PMID- 3625361
OWN - NLM
STAT- MEDLINE
DCOM- 19871005
LR  - 20131121
IS  - 0736-0266 (Print)
IS  - 0736-0266 (Linking)
VI  - 5
IP  - 3
DP  - 1987
TI  - Accuracy and reproducibility of instrumented knee-drawer tests.
PG  - 378-87
AB  - Instrumented devices for knee-drawer tests have become popular in orthopaedics 
      relatively recently. The objective of the present study was to document the 
      effects of several parameters on the accuracy and reproducibility of 
      anterior-posterior (AP) drawer measurements. An instrumented knee-drawer tester 
      for AP laxity evaluations was constructed, based on the differential displacement 
      method, measuring shifts of the tuberosity relative to the patella. The accuracy 
      of the AP-shift was determined with the parallel use of a highly accurate 
      roentgen stereo photogrammetric (RSP) measurement system on two postmortem leg 
      specimens. The effects of relative motion between patella and femur were 
      negligible. In addition to AP shifts, significant knee flexion and tibial 
      rotations occurred, although the foot and the thigh were fixed as well as 
      possible. The differential displacement method was effective in circumventing 
      this problem. The accuracy of the AP shift was greater than 10%. The 
      reproducibility of the AP drawer parameters (shifts and compliances) was 
      determined in normal subjects and patients. Tests were made to evaluate the 
      effects of different observers, time sequences, and different days. In addition, 
      effects of muscle relaxation were studied. Overall, the shift parameters at 
      different forces were found to be reproducible to between 5 and 15%. The slopes 
      (compliances) of the laxity curves, at different forces, were found to be 
      reproducible between 20 and 40%. The reproducibility was principally affected by 
      deviations in the subject positioning procedure.
FAU - Edixhoven, P
AU  - Edixhoven P
FAU - Huiskes, R
AU  - Huiskes R
FAU - de Graaf, R
AU  - de Graaf R
FAU - van Rens, T J
AU  - van Rens TJ
FAU - Slooff, T J
AU  - Slooff TJ
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - J Orthop Res
JT  - Journal of orthopaedic research : official publication of the Orthopaedic 
      Research Society
JID - 8404726
SB  - IM
MH  - Biomechanical Phenomena
MH  - Humans
MH  - Joint Instability/*diagnosis/physiopathology
MH  - Knee Joint/*physiology/physiopathology
MH  - Ligaments, Articular/physiology/physiopathology
MH  - Methods
MH  - Microcomputers
MH  - Models, Biological
MH  - Movement
MH  - *Orthopedic Equipment
MH  - Photogrammetry
MH  - Software
EDAT- 1987/01/01 00:00
MHDA- 1987/01/01 00:01
CRDT- 1987/01/01 00:00
PHST- 1987/01/01 00:00 [pubmed]
PHST- 1987/01/01 00:01 [medline]
PHST- 1987/01/01 00:00 [entrez]
AID - 10.1002/jor.1100050310 [doi]
PST - ppublish
SO  - J Orthop Res. 1987;5(3):378-87. doi: 10.1002/jor.1100050310.