Minimally invasive medial hip approach for femoral head fixation: How much can we see and what is the anatomical at risk? – A cadaveric injection study. Issue 7 (July 2021)

• Record Type: Journal Article
• Authors: Boonperm, S.; Tangchitphisut, P.; Buranaphatthana, T.; Apivatthakakul, V.; Apivatthakakul, T.
• Is Part Of: Injury. Volume 52:Issue 7(2021)
• Page Start: 1679
• Page End: 1687
• Publication Date: 2021-07
• Subjects: Pipkin I -- Pipkin II -- Femoral head fracture -- Medial hip approach -- Femoral head visualization -- Fixation; Wounds and injuries -- Surgery -- Periodicals; Accidents -- Periodicals; Wounds and Injuries -- surgery -- Periodicals; Lésions et blessures -- Chirurgie -- Périodiques; Electronic journals; Electronic journals; 617.1
• DOI: 10.1016/j.injury.2021.04.040
• Languages: English
• ISSNs: 0020-1383

Abstract

Highlights: Medial hip approach is an alternative approach for fixation in femoral head fracture classification Pipkin type I and type II. It provides the access to the anteroinferior, medial, and small posteroinferior part of the femoral head below the fovea centralis. The structure at risk is the medial femoral circumflex artery and its deep branch and must be protected by meticulous surgical techniques. Abstract: Introduction: Most Pipkin I and II femoral head fractures are treated with either an anterior or a posterior approach. A medial hip approach is commonly used in children, and some surgeons have suggested it for femoral head fixation. The objectives of this study were to identify the structures at risk with the medial hip approach and to demonstrate the areas of the femoral head exposed using this approach. Methods: The first part of this study involved vascular injection conducted in four fresh human cadavers using the medial hip approach. The surgical technique was described and the structures at risk, mainly arteries, were identified. The second part was done in 14 hips to identify and measured the maximum exposure area of the femoral head with the medial hip approach. Results: The structures at risk with the medial hip approach were the medial femoral circumflex artery (MFCA) after it branches from the deep femoral artery and runs posteromedially across the femoral neck medial to the iliopsoas tendon and the deep branch of the MFCA lies over the posterior hip capsule. The femoral head exposure area in anterior view with anteroinferior articular cartilage exposure was 4.57 ± 1.09 cm 2 . In the medial view with the hip in internal rotation and in external rotation, the inferomedial articular cartilage exposure was 2.50 ± 1.52 cm 2 and 6.48 ± 2.29 cm 2, respectively, and the combined area of exposure was 9.49 ± 2.86 cm 2 . In the posterior view, the posteroinferior articular exposure was 1.69 ± 1.16 cm 2 . The medial hip approach allowed visualization of the small area of the posteroinferior articular cartilage in all specimens. The percentages of visualization of the femoral head articular cartilage in anterior view, medial view and posterior view were 50.07% ± 13.53, 45.56% ± 12.76 and 18.07% ± 11.27%, respectively. Conclusions: The structures at risk with the medial hip approach is the MFCA along the anterior acetabular rim and the deep branch on the posteromedial aspect of the femoral neck. It is an alternative which provides excellent access in Pipkin I and some part of Pipkin II, but it requires that the MFCA be protected by the use of meticulous surgical techniques.