Ulnar impaction syndrome: ulnar wrist pain related to altered mechanics between ulna, triangular fibrocartilage (TFC), lunate, and triquetrum
Ulnar styloid impaction: excessively long or fractured ulnar styloid impinges triquetrum
Radial styloid impingement: styloid impingement on dorsal scaphoid with forced radial deviation
Dorsal impingement: impingement of distal radius on scaphoid ± lunate
Scaphoid impaction syndrome: impaction of dorsal scaphoid by dorsal radius
Hamatolunate impaction: medial wrist pain related to cartilage loss of proximal hamate
IMAGING
General Features
Radiographic Findings
CT Findings
Nuclear Medicine Findings
MR Findings
Imaging Recommendations
DIFFERENTIAL DIAGNOSIS
PATHOLOGY
General Features
Staging, Grading, & Classification
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
Treatment
DIAGNOSTIC CHECKLIST
Consider
Image Interpretation Pearls
Selected References
Lim W et al: Review article: the differential diagnosis of bone marrow edema on wrist MRI. Skeletal Radiol. 48(10):1525-39, 2019
Sachar K: Ulnar-sided wrist pain: evaluation and treatment of triangular fibrocartilage complex tears, ulnocarpal impaction syndrome, and lunotriquetral ligament tears. J Hand Surg Am. 37(7):1489-500, 2012
Sammer DM et al: Ulnar impaction. Hand Clin. 26(4):549-57, 2010
Crema MD et al: MDCT arthrography features of ulnocarpal impaction syndrome. AJR Am J Roentgenol. 193(5):1376-81, 2009
Greenberg JA: Reconstruction of the distal ulna: instability, impaction, impingement, and arthrosis. J Hand Surg Am. 34(2):351-6, 2009
Bickel KD: Arthroscopic treatment of ulnar impaction syndrome. J Hand Surg Am. 33(8):1420-3, 2008
Henry M: Arthroscopic management of dorsal wrist impingement. J Hand Surg Am. 33(7):1201-4, 2008
Webb BG et al: Gymnastic wrist injuries. Curr Sports Med Rep. 7(5):289-95, 2008
Rettig AC: Athletic injuries of the wrist and hand: part II: overuse injuries of the wrist and traumatic injuries to the hand. Am J Sports Med. 32(1):262-73, 2004
Steinborn M et al: MR imaging of ulnocarpal impaction after fracture of the distal radius. AJR Am J Roentgenol. 181(1):195-8, 2003
Cerezal L et al: Imaging findings in ulnar-sided wrist impaction syndromes. Radiographics. 22(1):105-21, 2002
Nakamura K et al: Type I versus type II lunates: ligament anatomy and presence of arthrosis. J Hand Surg Am. 26(3):428-36, 2001
Thurston AJ et al: Hamato-lunate impingement: an uncommon cause of ulnar-sided wrist pain. Arthroscopy. 16(5):540-4, 2000
Viegas SF et al: Medial (hamate) facet of the lunate. J Hand Surg Am. 15(4):564-71, 1990
Ulnar impaction syndrome: ulnar wrist pain related to altered mechanics between ulna, triangular fibrocartilage (TFC), lunate, and triquetrum
Ulnar styloid impaction: excessively long or fractured ulnar styloid impinges triquetrum
Radial styloid impingement: styloid impingement on dorsal scaphoid with forced radial deviation
Dorsal impingement: impingement of distal radius on scaphoid ± lunate
Scaphoid impaction syndrome: impaction of dorsal scaphoid by dorsal radius
Hamatolunate impaction: medial wrist pain related to cartilage loss of proximal hamate
IMAGING
General Features
Radiographic Findings
CT Findings
Nuclear Medicine Findings
MR Findings
Imaging Recommendations
DIFFERENTIAL DIAGNOSIS
PATHOLOGY
General Features
Staging, Grading, & Classification
CLINICAL ISSUES
Presentation
Demographics
Natural History & Prognosis
Treatment
DIAGNOSTIC CHECKLIST
Consider
Image Interpretation Pearls
Selected References
Lim W et al: Review article: the differential diagnosis of bone marrow edema on wrist MRI. Skeletal Radiol. 48(10):1525-39, 2019
Sachar K: Ulnar-sided wrist pain: evaluation and treatment of triangular fibrocartilage complex tears, ulnocarpal impaction syndrome, and lunotriquetral ligament tears. J Hand Surg Am. 37(7):1489-500, 2012
Sammer DM et al: Ulnar impaction. Hand Clin. 26(4):549-57, 2010
Crema MD et al: MDCT arthrography features of ulnocarpal impaction syndrome. AJR Am J Roentgenol. 193(5):1376-81, 2009
Greenberg JA: Reconstruction of the distal ulna: instability, impaction, impingement, and arthrosis. J Hand Surg Am. 34(2):351-6, 2009
Bickel KD: Arthroscopic treatment of ulnar impaction syndrome. J Hand Surg Am. 33(8):1420-3, 2008
Henry M: Arthroscopic management of dorsal wrist impingement. J Hand Surg Am. 33(7):1201-4, 2008
Webb BG et al: Gymnastic wrist injuries. Curr Sports Med Rep. 7(5):289-95, 2008
Rettig AC: Athletic injuries of the wrist and hand: part II: overuse injuries of the wrist and traumatic injuries to the hand. Am J Sports Med. 32(1):262-73, 2004
Steinborn M et al: MR imaging of ulnocarpal impaction after fracture of the distal radius. AJR Am J Roentgenol. 181(1):195-8, 2003
Cerezal L et al: Imaging findings in ulnar-sided wrist impaction syndromes. Radiographics. 22(1):105-21, 2002
Nakamura K et al: Type I versus type II lunates: ligament anatomy and presence of arthrosis. J Hand Surg Am. 26(3):428-36, 2001
Thurston AJ et al: Hamato-lunate impingement: an uncommon cause of ulnar-sided wrist pain. Arthroscopy. 16(5):540-4, 2000
Viegas SF et al: Medial (hamate) facet of the lunate. J Hand Surg Am. 15(4):564-71, 1990
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