Author: Haw Chong Chang

January 17, 2016 Haw Chong Chang

Knee Osteoarthritis – Should I Go for a TKR (Total Knee Replacement)? Knee Osteoarthritis – It is a painful condition of the knee joint where the smooth lining (articular cartilage) of the ends of the thigh bone and shin bone forming the knee joint becomes worn out or rough. It causes stiffness, pain, swelling and…

September 21, 2014 Haw Chong Chang

Accuracy of Component Implantation What You Plan is What You Get Pearle in his series of 10 cases of robot-assisted UKA concluded that the difference between planned and intraoperative tibiofemoral angle was within 1° and the postoperative long leg axis radiographs were within 1.6°. –Pearle AD, O’Loughlin PF, Kendoff DO. Robot-assisted unicompartmental knee arthroplasty. J…

September 21, 2014 Haw Chong Chang

How Accurate Are We With Conventional Surgical Methods? As many as 40% to 60% of components may be malaligned by more than 2° from the preoperative plan with conventional methods. –Cobb J, Henckel J, Gomes P, Harris S, Jakopec M, Rodriguez F, et al. Handson robotic unicompartmental knee replacement. J Bone Joint Surg Br. 2006…

September 21, 2014 Haw Chong Chang

Implant Malposition Resulting in Early Failures Concerns with UKA are early failure of the femoral or tibial components. The main cause of early failure is malpositioning of components with overcorrection or undercorrection of limb alignment. –Mariani EM, Bourne MH, Jackson RT, Jackson ST, Jones P. Early failure of unicompartmental knee arthroplasty. J Arthroplasty. 2007 Sep;22(6…

September 21, 2014 Haw Chong Chang

Unicompartmental knee arthroplasty (UKA) can provide durable pain relief and functional improvement in greater than 90% of patients with focal arthritis or osteonecrosis of the medial or lateral compartments of the knee. –Borus T, Thornhill T. Unicompartmental knee arthroplasty. J Am Acad Orthop Surg. 2008 Jan;16(1):9–18.