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The clamshell fracture and adjunctive acetabuloplasty in the arthroscopic osteosynthesis of femoral head fractures with femoroacetabular impingement.

ABSTRACT: The clamshell fracture of the femoral head and its arthroscopic osteosynthesis are described. This suprafoveal osteochondral fracture may have folded onto itself during closed reduction of the associated anterior hip dislocation. The resultant fracture fragment had almost circumferential chondral coverage that required arthroscopic manipulation to "pry apart the clamshell," permitting arthroscopic reduction. This patient also had pre-existing silent femoroacetabular impingement, and the novel use of arthroscopic acetabuloplasty permitted internal fixation by improving the path for headless screw fixation. The arthroscopic techniques and clinical outcome at greater than 2 years are presented. Albeit rare, the clamshell fracture configuration should be recognized and may be amenable to successful arthroscopic osteosynthesis. Of broader clinical impact and application, adjunctive acetabuloplasty may permit the successful osteosynthesis of select femoral head fractures in patients with concurrent acetabular overcoverage by completely arthroscopic techniques that engage both the fracture fragment and the attractive benefits of less invasive surgery.

SUBMITTER: Matsuda DK

PROVIDER: S-EPMC3678644 | biostudies-other | 2012 Sep

REPOSITORIES: biostudies-other

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The clamshell fracture and adjunctive acetabuloplasty in the arthroscopic osteosynthesis of femoral head fractures with femoroacetabular impingement.

Matsuda Dean K DK

Arthroscopy techniques 20120209 1

The clamshell fracture of the femoral head and its arthroscopic osteosynthesis are described. This suprafoveal osteochondral fracture may have folded onto itself during closed reduction of the associated anterior hip dislocation. The resultant fracture fragment had almost circumferential chondral coverage that required arthroscopic manipulation to "pry apart the clamshell," permitting arthroscopic reduction. This patient also had pre-existing silent femoroacetabular impingement, and the novel us ...[more]

PMID: 23766975

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Project description:Femoroacetabular impingement (FAI), characterized by a pathological contact between the proximal femur and acetabulum, is a common precursor of hip osteoarthritis. Cam morphology is a bony prominence that causes FAI and frequently forms on the anterosuperior femoral head-neck junction. Despite anatomical consensus regarding the femoral head-neck junction as a boundary area covered by the articular cartilage and joint capsule, it remains unclear whether the joint capsule is continuous with the anterosuperior articular cartilage. For the anatomical consideration of cam morphology formation, this study aimed to investigate the histological characteristics of the capsular attachment on the anterosuperior femoral head-neck junction, particularly focusing on the presence or absence of continuity of the joint capsule to the articular cartilage. A total of 21 anterosuperior regions (seven hips each for the 12:00, 1:30, and 3:00 positions) from seven hips (three males and four females; mean age at death, 68.7 years) were histologically analyzed in this study for quantitative evaluation of the capsular thickness using histological sections stained with Masson's trichrome, as well as qualitative evaluation of the capsular attachment. The present study showed that the joint capsule, which folded proximally to the femoral head-neck junction from the recess, exhibited a blend of the fibrous and synovial regions. Notably, it not only continued with the superficial layer of the articular cartilage, but also attached to the articular cartilage via the fibrocartilage. This continuous region was relatively fibrous with dense connective tissue running in the longitudinal direction. The capsular thickness at the recess point (mean, 1.7 ± 0.9 mm) and those at the distal end of the articular cartilage (0.35 ± 0.16 mm) were significantly greater than the control value for the most superficial layer thickness of the articular cartilage (0.019 ± 0.003 mm) (Dunnett's T3, both p-value <0.001). Based on the fibrous continuity between the joint capsule and articular cartilage and its thickness, this study suggests the anatomical possibility that some mechanical stress can be transmitted from the joint capsule to the articular cartilage at the frequent sites of cam morphology.

Project description:Hip arthroscopy is one of the most rapidly growing fields in orthopaedic surgery. One of the most frequent pathologies treated with hip arthroscopy remains femoroacetabular impingement, which is addressed by labral repair and femoral osteoplasty. The most commonly cited reason for failure of arthroscopic treatment of femoroacetabular impingement is under-resection of the cam lesion. Surgeons frequently use evaluations of preoperative images, intraoperative fluoroscopy, and dynamic range of motion to ensure adequate resection. In this article, we describe a reproducible and standardized technique to assist in appropriate resection. This is achieved by a 2-tiered resection technique: Tier 1 aims to set the depth of resection and restore the head-neck offset. Tier 2 then matches the depth of the resection set by tier 1 and allows for retention of appropriate transition of the proximal convexity to the distal concavity seen in more ideally shaped femoral heads. With this technique, we offer a tool to avoid under-resection in the area of maximal conflict while simultaneously minimizing the risk of proximal over-resection and thus compromising the fluid seal dynamics of the joint in deeper flexion angles. Technique Video Video 1 Visualization of femoral osteoplasty from distal anterolateral portal. The resection begins with visual inspection and localization of important anatomy including the lateral retinacular vessels. The osteoplasty ensues in a 2-tiered manner. The tier 1 resection is begun 1.5 burr widths distal to the articular surface margin with the goal to create the depth of resection required to re-create the native head-neck offset. This is also confirmed with fluoroscopic imaging from the Dunn lateral view to identify the physeal scar as the proximal extent of the osteoplasty. During the tier 1 resection, the proximal head-neck junction is contoured to achieve sphericity. The tier 2 resection is then begun distal to tier 1 with the goal of matching the depth and resecting the remainder of the cam. Finally, attention is turned back to the head-neck junction with the goal of creating a smooth, spherical head via gentle contouring. During the resection, multiple views through the distal anterolateral portal are used to gather a greater perspective of the resection. At the completion of the procedure, evaluation of dynamic hip range of motion under direct visualization, along with fluoroscopic imaging, is used to ensure adequate resection of the cam lesion.

Dataset Information

The clamshell fracture and adjunctive acetabuloplasty in the arthroscopic osteosynthesis of femoral head fractures with femoroacetabular impingement.

Publications

The clamshell fracture and adjunctive acetabuloplasty in the arthroscopic osteosynthesis of femoral head fractures with femoroacetabular impingement.

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