The effect of tibial rotation on knee medial and lateral compartment contact pressure

Purpose The progression of knee osteoarthritis (OA) is determined in part by mechanical effects on local structures. The mechanical influences of limb malalignment on cartilage loss are well known; however, the effect of rotational deformities on knee OA is not yet known. The aim of the current stud...

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Published in:Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA sports traumatology, arthroscopy : official journal of the ESSKA, 2016-01, Vol.24 (1), p.79-83
Main Authors: Yazdi, Hamidreza, Mallakzadeh, Mohammadreza, Sadat Farshidfar, Sara, Givehchian, Behrooz, Daneshparvar, Hamidreza, Behensky, Hannes
Format: Article
Language:English
Subjects:
Arthritis
Biomechanical Phenomena
Bone Malalignment - physiopathology
Bone surgery
Cadaver
Cadavers
Cartilage
Female
Fibula - surgery
Humans
Knee
Knee Joint - physiopathology
Legal medicine
Medicine
Medicine & Public Health
Orthopedics
Osteoarthritis
Osteoarthritis, Knee - physiopathology
Osteotomy
Pressure
Rotation
Tibia - physiopathology
Tibia - surgery
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Summary:Purpose The progression of knee osteoarthritis (OA) is determined in part by mechanical effects on local structures. The mechanical influences of limb malalignment on cartilage loss are well known; however, the effect of rotational deformities on knee OA is not yet known. The aim of the current study was to evaluate the effect of tibial rotation on knee medial and lateral compartment contact pressure. Methods The left knees of six fresh whole-body cadavers were used in this study. Fujifilm Prescale super-low type film was used for contact pressure measurement. The films were inserted into the joint after arthrotomy. The cadavers were stabilized with a custom-made device, and axial force of half body weight specific to each cadaver was applied to the plantar surface of the feet. The examination was repeated after osteotomy of the fibula and tibia, and the tibia was then rotated 15° or 30° internally (IR) or externally (ER) and securely fixed. The resulting films were scanned, and CP was determined using appropriate software. Results The p values for increased medial compartment contact pressure at 15° and 30° IR and 30° ER were 0.016, 0.025, and 0.025, respectively. For decreased medial compartment contact pressure at 15° ER, the p value was 0.020. The p values for increased lateral compartment contact pressure at 15° and 30° ER were 0.010 and 0.030, respectively. In this compartment, contact pressure changes at 15° and 30° IR were not significant. Conclusion This experimental study demonstrated that 15° IR of the tibial shaft increased contact pressure and 15° ER decreased contact pressure over the knee medial compartment.
ISSN:0942-2056
1433-7347
DOI:10.1007/s00167-014-3321-x