The Transverse Infrapatellar View: A New Ultrasound Technique to Measure Distal Femoral Cartilage Thickness.

OBJECTIVES: To examine the reliability and face validity of ultrasound (US) measurements of distal femoral cartilage thickness (CT) using the infrapatellar view (IPV) with knee extension compared to the traditional suprapatellar view (SPV) with knee hyperflexion in young asymptomatic participants and patients with painful knee osteoarthritis (KOA). METHODS: The IPV was obtained in an extended knee position by placing the US transducer on the patellar tendon at a 60° angle tilted toward the distal femoral condyle in 19 young adults (control group) and 70 patients with KOA. The CT was measured at the medial femoral condyle, the intercondylar notch, and the lateral femoral condyle. RESULTS: The inter-rater intraclass correlation coefficient was higher for IPV-based CT measurement (range, 0.856-0.858) compared to SPV-based CT measurement (range, 0.315-0.523) among the patients with symptomatic KOA. The IPV-based CT differed significantly between the control group and the KOA group at the intercondylar notch (P < .001) and lateral femoral condyle (P = .006). The SPV-based CT differed significantly between the control group and the KOA group only at the lateral femoral condyle region (P = .014). CONCLUSIONS: An infrapatellar US evaluation of the distal femoral CT can be a reliable alternative method to a suprapatellar US evaluation for patients with KOA.

Localization of Hand and Wrist Anatomic Structures Among Physical Medicine and Rehabilitation Residents: Implication of Ultrasonography in Palpation Skill Verification.

Objective: The objective of this cross-sectional study is to evaluate the accuracy of physical medicine and rehabilitation (PM&R) resident palpation skills of hand and wrist joint and soft tissue structures using ultrasonography (US) verification. Methods: PM&R residents palpated hand and wrist anatomic structures in an outpatient musculoskeletal (MSK) clinic. Once the presumed structures were localized, residents marked a one centimeter size circle on the overlying skin with an ink marker. The accuracy of the circle over the joint line and soft tissue structures was verified using US. Results: Overall palpation accuracy for 16 joint line and soft tissue structures was 40.6%. There was no significant difference in palpation accuracy with advanced educational level (37.5% in PGY-2, 33.8% in PGY-3, 50% in PGY-4, p = 0.12). The percentage of combined accurate palpation and less than one centimeter error in accurate palpation revealed a significant improvement along the advancement of PGY training (50%, 61.3%, 69.8% in PGY-2, 3, 4 respectively, p = 0.01). Conclusions: This study demonstrated an overall suboptimal accuracy of hand and wrist palpation skills by PM&R residents and a need to improve palpation skills among PM&R residents.

Adipose Tissue as Pain Generator in the Lower Back and Lower Extremity: Application in Musculoskeletal Medicine.

Description Adipose tissue (AT) has diverse and important functions in body insulation, mechanical protection, energy metabolism and the endocrine system. Despite its relative abundance in the human body, the clinical significance of AT in musculoskeletal (MSK) medicine, particularly its role in painful MSK conditions, is under-recognized. Pain associated with AT can be divided into intrinsic (AT as a primary pain generator), extrinsic (AT as a secondary pain generator) or mixed origin. Understanding AT as an MSK pain generator, both by mechanism and its specific role in pain generation by body region, enhances the clinical decision-making process and guides therapeutic strategies in patients with AT-related MSK disorders. This article reviews the existing literature of AT in the context of pain generation in the lower back and lower extremity to increase clinician awareness and stimulate further investigation into AT in MSK medicine.

Evaluation of Resident Palpation Skills in Foot and Ankle Anatomic Structures Using Bedside Ultrasound.

Objective: The objective is to determine the accuracy of foot and ankle joint and soft tissue structure palpation in Physical Medicine and Rehabilitation (PM&R) residents using ultrasonography (US) verification. Methods: PM&R residents were tested in an outpatient musculoskeletal (MSK) clinic on palpated foot and ankle anatomic structures in a human model. Once the presumed structures were localized, residents marked a 1 cm size circle on the overlying skin with a ink marker. The accuracy of the circle over the joint line and soft tissue structures was verified using US. Results: The overall palpation accuracy for 22 joint line and soft tissue structures was 38.0%. Accuracy by foot and ankle region, including the posterior, medial, lateral, plantar, and dorsal were 72.9%, 47.5%, 42.5%, 35% and 7.8% respectively. There was a positive trend with level of education without a statistically significant difference in palpation accuracy (30.4% in PGY-2, 38.3% in PGY-3, 44.2% in PGY-4, p = 0.11). Conclusions: Residents in this study demonstrated suboptimal accuracy of foot and ankle anatomic structure identification by palpation. US may be a useful adjunctive tool to advance current methods of teaching musculoskeletal examination skills to PM&R residents.