Search

Objective To compare structural findings between US, micro-CT (µCT) and histology in people with OA of the hands. Methods We analysed DIP and PIP joints of 31 fingers from 15 dissecting-room cadavers with OA of the hands. The occurrence of bone erosions and osteophytes were recorded by US, µCT and histology at 16 regions for each joint and compared for each method. Results In total, US (n  = 558, 56.2% of 992 examined regions) and µCT (n  = 493, 49.7%) detected a higher frequency of osteophytes at PIP and DIP joints than histology (n  = 161, 23.4% of 689 histological examined regions; P  = 0.01). We found a comparable number of erosions with each method [US, n  = 52 (5.2%); µCT, n  = 43 (4.3%); histology, n  = 35 (5.2%)]. Both imaging techniques correlated moderately with each other regarding the detection of osteophytes (r  = 0.54, P  = 0.002) and erosions (r  = 0.43, P  = 0.017). Neither US nor µCT correlated with histology regarding erosions or osteophytes. With histology as the reference, US had a sensitivity of 80% and a specificity of 32% to detect osteophytes, whereas µCT had a sensitivity of 73% and a specificity of 27%. For erosions, sensitivities (US 10% and µCT 6%, respectively) were much lower. Microscopically, erosions contained fibrous myxoid tissue extending from subcortical cavities through the breach of cortical bone. Conclusions The ability of US to identify osteophytes was comparable to that of µCT, yielding a good sensitivity when histology was used as the gold standard. The sensitivity of US and µCT to detecting erosions was low compared with histology. [ABSTRACT FROM AUTHOR]

Osteosynthesis of metacarpal and phalangeal fractures with headless compression screws leads to a defect in the articular surface and possibly damage to the extensor tendons. This study aimed to quantify the articular surface defect and extensor tendon injuries after implant placement in cadaveric hands. Defect size was assessed with computed tomography. Extensor tendon injuries were assessed by direct visualization and measurement after dissection. In the middle phalanx, the defect size in relation to the joint surface was significantly smaller after anterograde screw placement when compared with retrograde placement. Also, a mini-open approach was found to cause significantly less tendon injury than a percutaneous approach, but there was no difference in tendon damage between retrograde and antegrade screw insertion into the middle phalanx.