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Anatomic Magnetic Resonance Imaging Measurements in First-Time Patellar Dislocators by Sex and Age.
J Athl Train 2019; 54(8):901-905JA

Abstract

CONTEXT

Anatomic differences of the knee in first-time patellar dislocators have not been clearly elucidated.

OBJECTIVE

To compare structural differences of the knee in those who have sustained an acute first-time patellar dislocation resulting in a medial patellofemoral ligament (MPFL) tear by sex and age (≤17 years old, ≥18 years old).

DESIGN

Case series.

SETTING

Retrospective magnetic resonance imaging analysis.

PATIENTS OR OTHER PARTICIPANTS

Thirty-five acute first-time patellar dislocators with an associated MPFL tear.

MAIN OUTCOME MEASURE(S)

Patellar height using 3 methods, patellar alignment using congruency angles, and trochlear morphology using the sulcus angle. We compared the means of these variables by sex and age. The intraclass correlation coefficient was then calculated to assess the agreement of the independent reviewers.

RESULTS

A total of 21 left and 14 right knees were analyzed. The MPFL tear location did not differ by sex (P = .34) or age (P = .43). Patellar height did not differ as measured by the Caton-Deschamps ratio (P = .29 for sex, P = .49 for age), Insall-Salvati index (P = .15 for sex, P = .33 for age), or patellotrochlear index (P = .67 for sex, P = .49 for age). The congruence angle (P = .81 for sex, P = .06 for age) and trochlear morphology as measured by the sulcus angle (P = .64 for sex, P = .45 for age) were similar between groups.

CONCLUSIONS

Patellar height and trochlear morphology did not differ by sex or age among patients whose first-time patellar dislocations resulted in an MPFL tear. In addition, the location of the tear did not appear to vary by sex or age.

Authors+Show Affiliations

Department of Orthopaedic Surgery, Duke University Medical Center, Durham, NC.Department of Orthopaedic Surgery, Duke University Medical Center, Durham, NC.Department of Orthopaedic Surgery, Duke University Medical Center, Durham, NC.Department of Orthopaedic Surgery, Duke University Medical Center, Durham, NC.Division of Public Health, Study Design, and Biostatistics Center, University of Utah School of Medicine, Salt Lake City.Department of Orthopaedic Surgery, Duke University Medical Center, Durham, NC.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31355669

Citation

Grimm, Nathan L., et al. "Anatomic Magnetic Resonance Imaging Measurements in First-Time Patellar Dislocators By Sex and Age." Journal of Athletic Training, vol. 54, no. 8, 2019, pp. 901-905.
Grimm NL, Wooster BM, Tainter DM, et al. Anatomic Magnetic Resonance Imaging Measurements in First-Time Patellar Dislocators by Sex and Age. J Athl Train. 2019;54(8):901-905.
Grimm, N. L., Wooster, B. M., Tainter, D. M., Kildow, B. J., Kim, J., & Taylor, D. C. (2019). Anatomic Magnetic Resonance Imaging Measurements in First-Time Patellar Dislocators by Sex and Age. Journal of Athletic Training, 54(8), pp. 901-905. doi:10.4085/1062-6050-280-18.
Grimm NL, et al. Anatomic Magnetic Resonance Imaging Measurements in First-Time Patellar Dislocators By Sex and Age. J Athl Train. 2019;54(8):901-905. PubMed PMID: 31355669.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Anatomic Magnetic Resonance Imaging Measurements in First-Time Patellar Dislocators by Sex and Age. AU - Grimm,Nathan L, AU - Wooster,Benjamin M, AU - Tainter,David M, AU - Kildow,Beau J, AU - Kim,Jaewhan, AU - Taylor,Dean C, Y1 - 2019/07/29/ PY - 2020/08/01/pmc-release PY - 2019/7/30/pubmed PY - 2019/12/28/medline PY - 2019/7/30/entrez KW - anatomy KW - knee KW - medial patellofemoral ligament KW - trochlea SP - 901 EP - 905 JF - Journal of athletic training JO - J Athl Train VL - 54 IS - 8 N2 - CONTEXT: Anatomic differences of the knee in first-time patellar dislocators have not been clearly elucidated. OBJECTIVE: To compare structural differences of the knee in those who have sustained an acute first-time patellar dislocation resulting in a medial patellofemoral ligament (MPFL) tear by sex and age (≤17 years old, ≥18 years old). DESIGN: Case series. SETTING: Retrospective magnetic resonance imaging analysis. PATIENTS OR OTHER PARTICIPANTS: Thirty-five acute first-time patellar dislocators with an associated MPFL tear. MAIN OUTCOME MEASURE(S): Patellar height using 3 methods, patellar alignment using congruency angles, and trochlear morphology using the sulcus angle. We compared the means of these variables by sex and age. The intraclass correlation coefficient was then calculated to assess the agreement of the independent reviewers. RESULTS: A total of 21 left and 14 right knees were analyzed. The MPFL tear location did not differ by sex (P = .34) or age (P = .43). Patellar height did not differ as measured by the Caton-Deschamps ratio (P = .29 for sex, P = .49 for age), Insall-Salvati index (P = .15 for sex, P = .33 for age), or patellotrochlear index (P = .67 for sex, P = .49 for age). The congruence angle (P = .81 for sex, P = .06 for age) and trochlear morphology as measured by the sulcus angle (P = .64 for sex, P = .45 for age) were similar between groups. CONCLUSIONS: Patellar height and trochlear morphology did not differ by sex or age among patients whose first-time patellar dislocations resulted in an MPFL tear. In addition, the location of the tear did not appear to vary by sex or age. SN - 1938-162X UR - https://www.unboundmedicine.com/medline/citation/31355669/Anatomic_Magnetic_Resonance_Imaging_Measurements_in_First-Time_Patellar_Dislocators_by_Sex_and_Age L2 - https://medlineplus.gov/mriscans.html DB - PRIME DP - Unbound Medicine ER -