilsson and Dahlen 1997
mm2,5
2
PFC
Sledge
MG uni
1,5
1
0,5
0
0
3
6
12
months