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Fourteen year follow-up of
Birmingham Hip Resurfacing
in patients under the age of 50
C. W. McBryde, R. B. C. Treacy, W. B. Pynsent & P. B. Pynsent
Research & Teaching Centre,
Royal Orthopaedic Hospital,
Birmingham, U.K
Survival of hip replacement in the under 50
Oct 2011 - 3668 THRs under age 55
15 year survival 62% uncemented and 58% cemented
Finish arthroplasty register
The Case Series
Single surgeon consecutive all-
inclusive series (RBCT)
All NHS (public) patients
Data collected prospectively and
supplemented retrospectively
Demographics
447 BHRs in 393 patients
August 1997 to April 2006
267 (60%) male and 180 (40%) female
Mean age 41.1 years (range 15-49)
Median follow up 8.0 yrs (range 5.0-
14.0)
Indications for primary surgery
Surgery
All performed by RBCT
Laminar air flow theatre
Posterior approach with release of glut. max.
Posterior capsulectomy and anterior
capsulotomy
Head prepared with standard instrumentation
Low viscosity cemented femur, uncemented
acetabulum
Revisions, Oxford hip score, Radiology.
4 tranches of targeted mail shots to addresses
from the ROH and Oswestry databases
Personal home visit and telephone calls
Patient tracking via independent private
agency
Very time consuming and expensive
Methods
Time to find patients from 1st April 2009
Time (months)
Numberofpatients
Estimated 10 year survival assuming all
lost to follow-up have failed
Survival at 10 years
Cumulativeproportionsurviving
As of December 2011
- none lost to follow-up
Cumulativeproportionsurviving
Time (years)
Survival 89.2% at 14 years
Survival 95.1% at 10 years
KM survival of 447 BHRs
in patients under the age of 50
Revision Sex Age Diagnosis Head size Time (years)
Reason for
revision
1 f 49 OA 46 0.5 Loose-acet
2 m 44 OA 54 0.5 Infection
3 f 49 OA 42 0.7 #NOF
4 f 49 OA 46 1.8 NA
5 f 48 OA 46 2.2 Infection
6 f 43 OA 42 5.3 Infection
7 m 42 AVN 50 5.9 Loose-fem
8 f 26 DDH 42 6.3 Loose-fem
9 f 42 OA 42 6.7 Loose-fem
10 m 30 RA 46 7.1 NA
11 f 17 Inflam 42 9.4 Loose-fem
12 m 30 AVN 50 9.5 Loose-fem
13 f 17 AVN 42 9.9 AVN
14 f 49 OA 50 10.2 Pain
15 f 36 OA 46 10.8
Implant
fracture
16 m 43 Perthe’s 50 11.8 Loose-fem
Cumulativeproportionsurviving
Time (years)
Aseptic femoral loosening
Cumulativeproportionsurviving
Time (years)
Infection
#Nof
Pain
AVN
KM survival of 195 BHRs in male patients with OA
under the age of 50 (aseptic revisions)
Cumulativeproportionsurviving
Time (years)
Survival 100% at 14 years
Male, OA under 50 years
KM survival of 105 BHRs in female patients with OA
under the age of 50 (aseptic revisions)
Cumulativeproportionsurviving
Time (years)
Survival 95.9% at 10 years
Survival 87.2% at 14 years
Female, OA under 50 years
Cumulativeproportionsurviving
Time (years)
Male 10 year survival - 100% (100-100)
Female 10 year survival - 95.9% (90.2-99.9)
Cox-prop hazard - p = 0.024
Head size highly significant - small worse
Cox-prop hazard - p = 0.004
7 deaths during follow-up - all unrelated
Results
Oxford hip score -standards developed from 6,602
Time (years)
Score(%)
95%
75%
50%
25%
5%
Oxford hip scores for under 50 group
Time (years)
Score(%)
711/1394 (51%) post -op scores
below median standard
Oxford hip score
Time (years)
Score(%)
Flooring effect.
Do we need a different scoring system?
No comparative group
Radiographic analysis available on 44%
Metal ions not available
Designer surgeon series
Limitations of this case series
JBJS Br March 2012 - Melbourne group
230 BHRs mean fu 10 years
94.5% overall, male 97.5%, female 89.1%
7% lost to follow-up
Women/ small size - is it still acceptable to
resurface women?
BHR results from independent centre
No aseptic failure in male patient with OA (195
cases 100% survival at 14 years)
Higher revision rate in women - but still
acceptable, within NICE guidelines
Small sizes (<46) and other diagnoses
(abnormal anatomy) be cautious
Conclusions
Birmingham Hip resurfacing provides excellent
results in previously difficult to treat group
Reactions to metal debris are rare
Bad designs and poor surgery have tarnished
an otherwise great advance in hip surgery
Conclusions

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Birmingham Hip Replacement - Under 50

  • 1. Fourteen year follow-up of Birmingham Hip Resurfacing in patients under the age of 50 C. W. McBryde, R. B. C. Treacy, W. B. Pynsent & P. B. Pynsent Research & Teaching Centre, Royal Orthopaedic Hospital, Birmingham, U.K
  • 2. Survival of hip replacement in the under 50
  • 3. Oct 2011 - 3668 THRs under age 55 15 year survival 62% uncemented and 58% cemented Finish arthroplasty register
  • 4. The Case Series Single surgeon consecutive all- inclusive series (RBCT) All NHS (public) patients Data collected prospectively and supplemented retrospectively
  • 5. Demographics 447 BHRs in 393 patients August 1997 to April 2006 267 (60%) male and 180 (40%) female Mean age 41.1 years (range 15-49) Median follow up 8.0 yrs (range 5.0- 14.0)
  • 7. Surgery All performed by RBCT Laminar air flow theatre Posterior approach with release of glut. max. Posterior capsulectomy and anterior capsulotomy Head prepared with standard instrumentation Low viscosity cemented femur, uncemented acetabulum
  • 8. Revisions, Oxford hip score, Radiology. 4 tranches of targeted mail shots to addresses from the ROH and Oswestry databases Personal home visit and telephone calls Patient tracking via independent private agency Very time consuming and expensive Methods
  • 9. Time to find patients from 1st April 2009 Time (months) Numberofpatients
  • 10. Estimated 10 year survival assuming all lost to follow-up have failed Survival at 10 years Cumulativeproportionsurviving As of December 2011 - none lost to follow-up
  • 11. Cumulativeproportionsurviving Time (years) Survival 89.2% at 14 years Survival 95.1% at 10 years KM survival of 447 BHRs in patients under the age of 50
  • 12. Revision Sex Age Diagnosis Head size Time (years) Reason for revision 1 f 49 OA 46 0.5 Loose-acet 2 m 44 OA 54 0.5 Infection 3 f 49 OA 42 0.7 #NOF 4 f 49 OA 46 1.8 NA 5 f 48 OA 46 2.2 Infection 6 f 43 OA 42 5.3 Infection 7 m 42 AVN 50 5.9 Loose-fem 8 f 26 DDH 42 6.3 Loose-fem 9 f 42 OA 42 6.7 Loose-fem 10 m 30 RA 46 7.1 NA 11 f 17 Inflam 42 9.4 Loose-fem 12 m 30 AVN 50 9.5 Loose-fem 13 f 17 AVN 42 9.9 AVN 14 f 49 OA 50 10.2 Pain 15 f 36 OA 46 10.8 Implant fracture 16 m 43 Perthe’s 50 11.8 Loose-fem
  • 15. KM survival of 195 BHRs in male patients with OA under the age of 50 (aseptic revisions) Cumulativeproportionsurviving Time (years) Survival 100% at 14 years Male, OA under 50 years
  • 16. KM survival of 105 BHRs in female patients with OA under the age of 50 (aseptic revisions) Cumulativeproportionsurviving Time (years) Survival 95.9% at 10 years Survival 87.2% at 14 years Female, OA under 50 years
  • 18. Male 10 year survival - 100% (100-100) Female 10 year survival - 95.9% (90.2-99.9) Cox-prop hazard - p = 0.024 Head size highly significant - small worse Cox-prop hazard - p = 0.004 7 deaths during follow-up - all unrelated Results
  • 19. Oxford hip score -standards developed from 6,602 Time (years) Score(%) 95% 75% 50% 25% 5%
  • 20. Oxford hip scores for under 50 group Time (years) Score(%) 711/1394 (51%) post -op scores below median standard
  • 21. Oxford hip score Time (years) Score(%) Flooring effect. Do we need a different scoring system?
  • 22. No comparative group Radiographic analysis available on 44% Metal ions not available Designer surgeon series Limitations of this case series
  • 23. JBJS Br March 2012 - Melbourne group 230 BHRs mean fu 10 years 94.5% overall, male 97.5%, female 89.1% 7% lost to follow-up Women/ small size - is it still acceptable to resurface women? BHR results from independent centre
  • 24. No aseptic failure in male patient with OA (195 cases 100% survival at 14 years) Higher revision rate in women - but still acceptable, within NICE guidelines Small sizes (<46) and other diagnoses (abnormal anatomy) be cautious Conclusions
  • 25. Birmingham Hip resurfacing provides excellent results in previously difficult to treat group Reactions to metal debris are rare Bad designs and poor surgery have tarnished an otherwise great advance in hip surgery Conclusions