Erratum to: Clin Orthop Relat Res DOI 10.1007/s11999-012-2407-3

In the third sentence of the Patients and Methods section it states, “We considered patients with primary osteoarthritis of the knee and a mechanical axis between 20° and 5° valgus”. However, the sentence should state, “We considered patients with primary osteoarthritis of the knee and a mechanical axis between 20° varus and 5° valgus”.

In addition, Dr. Yim’s degree is MD rather than MD, PhD. He currently is studying for his PhD degree.