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Hallinan JTPD, Statum SM, Huang BK, Bezerra HG, Garcia DAL, Bydder GM, Chung CB. High-Resolution MRI of the First Metatarsophalangeal Joint: Gross Anatomy and Injury Characterization. Radiographics 2020; 40:1107-1124. [PMID: 32412828 DOI: 10.1148/rg.2020190145] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The first metatarsophalangeal joint (MTPJ) is vital to the biomechanics of the foot and supports a weight up to eight times heavier than the body during athletic activities. The first MTPJ comprises osseous and cartilaginous surfaces along with a complex of supporting structures, including the dorsal extensor tendons, collateral ligaments, and a plantar plate complex. In contradistinction to the lesser MTPJ plantar plates, a single dominant fibrocartilaginous capsular thickening does not exist at the first MTPJ. Instead, the plantar plate complex comprises a fibrocartilaginous pad that invests the hallux sesamoids and is inseparable from the plantar capsule, the intersesamoid ligament, paired metatarsosesamoid and sesamoid phalangeal ligaments (SPLs), and the musculotendinous structures. Acute injury at the first MTPJ is typically secondary to forced hyperextension-turf toe-and can involve multiple structures. During hyperextension, the resulting forces primarily load the distal SPLs, making these structures more susceptible to injury. SPL injuries are best seen in the sagittal plane at MRI. Radiography can also aid in diagnosis of full-thickness SPL tears, demonstrating reduced sesamoid excursion at lateral dorsiflexed (stress) views. Hallux valgus is another common condition, resulting in progressive disabling deformity at the first MTPJ. Without appropriate treatment, first MTPJ injuries may progress to degenerative hallux rigidus. The authors detail the anatomy of the first MTPJ in cadaveric forefeet by using high-resolution 3-T and 11.7-T MRI and anatomic-pathologic correlation. Injuries to the plantar plate complex, collateral ligaments, and extensor mechanism are discussed using clinical case examples. Online supplemental material is available for this article. ©RSNA, 2020.
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Affiliation(s)
- James T P D Hallinan
- From the Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Rd, 119074 Singapore (J.T.P.D.H.); Yong Loo Lin School of Medicine, National University of Singapore, Singapore (J.T.P.D.H.); Department of Radiology, VA San Diego Healthcare System, San Diego, Calif (S.M.S., G.M.B., C.B.C.); Department of Radiology, San Diego Medical Center, University of California, San Diego, Calif (B.K.H., C.B.C.); Department of Radiology, Hospital do Coração (HCor) and Teleimagem, São Paulo, Brazil (H.G.B.); and Universidade Federal de São Paulo, São Paulo, Brazil (UNIFESP) and Hospital Beneficência Portuguesa de São Paulo, São Paulo, Brazil (D.A.L.G.)
| | - Sheronda M Statum
- From the Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Rd, 119074 Singapore (J.T.P.D.H.); Yong Loo Lin School of Medicine, National University of Singapore, Singapore (J.T.P.D.H.); Department of Radiology, VA San Diego Healthcare System, San Diego, Calif (S.M.S., G.M.B., C.B.C.); Department of Radiology, San Diego Medical Center, University of California, San Diego, Calif (B.K.H., C.B.C.); Department of Radiology, Hospital do Coração (HCor) and Teleimagem, São Paulo, Brazil (H.G.B.); and Universidade Federal de São Paulo, São Paulo, Brazil (UNIFESP) and Hospital Beneficência Portuguesa de São Paulo, São Paulo, Brazil (D.A.L.G.)
| | - Brady K Huang
- From the Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Rd, 119074 Singapore (J.T.P.D.H.); Yong Loo Lin School of Medicine, National University of Singapore, Singapore (J.T.P.D.H.); Department of Radiology, VA San Diego Healthcare System, San Diego, Calif (S.M.S., G.M.B., C.B.C.); Department of Radiology, San Diego Medical Center, University of California, San Diego, Calif (B.K.H., C.B.C.); Department of Radiology, Hospital do Coração (HCor) and Teleimagem, São Paulo, Brazil (H.G.B.); and Universidade Federal de São Paulo, São Paulo, Brazil (UNIFESP) and Hospital Beneficência Portuguesa de São Paulo, São Paulo, Brazil (D.A.L.G.)
| | - Higor Grando Bezerra
- From the Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Rd, 119074 Singapore (J.T.P.D.H.); Yong Loo Lin School of Medicine, National University of Singapore, Singapore (J.T.P.D.H.); Department of Radiology, VA San Diego Healthcare System, San Diego, Calif (S.M.S., G.M.B., C.B.C.); Department of Radiology, San Diego Medical Center, University of California, San Diego, Calif (B.K.H., C.B.C.); Department of Radiology, Hospital do Coração (HCor) and Teleimagem, São Paulo, Brazil (H.G.B.); and Universidade Federal de São Paulo, São Paulo, Brazil (UNIFESP) and Hospital Beneficência Portuguesa de São Paulo, São Paulo, Brazil (D.A.L.G.)
| | - Diego A L Garcia
- From the Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Rd, 119074 Singapore (J.T.P.D.H.); Yong Loo Lin School of Medicine, National University of Singapore, Singapore (J.T.P.D.H.); Department of Radiology, VA San Diego Healthcare System, San Diego, Calif (S.M.S., G.M.B., C.B.C.); Department of Radiology, San Diego Medical Center, University of California, San Diego, Calif (B.K.H., C.B.C.); Department of Radiology, Hospital do Coração (HCor) and Teleimagem, São Paulo, Brazil (H.G.B.); and Universidade Federal de São Paulo, São Paulo, Brazil (UNIFESP) and Hospital Beneficência Portuguesa de São Paulo, São Paulo, Brazil (D.A.L.G.)
| | - Graeme M Bydder
- From the Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Rd, 119074 Singapore (J.T.P.D.H.); Yong Loo Lin School of Medicine, National University of Singapore, Singapore (J.T.P.D.H.); Department of Radiology, VA San Diego Healthcare System, San Diego, Calif (S.M.S., G.M.B., C.B.C.); Department of Radiology, San Diego Medical Center, University of California, San Diego, Calif (B.K.H., C.B.C.); Department of Radiology, Hospital do Coração (HCor) and Teleimagem, São Paulo, Brazil (H.G.B.); and Universidade Federal de São Paulo, São Paulo, Brazil (UNIFESP) and Hospital Beneficência Portuguesa de São Paulo, São Paulo, Brazil (D.A.L.G.)
| | - Christine B Chung
- From the Department of Diagnostic Imaging, National University Hospital, 5 Lower Kent Ridge Rd, 119074 Singapore (J.T.P.D.H.); Yong Loo Lin School of Medicine, National University of Singapore, Singapore (J.T.P.D.H.); Department of Radiology, VA San Diego Healthcare System, San Diego, Calif (S.M.S., G.M.B., C.B.C.); Department of Radiology, San Diego Medical Center, University of California, San Diego, Calif (B.K.H., C.B.C.); Department of Radiology, Hospital do Coração (HCor) and Teleimagem, São Paulo, Brazil (H.G.B.); and Universidade Federal de São Paulo, São Paulo, Brazil (UNIFESP) and Hospital Beneficência Portuguesa de São Paulo, São Paulo, Brazil (D.A.L.G.)
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Thomas RL, Kuiper JH, Knight TP. Properties and Function of the Flexor Hallucis Capsularis Interphalangeus Tendon. Clin Anat 2019; 33:689-695. [PMID: 31581316 DOI: 10.1002/ca.23490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 09/18/2019] [Accepted: 09/24/2019] [Indexed: 11/06/2022]
Abstract
INTRODUCTION The fibrocartilagenous plantar plates of the forefoot are biomechanically important, forming the primary distal attachment for the plantar aponeurosis. They are integral to the function of the windlass mechanism in supporting the arches of the foot in gait. Dissection of the cadaveric hallux revealed an organised sagittal thickening of the dorsal side of the flexor hallucis longus (FHL) sheath, which attached the interphalangeal plantar plate to the metatarsophalangeal (MTP) plantar plate. A description of a similar structure was made in 1984 when it was termed the flexor hallucis capsularis interphalangeus (FHCI) - however, it has not been researched since, and we aim to study it further and identify its characteristics. METHOD Eight specimens were dissected from four cadavers. Two were stained and examined under magnification in both polarized and non polarized light. The remaining 6 were subjected to micrometer testing of their tensile properties. RESULTS Both the histological features and mechanical properties were consistent with tendon; with cross sectional area, ultimate tensile strength and stiffness varying between specimens. CONCLUSIONS Based on its location and properties, the FHCI tendon may be involved in limiting dorsiflexion of the first MTP joint and could have clinical relevance in pathological processes around both the first and second MTP joints. Clin. Anat., 33:689-695, 2020. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- R L Thomas
- Plastic Surgery Department, Derriford Hospital, Plymouth, United Kingdom
| | - Jan H Kuiper
- Institute for Science and Technology in Medicine, Keele University, Staffordshire, United Kingdom
| | - Timothy P Knight
- The Robert Jones and Agnes Hunt Orthopaedic Hospital, NHS Foundation Trust, Oswestry, United Kingdom
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