Medial Deviation of Prosthetic Trochlear Groove in Knee Arthroplasty
Author Information
Author(s): Jeremic Dragan V. MD, Bellemans Johan MD, PhD, Sappey-Marinier Elliot MD, PhD, Howell Stephen M. MD, Hettwer Werner MD, Hull Maury L. PhD
Hypothesis
Medial deviation of a 6° prosthetic trochlear groove occurs in more than one CPAK type.
Conclusion
A medial deviation of the 6° PTG occurred in more than half of the KA TKAs and was observed in 4 of 6 CPAK types.
Supporting Evidence
- Fifty-one percent of KA TKAs had a medial deviation of the PTG.
- The median FJS of CPAK III was significantly lower than I and IV.
- The minimum PTG angle required to prevent medial deviation by at least 2° in all patients is 17°.
Takeaway
In knee surgeries, more than half of the patients had a problem with the knee joint alignment, which can lead to lower satisfaction scores. To fix this, doctors should use a different angle for the knee joint part.
Methodology
The study analyzed 296 KA TKAs with a postoperative long-leg scanogram and a 2-year FJS score.
Potential Biases
The study may not generalize well due to the specific patient selection criteria and exclusion of certain conditions.
Limitations
The method for defining the orientation of the quadriceps’ line of pull is an approximation and does not account for muscle volume variations.
Participant Demographics
The included subjects had a mean age of 69 years, with 157 females and 126 males.
Statistical Information
P-Value
P < .05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website