Objectives: Practical, applicable, valid, and reliable tools are needed to assess physical performance in patients with Total Knee Arthroplasty(TKA) in a variety of settings, including routine clinical assessment, research studies, and community-based programs. Therefore, the aim of this study is to evaluate the validity and reliability of the Short Physical Performance Battery (SPPB) among patients with TKA.

Methods: We included patients who underwent TKA surgery. The SPPB, Timed up and go(TUG) test and, Hospital for Special Surgery (HSS) Knee Score were administered to the patients. SPPB was performed twice on the same day with 1 h rest.

Inclusion Criteria:

• patients who had primary TKA surgery at six months ago, were diagnosed with preoperative knee OA, and were willing to participate in the research

Exclusion Criteria:

• a previous orthopedic, neurological, or systemic disease that effected walking or standing, body mass index of 40 kg / m2 and over and having any other surgery on the same limb that effected walking.