J Knee Surg 2012; 25(01): 071-074
DOI: 10.1055/s-0031-1299664
Original Article
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Determining the Isometric Point of the Knee

James P. Stannard
1  Department of Orthopaedic Surgery, University of Missouri Hospital, Columbia, Missouri
,
Allan Hammond
2  Division of Orthopaedic Surgery, Department of Surgery, University of Manitoba, Winnipeg, Manitoba, Canada
,
Danny Tunmire
3  Division of Orthopaedic Surgery, Department of Surgery, University of Alabama-Birmingham, Birmingham, Alabama
,
Matthew Clayton
3  Division of Orthopaedic Surgery, Department of Surgery, University of Alabama-Birmingham, Birmingham, Alabama
,
Chris Johnson
3  Division of Orthopaedic Surgery, Department of Surgery, University of Alabama-Birmingham, Birmingham, Alabama
,
Cid Moura
3  Division of Orthopaedic Surgery, Department of Surgery, University of Alabama-Birmingham, Birmingham, Alabama
› Author Affiliations
Further Information

Publication History

02 June 2011

09 September 2011

Publication Date:
12 April 2012 (online)

Abstract

Posteromedial and posterolateral reconstructions of the knee are frequently required in the management of knee dislocations. This study compares the accuracy of radiographic reference points to established anatomical landmarks in reproducing the isometric points of the posteromedial corner and posterolateral corner (PLC) of the knee. Posteromedial and posterolateral surgical approaches were made in 20 cadaveric knees. The posteromedial and posterolateral isometric points of each femur were determined using the anatomic landmarks and radiographic reference points in a randomized order. An Isometer was used to measure the displacement, to the nearest millimeter; knees were passed into flexion. A two-tailed t-test was used to analyze the data and statistical significance was set to p < 0.05. For the isometric point of the PLC, the radiographic method resulted in a mean displacement of 1.63 mm as the knee was passed from extension into flexion, while the anatomic method had a mean displacement of 4.84 mm (p < 0.00018). The mean displacement on the posteromedial side using the radiographic method was 2.10 mm as the knee was passed from extension into flexion, while the anatomic method resulted in 3.21 mm of displacement (p = 0.074).