Marcelo Fernandes Tribst1, Américo Zoppi2, José Carlos Silva Camargo3, Darlene Sassi3, Antonio Egydio de Carvalho4. 1. Universidade do Oeste Paulista - Presidente Prudente, SP, Brazil. 2. Faculdade de Ciências Médicas da Unicamp - Campinas, SP, Brazil. 3. Universidade Estadual Júlio Mesquita Filho - Presidente Prudente, SP, Brazil. 4. Department of Orthopedics and Traumatology of the School of Medicine of Universidade de São Paulo - São Paulo, SP, Brazil.
Abstract
OBJECTIVE: To carry out an anatomical study of the medial collateral ligament, an important elbow stabilizer in different degrees of elbow flexion-extension. METHODS: Forty elbows were dissected in order to analyze the functional behavior of the anterior, posterior and transverse ligament bands during valgus stress maneuvers of the elbow in different degrees of flexion and extension. Two groups were determined; in the group GPA the posterior band of the ligament was sectioned initially, then the articular capsule and finally the anterior band; in group GAP this order was reversed. RESULTS: Instability was observed in GPA only in the third stage, when there was a greater mean elbow's opening during the flexion (between 50° and 70°); in GAP, the instability was present since the first stage; the degrees of flexion with greater instability were the same as in group GPA. CONCLUSION: The anterior band of the medial collateral ligament of the elbow is the most important stabilizer of the elbow valgus instability, and its principal action occurs between 50° and 70° of elbow flexion. Level of Evidence III, Diagnostic Studies - Investigating a diagnostic test.
OBJECTIVE: To carry out an anatomical study of the medial collateral ligament, an important elbow stabilizer in different degrees of elbow flexion-extension. METHODS: Forty elbows were dissected in order to analyze the functional behavior of the anterior, posterior and transverse ligament bands during valgus stress maneuvers of the elbow in different degrees of flexion and extension. Two groups were determined; in the group GPA the posterior band of the ligament was sectioned initially, then the articular capsule and finally the anterior band; in group GAP this order was reversed. RESULTS: Instability was observed in GPA only in the third stage, when there was a greater mean elbow's opening during the flexion (between 50° and 70°); in GAP, the instability was present since the first stage; the degrees of flexion with greater instability were the same as in group GPA. CONCLUSION: The anterior band of the medial collateral ligament of the elbow is the most important stabilizer of the elbow valgus instability, and its principal action occurs between 50° and 70° of elbow flexion. Level of Evidence III, Diagnostic Studies - Investigating a diagnostic test.
Entities:
Keywords:
Articular instability; Elbow/lesion; Human
Authors: G H Callaway; L D Field; X H Deng; P A Torzilli; S J O'Brien; D W Altchek; R F Warren Journal: J Bone Joint Surg Am Date: 1997-08 Impact factor: 5.284
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