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Vet Comp Orthop Traumatol 1995; 08(04): 170-176
DOI: 10.1055/s-0038-1632451
Clinical Report
Schattauer GmbH

Ununited Anconeal Process in the Dog. Pathogenesis and Treatment by Osteotomy of the Ulna

L. Sjöström
1   From the Strömsholm Referral Animal Hospital, Kolbäck, Sweden
,
H. Kasström
2   Gästrike Animal Hospital, Sandviken, Sweden
,
M. Källberg
3   Hälsingland Animal Clinic, Hudiksvall, Sweden
› Author Affiliations
Further Information

Publication History

Received for publication 05 May 1995

Publication Date:
09 February 2018 (online)

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Summary

Several hypotheses regarding the pathogenesis of Ununited Anconeal Process (UAP) have been proposed. One theory argues that the condition is caused by an incongruous growth of the radius relative to the ulna, causing proximal displacement of the radial head and subsequent abnormal pressure on the anconeal process. By comparing the radiographic outline of elbow joints with unilateral UAP with the outline of contralateral elbows, evidence in support of this theory is reported.

In accordance with the suggested pathogenesis of UAP, patients were treated surgically by osteotomy of the ulna to relieve pressure on the anconeal process and thus allow it to unite with the ulnar metaphysis. Results of surgery in 22 elbow joints in 20 dogs are reported; 21 UAPs united. In six cases a narrow radiolucent line remained between the anconeal process and the ulnar metaphysis, but judging from clinical performance and absence of secondary changes the anconeal process was firmly united. Short and long-term functional, clinical and radiographic results compare favourably with results reported previously after surgical resection of the UAP.

Ununited Anconeal Process (UAP) may be caused by an incongruous growth between the radius and the ulna, with proximal displacement of the radial head and a subsequent pressure on the anconeal process. Evidence in support of this theory is reported. Results, after ulnar osteotomy to relieve the pressure, compare favourably with results reported after surgical resection of the UAP.

Keywords

Ununited Anconeal Process - pathogenesis - incongruous growth - ulnar osteotomy
 

  • REFERENCES

  • 1 Berzon JL, Quicic CB. Fragmented coronoid process: anatomical, clinical and radiographic considerations with case analysis. JAAHA 1980; 16 (02) 241-50.
    PubMedGoogle Scholar
  • 2 Miller ME, Christensen GC, Evans HE. Ligaments and joints of the thoracic limb. In: Anatomy of the Dog. Philadelphia: Saunders; 1993: 243-7.
    Google Scholar
  • 3 Olsson SE. Osteochondros hos hund. Svensk Veterinartidning 1977; 29: 547-72.
    PubMedGoogle Scholar
  • 4 Alexander JW. et al Malformation of canine forelimb due to synostosis between radius and ulna. JAVMA 1978; 173 (10) 1328-30.
    PubMedGoogle Scholar
  • 5 Ljunggren G, Cawley AJ. Archibald J. Elbow dysplasia in the dog. JAVMA 1966; 148: 887-91.
    PubMedGoogle Scholar
  • 6 Van Sickle DC. The relationship of ossification to canine elbow dysplasia. Anim Hosp 1966; 2: 24-31.
    PubMedGoogle Scholar
  • 7 Sinibaldi KR, Arnozczky SP. Surgical removal of the ununited anconeal process in the dog. J A A H A 1975; 11 (02) 192-8.
    PubMedGoogle Scholar
  • 8 Fox SM, Bloomberg MS, Bright RM. Developmental anomalies of the canine elbow. JAAHA 1983; 19: 605-15.
    PubMedGoogle Scholar
  • 9 Guthrie S. Some radiographic and clinical aspects of ununited anconeal process in the dog. Vet Rec 1989; 124: 661-2.
    CrossrefPubMedGoogle Scholar
  • 10 Stevens DR, Sande RD. An elbow dysplasia syndrome in the dog. JAVMA 1974; 165 (12) 1065-9.
    PubMedGoogle Scholar
  • 11 Herron MR. Ununited anconeal process in the dog. Vet Clin North Am 1971; 1 (03) 417-28.
    PubMedGoogle Scholar
  • 12 Olsson SE. Pathophysiology, morphology and clinical signs of osteochondrosis in the dog. In: Disease Mechanisms in Small Animal Surgery. Boyrab MJ. ed Philadelphia: Saunders; 1993: 777-96.
    Google Scholar
  • 13 Cawley AJ, Archibald J. Ununited anconeal process in the dog. JAVMA 1959; 134: 454-8.
    PubMedGoogle Scholar
  • 14 Corley EA, Sutherland TM, Carlsson WD. Genetic aspects of canine elbow dysplasia. JAVMA 1968; 153: 543-7.
    PubMedGoogle Scholar
  • 15 Wind AP. Elbow incongruity and developmental elbow disease in the dog: Part 2. JAAHA 1986; 22: 725-30.
    PubMedGoogle Scholar
  • 16 Olsson SE. Osteochondrosis of the canine elbow joint. Pathogenesis and a new approach to the surgical treatment of ununited anconeal process. In: Proceedings, 18th Congress of the European Society of Veterinary Surgery. 1990
    Google Scholar
  • 17 Olsson SE, Jerre S, Kasstrom H. Pathogenesis of ununited anconeal process, fragmentation of the medial coronoid process and osteochondrosis dissecans of the canine elbow joint. In: Proceedings, 9th Congress of the Society for Veterinary Radiology. 1991
    Google Scholar
  • 18 Wind AP. Elbow incongruity and developmental elbow disease in the dog: Part 1. JAAHA 1986; 22: 711-24.
    PubMedGoogle Scholar
  • 19 Punzet G. Ellbogengelenksdysplasie mit isoliertem Processus anconaeus, eine neue Möglichkeit der chirurgischen Behandlung. Kleintierpraxis 1973; 18 (05) 121-32.
    PubMedGoogle Scholar
  • 20 Wenzel U. Zur Klinik und Exstirpation des isolierten Processus anconaeus bei der Ellbogengelenksdysplasie des Hundes. Kleintierpraxis 1975; 20: 55-63.
    PubMedGoogle Scholar
  • 21 Pritchard DL. Anconeal process pseudoarthrosis treated with lag screw fixation. Canine Practice 1976; 18-23.
    PubMedGoogle Scholar