Medial Unicompartmental Arthroplasty of the Knee

Jason M. Jennings, MD, DPT; Lindsay T. Kleeman-Forsthuber, MD; Michael P. Bolognesi, MD


J Am Acad Orthop Surg. 2019;27(5):166-176. 

In This Article

Patient Evaluation

Patients with isolated anteromedial knee arthritis may report pain localized to the medial joint line, but this finding is not reliable. Pain may be localized to any compartment or diffuse in the knee secondary to reactive synovitis. Presence of anterior knee pain should not be considered a contraindication to UKA because this finding has not shown to correlate with outcomes after medial UKA.[15] Patients with medial arthritis typically have a varus knee deformity, which should be passively correctable to neutral on valgus stress at 20° of flexion.[16] The integrity of the patient's collateral ligaments should be evaluated both preoperatively and intraoperatively. Physical examination tests such as Lachman test, pivot shift test, anterior drawer, and/or posterior drawer can be used to evaluate collateral ligament sufficiency preoperatively, but ultimately intraoperative evaluation of these structures will determine whether UKA can be performed.