Clinical Orthopaedics and Related Research ®

A Publication of The Association of Bone and Joint Surgeons ®

Knee 443 articles


The Intact Posterior Cruciate Ligament Not Only Controls Posterior Displacement but Also Maintains the Flexion Gap

Yoshio Matsui PhD, MD, Yoshinori Kadoya PhD, MD, Shuji Horibe PhD, MD

The PCL is a strong stabilizer of the knee and provides posterior stability to the tibia. However, sagittal alignment of the PCL with the knee at 90┬░ flexion suggests the PCL might play a role not only in posterior stabilization but also in maintaining the flexion gap.

Distal Femur Rotation Relates to Joint Obliquity in ACL-deficient Chinese


The lower limb osteometry of Chinese differs from that of whites. The joint line of the knee in the coronal plane in Chinese is more medially inclined and the posterior condylar angle of the distal femur in the axial plane is larger. However, it is unclear whether there is any direct association between the coronal plane and axial plane osteometry.

High-flexion Prosthesis Improves Function of TKA in Asian Patients Without Decreasing Early Survivorship

Bum-Sik Lee MD, Jong-Won Chung MD, Jong-Min Kim MD, Kyung-Ah Kim PhD, Seong-Il Bin MD

Two previous studies recently raised the possibility of a high risk of early femoral components loosening with high-flexion (HF) prostheses in Asian populations and suggested that the high failure rate of HF TKAs was associated with HF ability. However, these findings are controversial given other studies reporting a low incidence of aseptic failures in HF prostheses.

Adding Triamcinolone Improves Viscosupplementation: A Randomized Clinical Trial

Gustavo Constantino Campos MD, Marcia U. Rezende MD, PhD, Alexandre F. Pailo MD, Renato Frucchi MD, Olavo Pires Camargo MD, PhD

Intraarticular injections, mainly using long-lasting corticosteroid suspensions, have long been used to treat knee osteoarthritis. Viscosupplementation is a relatively new approach with injection of a variety of agents. When comparing viscosupplementation with intraarticular injections of corticosteroids from baseline to the fourth week, steroids have been more effective for pain relief. By the fourth week they provide similar relief, but beyond that viscosupplementation appears to provide greater pain reduction. The delayed onset of symptomatic improvement combined with reports of reactive synovitis may discourage physicians and patients.

Does Patellectomy Jeopardize Function After TKA?

Reina Yao MD, Matthew C. Lyons MD, James L. Howard MD, MSc, FRCSC, James P. McAuley MD, FRCSC

The patella provides important mechanical leverage to the knee extensor mechanism. Patellectomy does not exclude the development of tibiofemoral arthrosis.

Painful Patellar Clunk or Crepitation of Contemporary Knee Prostheses

Won Chul Choi MD, PhD, Keun-Jung Ryu MD, Sahnghoon Lee MD, PhD, Sang Cheol Seong MD, PhD, Myung Chul Lee MD, PhD

Painful patellar clunk or crepitation (PCC) is a resurgent complication of contemporary posterior-stabilized TKA. The incidence, time to presentation, causes, and treatment of PCC still remain controversial.

Compress® Knee Arthroplasty Has 80% 10-year Survivorship and Novel Forms of Bone Failure

John H. Healey MD, Carol D. Morris MD, Edward A. Athanasian MD, Patrick J. Boland MD

Compliant, self-adjusting compression technology is a novel approach for durable prosthetic fixation of the knee. However, the long-term survival of these constructs is unknown.

Is Further Treatment Necessary for Patellar Crepitus After Total Knee Arthroplasty?

Bo-Hyun Hwang MD, Chang-Hyun Nam MD, PhD, Kwang-Am Jung MD, Alvin Ong MD, Su-Chan Lee MD

Patellar crepitus may occur with posterior-stabilized (PS) TKAs. Several studies have suggested numerous etiologies of patellar crepitus after PS-TKA with patellar resurfacing. However, it is unclear whether and to what degree crepitus influences pain and function without or with patellar resurfacing.

Case Report: Osteochondral Avulsion Fracture of the Posteromedial Bundle of the PCL in Knee Hyperflexion

Zhihong Xu MD, Dongyang Chen MD, Dongquan Shi MD, Qing Jiang PhD

Injury of the PCL of the knee in adults usually results in rupture rather than avulsion fracture and avulsions usually occur at the tibial insertion.