unicompartmental knee arthroplasty: indications and current results natasha holder md, msc pgy-1
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Unicompartmental Knee Arthroplasty: Indications and
Current ResultsNatasha Holder MD, MSc
PGY-1
Objectives
Classic indications
Expanding indications
UKR vs. TKR: current outcome studies
Unicompartmental Knee Arthroplasty
Preservation of normal kinematics
Lower perioperative morbidity
Accelerated patient rehabilitation
Preservation of bone stock
Classic Indications
Diagnosis of unicompartmental arthritis
Age >60 with low demand for activity
Weight <82 kg
ROM arc >90° with <5° flexion contracture
Angular deformity of <15°Kozinn et al. JBJS 1989:145-150
Contraindications
Inflammatory arthritis
Patient age < 60
High patient activity level
Patellofemoral pain
Kozinn et al. JBJS 1989:145-150
UKA and Age
Pennington et al. (JBJS, 2003) Retrospective study, 46 UKA, age <60 Survivorship of 92% at 11 years
Price et al. (JBJS (Br), 2005) Case Series, 564 UKA, compared 2 age groups Age <60 – Survivorship of 91% at 10 years Age >60 Survivorship of 96% at 10 years
Cartier et al. (Ortho, 2007) Case Series, 161 UKA, age <60 Survivorship of 94% at 10 years, 88% at 12 years
UKA and Age
Kort et al. (Knee, 2007) Case Series, 46 UKA, age <60, 2-6 yr F/U Improved KSS and WOMAC scores Obesity can affect outcome i.e. technical failure
Berend et al. (Orthopedics, 2007) Case Series, 318 UKA, age 33-90, 6w-28 mo F/U Early survivorship 98.1%, age <60 was not
predictive of early failure
UKA and Obesity
Berend et al. (Orthopedics, 2007)Prospective study, 318 UKA, weight 51-
158kg, 150 UKA BMI >32, 6w-28 mo F/U
Early surviorship 98.1%, weight >82 or BMI >35 was not predictive of early failure
UKA and ACL Deficiency
Pandit et al. (JBJS (Br), 2006)Prospective Study, compared 15 UKA
with ACL reconstruction to 15 UKA with intact ACL (age, gender, F/U matched)
Oxford Knee score, KSS, Tegner activity level score, radiological assessment
UKA and ACL Deficiency
Pandit et al. (JBJS (Br), 2006)ACLR had greater postoperative
Oxford knee scores than ACLI No pathological radiolucencies or
component subsidence in either group
UKA vs TKA
Lombardi et al. (Clin Ortho Relat Res, 2009) Retrospective cohort, 115 UKA and 115 TKA,
matched for age, gender, BMI, bilaterality UKA selection: anteromedial OA, intact ACL,
flexion deformity <15°, varus deformity <15° TKA selection: unicompartmental OA or more
extensive OA Outcomes: ROM, KSS, LOS
UKA vs TKA
Newman et al. (JBJS (Br), 2009 Prospective randomized control trial (1989-1992)
with a 15 year follow up 102 knees Criteria: unicompartmental, intact cruciate
ligaments, flexion deformity ≤ 15°, varus/valgus deformity ≤15°
Outcome: Bristol knee score Failure: revision, Bristol score < 60
UKA 89.8% Survival rate
TKA 78.7% Survival rate
UKA results are comparable to TKA and have no greater tendency to fail at 15 years
Summary
In appropriately selected patients UKA is a successful procedure Indications are expanding with
satisfactory resultsEqual survivorship to TKA in first decade Improved functional resultsFewer complications
Thank you
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