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Overcorrection after open-wedge high tibial osteotomy performed without considering the JLCA. a. Patient complain medial pain due to previous history of meniscectomy, the preoperative global alignment is 3° varus, Medial proximal tibial angle (MPTA) = 86° and Joint line convergence angle (JLCA) = 5°, b. an intended correction of 6° is performed with a postoperative MPTA = 92° but C. the patient had a postoperative overcorrection of 7° valgus with a JLCA = 0°
