🔍 Key Findings

From “Long-term follow up of 44 cats undergoing total hip replacement” by Rodiño Tilve et al.

• Slipped capital femoral epiphysis (SCFE) was the most common surgical indication (61%, 34/56 hips), primarily affecting young neutered male cats.
• All THRs used cemented micro/nano BioMedtrix implants; most common femoral stem was size #3, and most common acetabular cup was 12 mm.
• Postoperative complication rate was 19.6% (11/56) with 9 major complications (luxation most common), and no intraoperative complications reported.
• All luxations occurred in hips implanted with femoral neck +0 mm length implants.
• Second luxations were more common when revision used same implant size; use of larger implants reduced reluxation rates.
• FMPI-sf score improved significantly from median 2.111 pre-op to 0.111 post-op (P < .001), indicating reduced pain and improved function.
• Very high owner satisfaction: 91% (30/33) reported outcome as "very good."
• No significant associations found between complications and variables like weight, sex, implant size, or surgical indication.

🔍 Key Findings Summary

• 5 juvenile dogs (mean age 7.2 months) with grade III–IV MPL were treated surgically.
• Most had femoral varus + external tibial torsion; some had shallow trochlear grooves.
• Distal femoral osteotomy was performed in 4/5 dogs; Tibial tuberosity transposition (TTT) in 3/5; Sulcoplasty in 2/5.
• Mean time to weight bearing: 9.8 ± 5.5 days; healing: 55 ± 24 days
• No reluxations, and final radiographic values for aLDFA and torsion were maintained at 1 year.
• One complication due to domestic trauma, not surgical failure.
• Early surgery appeared to preserve alignment and prevent deformity progression.

🔍 Key Findings

Internal fixation (IF) group (n=59):

• Complication rate: 20.3%
• Major complications: 15.3%
• Longer time to discharge if complications occurred (median: 12.5 weeks)

External skeletal fixation (ESF) group (n=36):

• Complication rate: 55.6% (p < .001 vs IF)
• Major complications: 52.8%
• Most common issue: pin tract morbidity

Multivariable analysis:

• Use of IF significantly reduced odds of complications (OR 0.23, p = .004)
• Use of post-op antibiotics associated with increased odds of complications (OR 3.53, p = .028)

Fixation choice influenced by age:

• Older puppies more likely to receive IF (OR 1.25 per week increase in age, p < .001)

Breed & fracture distribution:

• Common breeds: Labrador, Border Collie, Whippet
• Common fracture sites: middle and proximal third of tibia

🔍 Key Findings

• CBLO was effective for stifle stabilization in skeletally immature dogs with CrCL injuries, avoiding disruption of proximal tibial growth plates.
• Radiographic union of the osteotomy occurred in a mean of 6 weeks (range: 4–8 weeks), indicating rapid bone healing.
• Full limb function was restored in all cases by long-term follow-up (mean 23 months), including dogs with initial complications.
• Two dogs developed 19° valgus deformities due to screw interference with the proximal tibial physis; both were corrected surgically with return to function.
• One dog developed 10° recurvatum due to over-rotation of the tibial plateau, but retained full function without revision.
• CCS (countersink compression screw) caused early apophyseal closure in older dogs but had no adverse clinical effects.
• In contrast, K-wire or plate-only fixation preserved open apophysis, suggesting implant choice may influence growth.
• No meniscal injuries were observed, and all CrCL injuries were managed arthroscopically — 6 complete, 6 partial, 4 avulsions.

🔍 Key Findings

Population: 9 dogs underwent revision of osteointegrated acetabular cups after total hip arthroplasty (THA)

Revision Indications:

• 7 luxations (5 ventral, 2 craniodorsal)
• 1 femoral stem fracture
• 1 aseptic stem loosening

Implants:

• 8 BFX cups, 1 Helica; all revised to BFX
• 7/9 required a larger cup than original

Cup removal: Required sectioning with a high-speed burr and modular osteotome; removal fragments extracted

Complications:

• 1 recurrent luxation
• 1 low-grade infection with possible metallic debris-associated osteolysis
• 2 femoral fissures managed intraoperatively

Outcomes:

• Good to excellent function in 6/6 dogs available at median 621 days
• Minimal complications with success in re-osteointegration of new cup

Clinical takeaway: Revision of stable, ingrown cups is feasible and offers an alternative to pelvic osteotomies; typically requires upsizing

🔍 Key Findings

Incidence of BFX lateral bolt stem breakage: 2.95% (13 dogs, 14 stems)

Implant factors:

• 13/14 were BFX lateral bolt stems (sizes #5–7)
• +9 necks used in 5/11 of 17 mm heads
• 10/14 stems undersized based on radiographs
• 10/13 dogs exceeded weight limits for implanted stem size

Malalignment:

• 10/14 had varus alignment (median 3.9°)
• 8/14 had insufficient proximodistal seating

Breakage site: Proximolateral shoulder in all cases

Revision outcomes:

• 11 revised (7 CFX, 3 larger BFX, 1 collared)
• 9/10 revised dogs regained full function
• Complications: 1 rebreakage, 1 periprosthetic fracture, 1 fixation failure

Histopathology:

• Electron microscopy showed fatigue striations and incomplete bead fusion

Conclusion: Avoid small BFX lateral bolt stems if undersized or if long necks required; use weight guidelines to prevent fatigue failure.

🔍 Key Findings

• Luxoid hip dysplasia (LH) was present in 8% of THA cases and significantly increased risk of major complications (p < .001).
• Intraoperative fissures/fractures were 3x more likely in LH dogs vs non-LH (39% vs 16%, p = .001).
• Dorsal luxation was more frequent in LH dogs (28% vs 4%, p = .019).
• Acetabular cup placement with ALO >35° was associated with luxation in LH dogs.
• Morphologic abnormalities (e.g., femoral valgus, lateralization/medialization of cortices) were common in LH and may complicate implantation.
• Despite higher risk, 94% of LH dogs achieved satisfactory outcomes after appropriate revisions.
• Younger age and lighter weight characterized LH dogs (mean age 14.7 months vs 40.9 months, p < .001).
• All LH dogs were treated with cementless stems; prophylactic cerclage was rarely used.

🔍 Key Findings

• TPLO with the contoured saw guide achieved more accurate osteotomy angles for both inclination and torsion in bone models and cadaveric limbs (p < .05).
• Medial cortical damage was significantly lower with the contoured guide (247 vs. 1866 pixels in bone models; p < .001).
• No significant difference in eccentricity (distance between actual and intended osteotomy center) was found between groups.
• Postoperative tibial plateau angle (TPA) was similar between groups (6.4° vs. 7.6°; p = .15), though both were slightly higher than the target of 6°.
• Deviation in medial mechanical proximal tibial angle (mMPTA) showed no significant group difference; valgus deformity occurred in both.
• Osteotomy and device application times were similar between the contoured guide and jig-assisted TPLO.
• The contoured guide eliminated the need for proximal jig pin, potentially reducing intra-articular pin risk.
• The guide's multiple pin fixation system improved stability and alignment, supporting safer osteotomy on curved tibial surfaces.

🔍 Key Findings

• Combined CBLO-TTT did not reduce load to failure compared to CBLO or TTT alone (P = .81 and P = .12, respectively).
• CBLO-TTT maintains construct strength without significant compromise compared to individual procedures.
• Most common failure mode in CBLO-TTT was displacement of the tibial crest segment with k-wire pullout and tension band untwisting.
• No fulcrum effect was seen in CBLO-TTT, unlike TPLO-TTT combinations, likely due to preservation of buttress effect.
• Patellar ligament avulsion occurred in both CBLO and CBLO-TTT, but not as a clinical concern — possibly artifact from cadaver model.
• Load-to-failure testing was static and unidirectional, not accounting for cyclic fatigue or in vivo healing.
• Plate size and saw blade variation were based on clinical realism, introducing potential variability but not affecting outcomes.
• Study suggests feasibility of simultaneous surgical correction of CCL rupture and MPL using CBLO-TTT in dogs.