Indications for UKA for isolated osteoarthritis of the knee remain controversial. 229 UKA that were performed at our institution were evaluated for which factors was associated with a poor outcome. BMI > 35 was correlated with lower KSS scores than patients with BMI < 35. In contrast to prior reports, patients younger than 60 years old had higher scores than patients 60 years and older at 2 years. Women had an unacceptably high short-term revision rate for any reason of 6.5%. Popularity for UKA has increased, and a more in depth investigation of predictors of poor outcomes demonstrates that younger patients appear to have better results. Obese patients continue to improve up to 2 years after surgery and should not be precluded from undergoing UKA.

Introduction: Ranked as the second most common cause of long-term disability amongst American adults, osteoarthritis (OA) affects well over 60 million Americans per year. OA is one of the major contributors to health care-related economic cost in the US, which is generally considered unacceptably high when compared other Western industrialized nations.

Methods: Three hundred and thirty-five patients undergoing primary unilateral or bilateral total hip arthroplasty (THA), metal-on-metal hip resurfacing (MOMHR), total knee arthroplasty (TKA), or unicondylar knee arthroplasty (UKA) were offered voluntary participation in an one-on-one preoperative education session with a pre-operative educator. Length of stay (LOS) and in-patient costs was collected for patients who received individual pre-operative education. This was then compared to patients who chose not to participate in the education sessions using linear regression models.

Results: Patients who chose to participate enjoyed a significantly shorter LOS than those who did not receive education, controlling for age, sex, type of procedure, and number of co-morbid conditions (3.1 ± 1.1 vs. 4.5 ± 4.7; p< 0.01). THA patients participating in the preoperative education program exhibited a calculated cost savings of $861 per case over non-educated patients (p=0.06), while TKA patients participating in the program exhibited a statistically significant savings of $1,144 per case (p=0.02). This translated into a cost savings of $84,351 for 93 THA patients and $93,493 for 74 TKA patients at our institution, accounting for the cost of the patient educator. Of higher significant impact on cost savings was the number of co-morbid conditions for both THA (p=0.01) and TKA (p=0.01) patients. If applied in the national setting, national cost savings projections for a mean 0.84 day reduction in LOS for educated THA patients estimated a savings of nearly $800 million; a mean 0.56 day reduction for preoperatively educated TKA translated into a projected savings of $1.1 billion on the national scale.

Conclusion: Preoperative education in the setting of hip and knee arthroplasty is an important cost-savings tool for hospitals, Medicare and third party payers in this era of rising health care costs.